The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Kwon Kim - One of the best experts on this subject based on the ideXlab platform.
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Enhanced Magnon-Photon Coupling at the Angular Momentum Compensation Point of Ferrimagnets
Physical review letters, 2020Co-Authors: Jaechul Shim, Seok-jong Kim, Kwon Kim, Kyung-jin LeeAbstract:We theoretically show that the coupling between magnons in an antiferromagnetically coupled ferrimagnet and microwave photons in a cavity is largely enhanced at the angular momentum compensation point (${T}_{A}$) when ${T}_{A}$ is distinct from the magnetization compensation point. The origin of the enhanced magnon-photon coupling at ${T}_{A}$ is identified as the antiferromagnetic spin dynamics combined with a finite magnetization. Moreover, we show that strong magnon-photon coupling can be achieved at high excitation frequency in a ferrimagnet, which is challenging to achieve for a ferromagnet due to low magnon frequency and for an antiferromagnet due to weak magnon-photon coupling. Our results will invigorate research on magnon-photon coupling by proposing Ferrimagnets as a versatile platform that offers advantages of both ferromagnets and antiferromagnets.
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Distinct handedness of spin wave across the compensation temperatures of Ferrimagnets
Nature materials, 2020Co-Authors: Changsoo Kim, Kyung-jin Lee, Soogil Lee, Hyun Gyu Kim, Ji-ho Park, Kyung Woong Moon, Jae Yeol Park, Jong Min Yuk, Byong-guk Park, Kwon KimAbstract:Antiferromagnetic spin waves have been predicted to offer substantial functionalities for magnonic applications due to the existence of two distinct polarizations, the right-handed and left-handed modes, as well as their ultrafast dynamics. However, experimental investigations have been hampered by the field-immunity of antiferromagnets. Ferrimagnets have been shown to be an alternative platform to study antiferromagnetic spin dynamics. Here we investigate thermally excited spin waves in Ferrimagnets across the magnetization compensation and angular momentum compensation temperatures using Brillouin light scattering. Our results show that right-handed and left-handed modes intersect at the angular momentum compensation temperature where pure antiferromagnetic spin waves are expected. A field-induced shift of the mode-crossing point from the angular momentum compensation temperature and the gyromagnetic reversal reveal hitherto unrecognized properties of ferrimagnetic dynamics. We also provide a theoretical understanding of our experimental results. Our work demonstrates important aspects of the physics of ferrimagnetic spin waves and opens up the attractive possibility of ferrimagnet-based magnonic devices.
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The dynamics of a domain wall in Ferrimagnets driven by spin-transfer torque
Journal of Magnetism and Magnetic Materials, 2020Co-Authors: Dong-hyun Kim, Kabjin Kim, Kyung-jin Lee, Duck-ho Kim, Kyoung Woong Moon, Seungmo Yang, Kwon KimAbstract:Abstract The spin-transfer-torque-driven (STT-driven) dynamics of a domain wall in an easy-axis rare-earth transition-metal ferrimagnet is investigated theoretically and numerically in the vicinity of the angular momentum compensation point T A , where the net spin density vanishes. The particular focus is given on the unusual interaction of the antiferromagnetic dynamics of a ferrimagnetic domain wall and the adiabatic component of STT, which is absent in antiferromagnets but exists in the Ferrimagnets due to the dominant coupling of conduction electrons to transition-metal spins. Specifically, we first show that the STT-induced domain-wall velocity changes its sign across T A due to the sign change of the net spin density, giving rise to a phenomenon unique to Ferrimagnets that can be used to characterize T A electrically. It is also shown that the frequency of the STT-induced domain-wall precession exhibits its maximum at T A and it can approach the spin-wave gap at sufficiently high currents. Lastly, we report a numerical observation that, as the current density increases, the domain-wall velocity starts to deviate from the linear-response result, calling for a more comprehensive theory for the domain-wall dynamics in Ferrimagnets driven by a strong current.
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Tunable Magnonic Thermal Hall Effect in Skyrmion Crystal Phases of Ferrimagnets.
