The Experts below are selected from a list of 1932 Experts worldwide ranked by ideXlab platform
T H Johansen - One of the best experts on this subject based on the ideXlab platform.
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faraday rotation and sensitivity of 100 bismuth substituted ferrite Garnet films
Physical Review B, 2002Co-Authors: L E Helseth, A Solovyev, R W Hansen, E I Ilyashenko, M Baziljevich, T H JohansenAbstract:We have investigated the Faraday rotation of in-plane magnetized bismuth-substituted ferrite Garnet films grown by liquid phase epitaxy on (100) oriented gadolinium gallium Garnet substrates. The Faraday spectra were measured for photon energies between 1.7 and 2.6 eV. To interpret the spectra, we use a model based on two electric dipole transitions: one tetrahedral and one octahedral. Furthermore, the Faraday rotation sensitivity was measured at 2.3 eV, and found to be in good agreement with the theoretical predictions. In particular, we find that the sensitivity increases linearly with the bismuth content and nonlinearly with the gallium content.
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faraday rotation spectra of bismuth substituted ferrite Garnet films with in plane magnetization
Physical Review B, 2001Co-Authors: L E Helseth, R W Hansen, E I Ilyashenko, M Baziljevich, T H JohansenAbstract:Single crystal films of bismuth-substituted ferrite Garnets have been synthesized by the liquid phase epitaxy method where gadolinium gallium Garnet substrates are dipped into the flux. The growth parameters are controlled to obtain films with in-plane magnetization and virtually no domain activity, which makes them excellently suited for magnetooptic imaging. The Faraday rotation spectra were measured across the visible range of wavelengths. To interpret the spectra we present a simple model based on the existence of two optical transitions of diamagnetic character, one tetrahedral and one octahedral. We find excellent agreement between the model and our experimental results for photon energies between 1.77 and 2.53 eV, corresponding to wavelengths between 700 and 490 nm. It is shown that the Faraday rotation changes significantly with the amount of substituted gallium and bismuth. Furthermore, the experimental results confirm that the magnetooptic response changes linearly with the bismuth substitution.
Ben J Youssef - One of the best experts on this subject based on the ideXlab platform.
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inverse spin hall effect in nanometer thick yttrium iron Garnet pt system
Applied Physics Letters, 2013Co-Authors: Dallivy O Kelly, A. Anane, R. Bernard, C. Hahn, A H. Molpeceres, C. Carrétéro, E. Jacquet, C. Deranlot, Ben J Youssef, P. BortolottiAbstract:High quality nanometer-thick (20 nm, 7 nm, and 4 nm) epitaxial Yttrium Iron Garnet (YIG) films have been grown on gadolinium gallium Garnet substrates using pulsed laser deposition. The Gilbert damping coefficient for the 20 nm thick films is 2.3 × 10−4 which is the lowest value reported for sub-micrometric thick films. We demonstrate Inverse spin Hall effect (ISHE) detection of propagating spin waves using Pt. The amplitude and the lineshape of the ISHE voltage correlate well to the increase of the Gilbert damping when decreasing thickness of YIG. Spin Hall effect based loss-compensation experiments have been conducted but no change in the magnetization dynamics could be detected.
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site selective couplings in x ray detected magnetic resonance spectra of rare earth substituted yttrium iron Garnets
New Journal of Physics, 2012Co-Authors: J Goulon, A Rogalev, F Wilhelm, G Goujon, A N Yaresko, Ch Brouder, Ben J YoussefAbstract:Site-selective x-ray detected magnetic resonance (XDMR) spectra were recorded in transverse detection geometry on two iron Garnet thin films grown by liquid phase epitaxy (LPE) on oriented gadolinium gallium Garnet (GGG) substrates: whereas the stoichiometry of the first film corresponded to pure yttrium iron Garnet (1 = YIG) used as reference, yttrium was partly substituted with lanthanum and lutetium in the second film (2 = La–Lu–YIG). Surprisingly, the XDMR spectra of film 2 recorded at either the Fe K-edge or the La L3-edge revealed well-resolved structures that had fairly different relative intensity depending on whether we probed the tetrahedral () sites of iron or the dodecahedral () sites of lanthanum. The narrow XDMR lines measured at the Fe K-edge also contrast with the broad, foldover distorted lineshapes of the ferrimagnetic resonance spectra measured in the same scan. Further XDMR experiments were carried out with a thin, disc-shaped, single crystal of gadolinium iron Garnet (3 = GdIG). At temperatures slightly above the gadolinium ordering temperature (T > TB = 69 K), the Gd L2-edge XDMR spectra were dominated by two well-resolved lines of nearly equal intensities. Similarly, the Fe K-edge XDMR spectra recorded under identical conditions did also split into several narrow lines but of strongly unequal intensity. These results suggest that, in the exchange-enhanced paramagnetic regime, spins precessing at the dodecahedral () sites of gadolinium do not couple in the same way with spins precessing at either the tetrahedral () or octahedral () sites of iron. On the other hand, destructive interferences between modes of opposite helicities were also observed in Fe K-edge XDMR spectra recorded far above the compensation temperature (T ≫ Tcp = 290 K). This looks like a typical signature of nonlinear four-magnon scattering processes at a very high pumping power.
