The Experts below are selected from a list of 64446 Experts worldwide ranked by ideXlab platform
Nobuo Hayashi - One of the best experts on this subject based on the ideXlab platform.
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influence of longitudinal bias field on magnetization distribution in magnetoresistive head with shield Films
Journal of Applied Physics, 1994Co-Authors: Chiaki Ishikawa, Yutaka Sugita, Kaori Suzuki, Kazuetsu Yoshida, K Shinagawa, Yoshinobu Nakatani, Nobuo HayashiAbstract:The magnetization distribution in the magnetoresistive (MR) Film has been calculated by self‐consistently solving the three‐dimensional field of the MR head. The magnetization distribution was calculated based on the Landau–Lifshitz–Gilbert equation and the head field was obtained by the Maxwell equation. The longitudinal bias field for the domain control was generated by exchange‐coupled antiferroMagnetic or permanent Magnetic Films which were formed outside the sensing region of the MR Film. The resistance change of the MR Film was calculated from the magnetization distribution with shield Films and without shield Films. It was found that the resistance change with the antiferroMagnetic Film without the shields was about two times larger than that with the permanent Magnetic Film with the remanence Br of 0.7 T. The difference between them was reduced when the shields were formed because the stray field from the permanent Magnetic Film which is applied to the MR Film was decreased by the shields. Further...
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simulation of magnetization distribution in magnetoresistive Film under a longitudinal bias field
Journal of Applied Physics, 1993Co-Authors: Chiaki Ishikawa, Yutaka Sugita, Kaori Suzuki, Naoki Koyama, Kazuetsu Yoshida, K Shinagawa, Yoshinobu Nakatani, Nobuo HayashiAbstract:The effects of longitudinal bias field, used for domain control on the magnetization distribution in a magnetoresistive (MR) Film, have been investigated by computer simulation. The longitudinal bias field was generated by an exchange‐coupled antiferroMagnetic or permanent Magnetic Film formed on the MR Film outside the sensing region. It was assumed that the magnetization in the part of the MR Film on which the bias‐generating Films were formed was fixed along the easy axis. The spatial sensitivity of the MR Film along the track width was evaluated by calculating the dependence of the resistance change on the position of a narrow track recording medium. It was found that the resistance change in the MR Film with the anti‐ferroMagnetic Film was roughly twice as large as the change in the Film with the permanent Magnetic Film. The asymmetric sensitivity profile with respect to reflection about the track width mid‐plane was also obtained. The asymmetry in the track sensitivity profile was found to be caused by three factors: asymmetric magnetization distribution about the track width mid‐plane due to the transverse bias field, the difference in angular changes in the magnetization direction in the left and right regions facing the recording medium, and anisotropic flux propagation in the MR Film.
G Bauer - One of the best experts on this subject based on the ideXlab platform.
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non reciprocal pumping of surface acoustic waves by spin wave resonance
Journal of the Physical Society of Japan, 2020Co-Authors: Jorge Puebla, Kei Yamamoto, Sadamichi Maekawa, G BauerAbstract:We predict that surface acoustic waves are generated preferentially in one direction in a heterostructure of a thin Magnetic Film on a non-Magnetic substrate. The non-reciprocity arises from magnet...
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damping of magnetization dynamics by phonon pumping
Physical Review Letters, 2018Co-Authors: Simon Streib, Hedyeh Keshtgar, G BauerAbstract:We theoretically investigate pumping of phonons by the dynamics of a Magnetic Film into a nonMagnetic contact. The enhanced damping due to the loss of energy and angular momentum shows interference patterns as a function of the resonance frequency and Magnetic Film thickness that cannot be described by viscous ("Gilbert") damping. The phonon pumping depends on the magnetization direction as well as geometrical and material parameters and is observable, e.g., in thin Films of yttrium iron garnet on a thick dielectric substrate.
Chiaki Ishikawa - One of the best experts on this subject based on the ideXlab platform.
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influence of longitudinal bias field on magnetization distribution in magnetoresistive head with shield Films
Journal of Applied Physics, 1994Co-Authors: Chiaki Ishikawa, Yutaka Sugita, Kaori Suzuki, Kazuetsu Yoshida, K Shinagawa, Yoshinobu Nakatani, Nobuo HayashiAbstract:The magnetization distribution in the magnetoresistive (MR) Film has been calculated by self‐consistently solving the three‐dimensional field of the MR head. The magnetization distribution was calculated based on the Landau–Lifshitz–Gilbert equation and the head field was obtained by the Maxwell equation. The longitudinal bias field for the domain control was generated by exchange‐coupled antiferroMagnetic or permanent Magnetic Films which were formed outside the sensing region of the MR Film. The resistance change of the MR Film was calculated from the magnetization distribution with shield Films and without shield Films. It was found that the resistance change with the antiferroMagnetic Film without the shields was about two times larger than that with the permanent Magnetic Film with the remanence Br of 0.7 T. The difference between them was reduced when the shields were formed because the stray field from the permanent Magnetic Film which is applied to the MR Film was decreased by the shields. Further...