Physical review letters, 2019Co-Authors: Kwon Kim, Kouki Nakata, Daniel Loss, Yaroslav TserkovnyakAbstract:We theoretically study the thermal Hall effect by magnons in skyrmion crystal phases of Ferrimagnets in the vicinity of the angular momentum compensation point ($CP$). To this end, we start by deriving the equation of motion for magnons in the background of an arbitrary equilibrium spin texture, which gives rise to the fictitious electromagnetic field for magnons. As the net spin density varies, the resultant equation of motion interpolates between the relativistic Klein-Gordon equation at the $CP$ and the nonrelativistic Schr\"odinger-like equation away from it. In skyrmion crystal phases, the right- and the left-circularly polarized magnons, with respect to the order parameter, are shown to form the Landau levels separately within the uniform skyrmion-density approximation. For an experimental proposal, we predict that the magnonic thermal Hall conductivity changes its sign when the ferrimagnet is tuned across the $CP$, providing a way to control heat flux in spin-caloritronic devices on the one hand and a feasible way to detect the $CP$ of Ferrimagnets on the other hand.
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Self-focusing skyrmion racetracks in Ferrimagnets
Physical Review B, 2017Co-Authors: Kwon Kim, Kyung-jin Lee, Yaroslav TserkovnyakAbstract:We theoretically study the dynamics of ferrimagnetic skyrmions in inhomogeneous metallic films close to the angular momentum compensation point. In particular, it is shown that the line of the vanishing angular momentum can be utilized as a self-focusing racetrack for skyrmions. To that end, we begin by deriving the equations of motion for the dynamics of collinear Ferrimagnets in the presence of a charge current. The obtained equations of motion reduce to those of ferromagnets and antiferromagnets at two special limits. In the collective coordinate approach, a skyrmion behaves as a massive charged particle moving in a viscous medium subjected to a magnetic field. Analogous to the snake orbits of electrons in a nonuniform magnetic field, we show that a ferrimagnet with the nonuniform angular momentum density can exhibit snake trajectories of skyrmions, which can be utilized as racetracks for skyrmions.Comment: 5 pages, 2 figures, 1 page of supplemental materia
Do Bang - One of the best experts on this subject based on the ideXlab platform.
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long spin coherence length and bulk like spin orbit torque in ferrimagnetic multilayers
Nature Materials, 2019Co-Authors: Do Bang, Rahul Mishra, Rajagopalan Ramaswamy, Hyeon Jong Park, Yunboo Jeong, Pham Van Thach, Dong Kyu Lee, Seo Won LeeAbstract:Spintronics relies on magnetization switching through current-induced spin torques. However, because spin transfer torque for ferromagnets is a surface torque, a large switching current is required for a thick, thermally stable ferromagnetic cell, and this remains a fundamental obstacle for high-density non-volatile applications with ferromagnets. Here, we report a long spin coherence length and associated bulk-like torque characteristics in an antiferromagnetically coupled ferrimagnetic multilayer. We find that a transverse spin current can pass through >10-nm-thick ferrimagnetic Co/Tb multilayers, whereas it is entirely absorbed by a 1-nm-thick ferromagnetic Co/Ni multilayer. We also find that the switching efficiency of Co/Tb multilayers partially reflects a bulk-like torque characteristic, as it increases with ferrimagnet thickness up to 8 nm and then decreases, in clear contrast to the 1/thickness dependence of ferromagnetic Co/Ni multilayers. Our results on antiferromagnetically coupled systems will invigorate research towards the development of energy-efficient spintronics.
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long spin coherence length and bulk like spin orbit torque in ferrimagnetic multilayers
arXiv: Materials Science, 2018Co-Authors: Do Bang, Rahul Mishra, Rajagopalan Ramaswamy, Hyeon Jong Park, Yunboo Jeong, Pham Van Thach, Dong Kyu Lee, Seo Won LeeAbstract:Ferromagnetic spintronics has been a main focus as it offers non-volatile memory and logic applications through current-induced spin-transfer torques. Enabling wider applications of such magnetic devices requires a lower switching current for a smaller cell while keeping the thermal stability of magnetic cells for non-volatility. As the cell size reduces, however, it becomes extremely difficult to meet this requirement with ferromagnets because spin-transfer torque for ferromagnets is a surface torque due to rapid spin dephasing, leading to the 1/ferromagnet-thickness dependence of the spin-torque efficiency. Requirement of a larger switching current for a thicker and thus more thermally stable ferromagnetic cell is the fundamental obstacle for high-density non-volatile applications with ferromagnets. Theories predicted that antiferromagnets have a long spin coherence length due to the staggered spin order on an atomic scale, thereby resolving the above fundamental limitation. Despite several spin-torque experiments on antiferromagnets and ferrimagnetic alloys, this prediction has remained unexplored. Here we report a long spin coherence length and associated bulk-like-torque characteristic in an antiferromagnetically coupled ferrimagnetic multilayer. We find that a transverse spin current can pass through > 10 nm-thick ferrimagnetic Co/Tb multilayers whereas it is entirely absorbed by 1 nm-thick ferromagnetic Co/Ni multilayer. We also find that the switching efficiency of Co/Tb multilayers partially reflects a bulk-like-torque characteristic as it increases with the ferrimagnet-thickness up to 8 nm and then decreases, in clear contrast to 1/thickness-dependence of Co/Ni multilayers. Our results on antiferromagnetically coupled systems will invigorate researches towards energy-efficient spintronic technologies.