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site selective couplings in x ray detected magnetic resonance spectra of rare earth substituted yttrium iron Garnets
New Journal of Physics, 2012Co-Authors: J Goulon, A Rogalev, F Wilhelm, G Goujon, A N Yaresko, Ch Brouder, Ben J YoussefAbstract:Site-selective x-ray detected magnetic resonance (XDMR) spectra were recorded in transverse detection geometry on two iron Garnet thin films grown by liquid phase epitaxy (LPE) on oriented gadolinium gallium Garnet (GGG) substrates: whereas the stoichiometry of the first film corresponded to pure yttrium iron Garnet (1 = YIG) used as reference, yttrium was partly substituted with lanthanum and lutetium in the second film (2 = La–Lu–YIG). Surprisingly, the XDMR spectra of film 2 recorded at either the Fe K-edge or the La L3-edge revealed well-resolved structures that had fairly different relative intensity depending on whether we probed the tetrahedral () sites of iron or the dodecahedral () sites of lanthanum. The narrow XDMR lines measured at the Fe K-edge also contrast with the broad, foldover distorted lineshapes of the ferrimagnetic resonance spectra measured in the same scan. Further XDMR experiments were carried out with a thin, disc-shaped, single crystal of gadolinium iron Garnet (3 = GdIG). At temperatures slightly above the gadolinium ordering temperature (T > TB = 69 K), the Gd L2-edge XDMR spectra were dominated by two well-resolved lines of nearly equal intensities. Similarly, the Fe K-edge XDMR spectra recorded under identical conditions did also split into several narrow lines but of strongly unequal intensity. These results suggest that, in the exchange-enhanced paramagnetic regime, spins precessing at the dodecahedral () sites of gadolinium do not couple in the same way with spins precessing at either the tetrahedral () or octahedral () sites of iron. On the other hand, destructive interferences between modes of opposite helicities were also observed in Fe K-edge XDMR spectra recorded far above the compensation temperature (T ≫ Tcp = 290 K). This looks like a typical signature of nonlinear four-magnon scattering processes at a very high pumping power.
L E Helseth - One of the best experts on this subject based on the ideXlab platform.
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faraday rotation and sensitivity of 100 bismuth substituted ferrite Garnet films
Physical Review B, 2002Co-Authors: L E Helseth, A Solovyev, R W Hansen, E I Ilyashenko, M Baziljevich, T H JohansenAbstract:We have investigated the Faraday rotation of in-plane magnetized bismuth-substituted ferrite Garnet films grown by liquid phase epitaxy on (100) oriented gadolinium gallium Garnet substrates. The Faraday spectra were measured for photon energies between 1.7 and 2.6 eV. To interpret the spectra, we use a model based on two electric dipole transitions: one tetrahedral and one octahedral. Furthermore, the Faraday rotation sensitivity was measured at 2.3 eV, and found to be in good agreement with the theoretical predictions. In particular, we find that the sensitivity increases linearly with the bismuth content and nonlinearly with the gallium content.
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faraday rotation spectra of bismuth substituted ferrite Garnet films with in plane magnetization
Physical Review B, 2001Co-Authors: L E Helseth, R W Hansen, E I Ilyashenko, M Baziljevich, T H JohansenAbstract:Single crystal films of bismuth-substituted ferrite Garnets have been synthesized by the liquid phase epitaxy method where gadolinium gallium Garnet substrates are dipped into the flux. The growth parameters are controlled to obtain films with in-plane magnetization and virtually no domain activity, which makes them excellently suited for magnetooptic imaging. The Faraday rotation spectra were measured across the visible range of wavelengths. To interpret the spectra we present a simple model based on the existence of two optical transitions of diamagnetic character, one tetrahedral and one octahedral. We find excellent agreement between the model and our experimental results for photon energies between 1.77 and 2.53 eV, corresponding to wavelengths between 700 and 490 nm. It is shown that the Faraday rotation changes significantly with the amount of substituted gallium and bismuth. Furthermore, the experimental results confirm that the magnetooptic response changes linearly with the bismuth substitution.