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simulation of magnetization distribution in magnetoresistive Film under a longitudinal bias field
Journal of Applied Physics, 1993Co-Authors: Chiaki Ishikawa, Yutaka Sugita, Kaori Suzuki, Naoki Koyama, Kazuetsu Yoshida, K Shinagawa, Yoshinobu Nakatani, Nobuo HayashiAbstract:The effects of longitudinal bias field, used for domain control on the magnetization distribution in a magnetoresistive (MR) Film, have been investigated by computer simulation. The longitudinal bias field was generated by an exchange‐coupled antiferroMagnetic or permanent Magnetic Film formed on the MR Film outside the sensing region. It was assumed that the magnetization in the part of the MR Film on which the bias‐generating Films were formed was fixed along the easy axis. The spatial sensitivity of the MR Film along the track width was evaluated by calculating the dependence of the resistance change on the position of a narrow track recording medium. It was found that the resistance change in the MR Film with the anti‐ferroMagnetic Film was roughly twice as large as the change in the Film with the permanent Magnetic Film. The asymmetric sensitivity profile with respect to reflection about the track width mid‐plane was also obtained. The asymmetry in the track sensitivity profile was found to be caused by three factors: asymmetric magnetization distribution about the track width mid‐plane due to the transverse bias field, the difference in angular changes in the magnetization direction in the left and right regions facing the recording medium, and anisotropic flux propagation in the MR Film.
V I Belotelov - One of the best experts on this subject based on the ideXlab platform.
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resonances of the magneto optical intensity effect mediated by interaction of different modes in a hybrid magnetoplasmonic heterostructure with gold nanoparticles
Optics Express, 2019Co-Authors: A E Khramova, M A Kozhaev, Alexander N Shaposhnikov, V N Berzhansky, D O Ignatyeva, S A Dagesyan, S V Tomilin, V I BelotelovAbstract:Here we demonstrate a novel magnetoplasmonic heterostructure for efficient control of light. It consists of gold nanoparticles embedded in a thin Magnetic Film covered with a gold layer pierced with periodic nanoslit array. Unique feature of the proposed structure is that it supports four different types of optical modes in the same frequency range including localized and propagating surface plasmons along with waveguide modes. A peculiar magneto-optical response appears at the frequencies of the mode hybridization. The most important result comes from hybridization of the localized and propagating plasmons leading to a significant increase of the magneto-optical effect intensity.
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resonances of the magneto optical intensity effect mediated by interaction of different modes in a hybrid magnetoplasmonic heterostructure with gold nanoparticles
arXiv: Optics, 2019Co-Authors: A E Khramova, M A Kozhaev, Alexander N Shaposhnikov, V N Berzhansky, D O Ignatyeva, S A Dagesyan, S V Tomilin, V I BelotelovAbstract:Here we demonstrate a novel smart magnetoplasmonic heterostructure for efficient control of light. It consists of gold nanoparticles embedded in a thin Magnetic Film covered with a gold layer pierces with periodic nanoslit array. Unique feature of the proposed structure is that it supports four different types of optical modes in the same frequency range including localized and propagating surface plasmons along with waveguide modes. A peculiar magneto-optical response appears at the frequencies of the mode hybridization. The most prominent result comes from hybridization of the localized and propagating plasmons leading to a significant increase of the magneto-optical intensity effect.
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giant peak of the inverse faraday effect in the band gap of magnetophotonic microcavity
Scientific Reports, 2018Co-Authors: M A Kozhaev, Alexander I Chernov, D A Sylgacheva, Alexander N Shaposhnikov, A R Prokopov, V N Berzhansky, A K Zvezdin, V I BelotelovAbstract:Optical impact on the spin system in a Magnetically ordered medium provides a unique possibility for local manipulation of magnetization at subpicosecond time scales. One of the mechanisms of the optical manipulation is related to the inverse Faraday effect (IFE). Usually the IFE is observed in crystals and Magnetic Films on a substrate. Here we demonstrate the IFE induced by fs-laser pulses in the Magnetic Film inside the magnetophotonic microcavity. Spectral dependence of the IFE on the laser pulse wavelength in the band gap of the magnetophotonic microcavity has a sharp peak leading to a significant enhancement of the IFE. This phenomenon is explained by strong confinement of the electroMagnetic energy within the Magnetic Film. Calculated near field distribution of the IFE effective Magnetic field indicates its subwavelength localization within 30 nm along the Film thickness. These excited volumes can be shifted along the sample depth via e.g. changing frequency of the laser pulses. The obtained results open a way for ultrafast optical control of magnetization at subwavelength scales.
Sayeef Salahuddin - One of the best experts on this subject based on the ideXlab platform.
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mechanical back action of a spin wave resonance in a magnetoelastic thin Film on a surface acoustic wave
Physical Review B, 2016Co-Authors: P G Gowtham, Dominic Labanowski, Sayeef SalahuddinAbstract:Surface acoustic waves (SAWs) traveling on the surface of a piezoelectric crystal can, through the magnetoelastic interaction, excite traveling spin-wave resonance in a Magnetic Film deposited on the substrate. This spin-wave resonance in the Magnetic Film creates a time-dynamic surface stress of magnetoelastic origin that acts back on the surface of the piezoelectric and modifies the SAW propagation. Unlike previous analyses that treat the excitation as a magnon-phonon polariton, here the magnetoelastic Film is treated as a perturbation modifying boundary conditions on the SAW. We use acoustical perturbation theory to find closed-form expressions for the back-action surface stress and strain fields and the resultant SAW velocity shifts and attenuation. We demonstrate that the shear stress fields associated with this spin-wave back-action also generate effective surface currents on the piezoelectric both in phase and out of phase with the driving SAW potential. Characterization of these surface currents and their applications in determination of the magnetoelastic coupling are discussed. The perturbative calculation is carried out explicitly to first order (a regime corresponding to many experimental situations of current interest) and we provide a sketch of the implications of the theory at higher order.