Kyung-jin Lee - One of the best experts on this subject based on the ideXlab platform.
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Enhanced Magnon-Photon Coupling at the Angular Momentum Compensation Point of Ferrimagnets
Physical review letters, 2020Co-Authors: Jaechul Shim, Seok-jong Kim, Kwon Kim, Kyung-jin LeeAbstract:We theoretically show that the coupling between magnons in an antiferromagnetically coupled ferrimagnet and microwave photons in a cavity is largely enhanced at the angular momentum compensation point (${T}_{A}$) when ${T}_{A}$ is distinct from the magnetization compensation point. The origin of the enhanced magnon-photon coupling at ${T}_{A}$ is identified as the antiferromagnetic spin dynamics combined with a finite magnetization. Moreover, we show that strong magnon-photon coupling can be achieved at high excitation frequency in a ferrimagnet, which is challenging to achieve for a ferromagnet due to low magnon frequency and for an antiferromagnet due to weak magnon-photon coupling. Our results will invigorate research on magnon-photon coupling by proposing Ferrimagnets as a versatile platform that offers advantages of both ferromagnets and antiferromagnets.
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Distinct handedness of spin wave across the compensation temperatures of Ferrimagnets
Nature materials, 2020Co-Authors: Changsoo Kim, Kyung-jin Lee, Soogil Lee, Hyun Gyu Kim, Ji-ho Park, Kyung Woong Moon, Jae Yeol Park, Jong Min Yuk, Byong-guk Park, Kwon KimAbstract:Antiferromagnetic spin waves have been predicted to offer substantial functionalities for magnonic applications due to the existence of two distinct polarizations, the right-handed and left-handed modes, as well as their ultrafast dynamics. However, experimental investigations have been hampered by the field-immunity of antiferromagnets. Ferrimagnets have been shown to be an alternative platform to study antiferromagnetic spin dynamics. Here we investigate thermally excited spin waves in Ferrimagnets across the magnetization compensation and angular momentum compensation temperatures using Brillouin light scattering. Our results show that right-handed and left-handed modes intersect at the angular momentum compensation temperature where pure antiferromagnetic spin waves are expected. A field-induced shift of the mode-crossing point from the angular momentum compensation temperature and the gyromagnetic reversal reveal hitherto unrecognized properties of ferrimagnetic dynamics. We also provide a theoretical understanding of our experimental results. Our work demonstrates important aspects of the physics of ferrimagnetic spin waves and opens up the attractive possibility of ferrimagnet-based magnonic devices.
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The dynamics of a domain wall in Ferrimagnets driven by spin-transfer torque
Journal of Magnetism and Magnetic Materials, 2020Co-Authors: Dong-hyun Kim, Kabjin Kim, Kyung-jin Lee, Duck-ho Kim, Kyoung Woong Moon, Seungmo Yang, Kwon KimAbstract:Abstract The spin-transfer-torque-driven (STT-driven) dynamics of a domain wall in an easy-axis rare-earth transition-metal ferrimagnet is investigated theoretically and numerically in the vicinity of the angular momentum compensation point T A , where the net spin density vanishes. The particular focus is given on the unusual interaction of the antiferromagnetic dynamics of a ferrimagnetic domain wall and the adiabatic component of STT, which is absent in antiferromagnets but exists in the Ferrimagnets due to the dominant coupling of conduction electrons to transition-metal spins. Specifically, we first show that the STT-induced domain-wall velocity changes its sign across T A due to the sign change of the net spin density, giving rise to a phenomenon unique to Ferrimagnets that can be used to characterize T A electrically. It is also shown that the frequency of the STT-induced domain-wall precession exhibits its maximum at T A and it can approach the spin-wave gap at sufficiently high currents. Lastly, we report a numerical observation that, as the current density increases, the domain-wall velocity starts to deviate from the linear-response result, calling for a more comprehensive theory for the domain-wall dynamics in Ferrimagnets driven by a strong current.