Shilei Ding - One of the best experts on this subject based on the ideXlab platform.
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interfacial dzyaloshinskii moriya interaction and chiral magnetic textures in a ferrimagnetic insulator
Physical Review B, 2019Co-Authors: Shilei Ding, Andrew Ross, Romain Lebrun, S Becker, Kyujoon Lee, Isabella Boventer, Souvik Das, Yuichiro KurokawaAbstract:The interfacial Dzyaloshinskii-Moriya interaction (DMI) in multilayers of heavy metal and ferromagnetic metals enables the stabilization of novel chiral spin structures such as skyrmions. Magnetic insulators, on the other hand, can exhibit enhanced dynamics and properties such as lower magnetic damping and therefore it is of interest to combine the properties enabled by interfacial DMI with insulating systems. Here, we demonstrate the presence of interfacial DMI in heterostructures that include insulating magnetic layers. We use perpendicularly magnetized insulating thulium iron Garnet (TmIG) films capped by the heavy metal platinum, grown on gadolinium gallium Garnet (GGG) substrates, and find a surprisingly strong interfacial DMI that, combined with spin-orbit torque, results in efficient switching. The interfacial origin is confirmed through thickness-dependence measurements of the DMI, revealing the characteristic 1/thickness dependence. We combine chiral spin structures and spin-orbit torques for efficient switching and identify skyrmions that allow us to establish the GGG/TmIG interface as the possible origin of the DMI.
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epitaxial growth of y3fe5o12 thin films with perpendicular magnetic anisotropy
Applied Physics Letters, 2017Co-Authors: Muxin Hua, Xin Wen, Mingzhu Xue, Shilei Ding, Meng Wang, Shunquan Liu, Jingzhi Han, Changsheng Wang, Yingchang Yang, Jinbo YangAbstract:Here, we report the realization of epitaxial Y3Fe5O12 (YIG) thin films with perpendicular magnetic anisotropy (PMA). The films are grown on the substituted gadolinium gallium Garnet substrate (SGGG) by pulsed laser deposition. It was found that a thin buffer layer of Sm3Ga5O12 (SmGG) grown on top of SGGG can suppress the strain relaxation, which helps induce a large enough PMA to overcome the shape anisotropy in YIG thin films. The reciprocal space mappings analysis reveals that the in-plane strain relaxation is suppressed, while the out-of-plane strain relaxation exhibits a strong dependence on the film thickness. We found that the PMA can be achieved for both bilayer (YIG/SmGG) and tri-layer (SmGG/YIG/SmGG) structural films with YIG layer thicknesses up to 20 nm and 40 nm, respectively.
C Garcia - One of the best experts on this subject based on the ideXlab platform.
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magnetism and spin transport in rare earth rich epitaxial terbium and europium iron Garnet films
Physical Review Letters, 2018Co-Authors: Ethan Rosenberg, Lukas Beran, Can Onur Avci, Cyrus Zeledon, Bingqian Song, Claudio Gonzalezfuentes, Johannes Mendil, Pietro Gambardella, Martin Veis, C GarciaAbstract:Rare-earth iron Garnet thin films with perpendicular magnetic anisotropy (PMA) have recently attracted a great deal of attention for spintronic applications. Thulium iron Garnet (TmIG) has been successfully grown and TmIG/Pt heterostructures have been characterized. However, TmIG is not the only rare-earth iron Garnet that can be grown with PMA. We report the growth, magnetic, and spintronic properties of epitaxial terbium iron Garnet (TbIG) and europium iron Garnet (EuIG) thin films with PMA. Reciprocal space mapping shows the films are lattice matched to the substrate without strain relaxation, even for films up to 56 nm thick. The lattice strain and magnetostriction coefficient produce PMA in certain cases. TbIG grows on (111) gadolinium gallium Garnet (GGG) with PMA due to the in-plane compressive strain, whereas TbIG on (111) substituted GGG (SGGG) is in tension and has an in-plane easy axis. EuIG grows with PMA on (100) and (111) GGG substrates, which facilitates the investigation of spintronic properties as a function of orientation. Both Garnets have excess rare earth, which is believed to occupy Fe octahedral sites and in the case of TbIG is associated with an increase in the compensation temperature to 330 K, higher than the bulk value. Anomalous Hall effect (AHE) measurements of Pt/EuIG Hall crosses show that the spin mixing conductance of Pt/ (111) and (100) EuIG is similar. AHE measurements of Pt/TbIG Hall crosses reveal a sign change in the AHE amplitude at the compensation point analogous to all-metallic systems.