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Laser-induced antiferromagnetic-like resonance in amorphous Ferrimagnets
arXiv: Materials Science, 2018Co-Authors: Shigemi Mizukami, Dong Kyu Lee, Kyung-jin Lee, Y. Sasaki, Hiroki Yoshikawa, Arata Tsukamoto, Teruo OnoAbstract:The magnetization dynamics for Ferrimagnets at the angular momentum compensation temperature T_A is believed to be analogous to that for antiferromagnets. We investigated the pulsed-laser-induced magnetization dynamics in amorphous rare-earth transition-metal ferrimagnet films with a T_A just above room temperature. For a low pulse fluence, the magnetization precession frequency decreases as the applied magnetic field increases, whereas for a higher pulse fluence, it increases as the applied field increases. The result was well explained by the left-handed and right-handed precession modes of the antiferromagnetic-like resonance at temperatures below and above T_A, respectively, and the data were in agreement with the theoretical simulation. The study demonstrated the experimental route to achieving antiferromagnetic resonance in Ferrimagnets using a pulsed laser.
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Self-focusing skyrmion racetracks in Ferrimagnets
Physical Review B, 2017Co-Authors: Kwon Kim, Kyung-jin Lee, Yaroslav TserkovnyakAbstract:We theoretically study the dynamics of ferrimagnetic skyrmions in inhomogeneous metallic films close to the angular momentum compensation point. In particular, it is shown that the line of the vanishing angular momentum can be utilized as a self-focusing racetrack for skyrmions. To that end, we begin by deriving the equations of motion for the dynamics of collinear Ferrimagnets in the presence of a charge current. The obtained equations of motion reduce to those of ferromagnets and antiferromagnets at two special limits. In the collective coordinate approach, a skyrmion behaves as a massive charged particle moving in a viscous medium subjected to a magnetic field. Analogous to the snake orbits of electrons in a nonuniform magnetic field, we show that a ferrimagnet with the nonuniform angular momentum density can exhibit snake trajectories of skyrmions, which can be utilized as racetracks for skyrmions.Comment: 5 pages, 2 figures, 1 page of supplemental materia
A Tsukamoto - One of the best experts on this subject based on the ideXlab platform.
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pathways for single shot all optical switching of magnetization in Ferrimagnets
Physical review applied, 2020Co-Authors: C S Davies, A Tsukamoto, T Janssen, J H Mentink, A V Kimel, A F G Van Der Meer, A Stupakiewicz, Andrei KirilyukAbstract:Single-shot helicity-independent all-optical switching of magnetization in Ferrimagnets represents the fastest known approach for deterministic data recording. Recently, it was shown that 15-ps-long optical pulses could suffice in triggering the magnetic switching in certain $\mathrm{Gd}\text{\ensuremath{-}}\mathrm{Fe}\text{\ensuremath{-}}\mathrm{Co}$ alloys, generating enormous controversy about the underlying mechanism. Here, we demonstrate how the exact composition of the ferrimagnet affects the kinetics of the reversal process and facilitates the use of thermal pulses with a duration spanning all relevant timescales within the nonadiabatic limit. By modelling a generic ferrimagnet as two coupled macrospins, we show that the magnetization reversal can occur via distinctly different pathways, depending on the duration of the heater. We experimentally reveal that pulses with a duration below and above a critical pulse width respectively enable and disable the capability of all-optical magnetization switching in $\mathrm{Gd}\text{\ensuremath{-}}\mathrm{Fe}\text{\ensuremath{-}}\mathrm{Co}$ alloys, and that modest change of the alloy composition leads to drastic variation of the critical pulse width, by almost 2 orders of magnitude. Our interpretation and results resolve an urgent and outstanding technologically relevant controversy, and provide crucial but previously overlooked guidelines for how to engineer deterministic all-optical switching of magnetization in suitable Ferrimagnets.
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high field anomalies of equilibrium and ultrafast magnetism in rare earth transition metal Ferrimagnets
Physical Review B, 2019Co-Authors: A Tsukamoto, A. K. Zvezdin, Andrei Kirilyuk, A Pogrebna, K H Prabhakara, Margarita N Davydova, J Becker, Th RasingAbstract:Magneto-optical spectroscopy in fields up to 30 T reveals anomalies in the equilibrium and ultrafast magnetic properties of the ferrimagnetic rare-earth--transition-metal alloy TbFeCo. In particular, near the magnetization compensation temperature, each of the magnetizations of the antiferromagnetically coupled Tb and FeCo sublattices show triple hysteresis loops. Contrary to state-of-the-art theory, which explains such loops by sample inhomogeneities, here we show that they are an intrinsic property of the rare-earth Ferrimagnets. Assuming that the rare-earth ions are paramagnetic and have a nonzero orbital momentum in the ground state and, therefore, a large magnetic anisotropy, we are able to reproduce the experimentally observed behavior in equilibrium. The same theory is also able to describe the experimentally observed critical slowdown of the spin dynamics near the magnetization compensation temperature, emphasizing the role played by the orbital momentum in static and ultrafast magnetism of Ferrimagnets.
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spin transfer torques for domain wall motion in antiferromagnetically coupled Ferrimagnets
Nature Electronics, 2019Co-Authors: Takaya Okuno, Se Kwon Kim, Woo Seung Ham, Yuushou Hirata, Hiroki Yoshikawa, Duck-ho Kim, Tomoe Nishimura, Yasuhiro Futakawa, A TsukamotoAbstract:Antiferromagnetic materials offer ultrafast spin dynamics and could be used to build devices that are orders of magnitude faster than those based on ferromagnetic materials. Spin-transfer torque is key to the electrical control of spins and has been demonstrated in ferromagnetic spintronics. However, experimental exploration of spin-transfer torque in antiferromagnets remains limited, despite a number of theoretical studies. Here, we report an experimental examination of the effects of spin-transfer torque on the motion of domain walls in antiferromagnetically coupled Ferrimagnets. Using a ferrimagnetic gadolinium–iron–cobalt (GdFeCo) alloy in which Gd and FeCo moments are coupled antiferromagnetically, we find that non-adiabatic spin-transfer torque acts like a staggered magnetic field, providing efficient control of the domain walls. We also show that the non-adiabaticity parameter of the spin-transfer torque is significantly larger than the Gilbert damping parameter, in contrast to the case of non-adiabatic spin-transfer torque in ferromagnets. Non-adiabatic spin-transfer torque in antiferromagnetically coupled Ferrimagnets acts like a staggered magnetic field and can induce efficient domain wall motion.
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spin transfer torques for domain walls in antiferromagnetically coupled Ferrimagnets
arXiv: Materials Science, 2019Co-Authors: Takaya Okuno, Se Kwon Kim, Woo Seung Ham, Yuushou Hirata, A Tsukamoto, Hiroki Yoshikawa, Duck-ho Kim, Tomoe Nishimura, Yasuhiro Futakawa, Yaroslav TserkovnyakAbstract:Antiferromagnetic materials are outstanding candidates for next generation spintronic applications, because their ultrafast spin dynamics makes it possible to realize several orders of magnitude higher-speed devices than conventional ferromagnetic materials1. Though spin-transfer torque (STT) is a key for electrical control of spins as successfully demonstrated in ferromagnetic spintronics, experimental understanding of STT in antiferromagnets has been still lacking despite a number of pertinent theoretical studies2-5. Here, we report experimental results on the effects of STT on domain-wall (DW) motion in antiferromagnetically-coupled Ferrimagnets. We find that non-adiabatic STT acts like a staggered magnetic field and thus can drive DWs effectively. Moreover, the non-adiabaticity parameter {\beta} of STT is found to be significantly larger than the Gilbert damping parameter {\alpha}, challenging our conventional understanding of the non-adiabatic STT based on ferromagnets as well as leading to fast current-induced antiferromagnetic DW motion. Our study will lead to further vigorous exploration of STT for antiferromagnetic spin textures for fundamental physics on spin-charge interaction as wells for efficient electrical control of antiferromagnetic devices.
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correlation between compensation temperatures of magnetization and angular momentum in gdfeco Ferrimagnets
Physical Review B, 2018Co-Authors: Yuushou Hirata, Kabjin Kim, Takaya Okuno, A Tsukamoto, Hiroki Yoshikawa, Duck-ho Kim, Tomoe Nishimura, Yasuhiro Futakawa, Daeyun Kim, Sugbong ChoeAbstract:Determining the angular momentum compensation temperature of Ferrimagnets is an important step towards ferrimagnetic spintronics, but it is not generally easy to achieve it experimentally. We propose a way to estimate the angular momentum compensation temperature of Ferrimagnets without a dynamical characterization technique. We derive a simple equation that relates the magnetization compensation temperature, the Curie temperature, and the angular momentum compensation temperature based on the critical exponent approximation. We show that the derived equation can explain our experimental results and can be used to estimate the angular momentum compensation temperature from the temperature dependence of magnetization.
Gengchiau Liang - One of the best experts on this subject based on the ideXlab platform.
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ultrafast and energy efficient spin orbit torque switching in compensated Ferrimagnets
Nature Electronics, 2020Co-Authors: Kaiming Cai, Rahul Mishra, Zhifeng Zhu, Jong Min Lee, Lizhu Ren, Shawn D Pollard, Gengchiau Liang, K L Teo, Hyunsoo YangAbstract:Spin–orbit torque can be used to manipulate magnetization in spintronic devices. However, conventional ferromagnetic spin–orbit torque systems have intrinsic limitations in terms of operation speed due to their inherent magnetization dynamics. Antiferromagnets and Ferrimagnets with antiparallel exchange coupling exhibit faster spin dynamics and could potentially overcome these limitations. Here, we report ultrafast spin–orbit torque-induced magnetization switching in ferrimagnetic cobalt-gadolinium (CoGd) alloy devices. Using a stroboscopic pump–probe technique to perform time-resolved measurements, we show that the switching time in the Ferrimagnets can be reduced to the subnanosecond regime and a domain wall velocity of 5.7 km s‒1 can be achieved, which is in agreement with analytical modelling and atomistic spin simulations. We also find that the switching energy efficiency in the Ferrimagnets is one to two orders of magnitude higher than that of ferromagnets. Time-resolved measurements show that current-induced magnetization switching in ferrimagnetic devices is faster and more energy-efficient than in ferromagnet devices.
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Damping-like spin-orbit-torque-induced magnetization dynamics in Ferrimagnets based on Landau-Lifshitz-Bloch equation
Journal of Applied Physics, 2018Co-Authors: Zhifeng Zhu, Xuanyao Fong, Gengchiau LiangAbstract:A theoretical model based on the Landau-Lifshitz-Bloch equation is developed to study the spin-torque effect in Ferrimagnets. Experimental findings, such as the temperature dependence, the peak in spin torque, and the angular-momentum compensation, can be well captured. In contrast to the ferromagnet system, the switching trajectory in Ferrimagnets is found to be precession free. The two sublattices are not always collinear, which produces large exchange field affecting the magnetization dynamics. The study of material composition shows the existence of an oscillation region at intermediate current density, induced by the nondeterministic switching. Compared to the Landau-Lifshitz-Gilbert model, our developed model based on the Landau-Lifshitz-Bloch equation enables the systematic study of spin-torque effect and the evaluation of ferrimagnet-based devices.
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damping like spin orbit torque induced magnetization dynamics in Ferrimagnets based on landau lifshitz bloch equation
Journal of Applied Physics, 2018Co-Authors: Zhifeng Zhu, Xuanyao Fong, Gengchiau LiangAbstract:A theoretical model based on the Landau-Lifshitz-Bloch equation is developed to study the effect of damping-like spin-orbit torque in Ferrimagnets, which can capture many experimental findings. For example, the sample changes from Gd to FeCo dominate by increasing temperature, the damping-like spin-orbit torque has a peak at the magnetization compensation temperature, and angular-momentum compensation temperature increases as a function of Gd concentration. In contrast to the ferromagnet system, the switching trajectory in Ferrimagnets is found to be precession free. The two sublattices are not always collinear, which produce a large exchange field affecting the magnetization dynamics. The study of material composition shows the existence of an oscillation region at intermediate current density, induced by the nondeterministic switching. Compared to the Landau-Lifshitz-Gilbert model, our developed model based on the Landau-Lifshitz-Bloch equation enables the systematic study of the spin-torque effect and the evaluation of ferrimagnet-based devices.A theoretical model based on the Landau-Lifshitz-Bloch equation is developed to study the effect of damping-like spin-orbit torque in Ferrimagnets, which can capture many experimental findings. For example, the sample changes from Gd to FeCo dominate by increasing temperature, the damping-like spin-orbit torque has a peak at the magnetization compensation temperature, and angular-momentum compensation temperature increases as a function of Gd concentration. In contrast to the ferromagnet system, the switching trajectory in Ferrimagnets is found to be precession free. The two sublattices are not always collinear, which produce a large exchange field affecting the magnetization dynamics. The study of material composition shows the existence of an oscillation region at intermediate current density, induced by the nondeterministic switching. Compared to the Landau-Lifshitz-Gilbert model, our developed model based on the Landau-Lifshitz-Bloch equation enables the systematic study of the spin-torque effect and ...