The Experts below are selected from a list of 26049 Experts worldwide ranked by ideXlab platform
B Hillebrands - One of the best experts on this subject based on the ideXlab platform.
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thickness and power dependence of the spin Pumping Effect in y3fe5o12 pt heterostructures measured by the inverse spin hall Effect
Physical Review B, 2015Co-Authors: Matthias B Jungfleisch, A V Chumak, Andreas Kehlberger, V Lauer, Mehmet C Onbasli, C A Ross, Mathias Klaui, B HillebrandsAbstract:The dependence of the spin-Pumping Effect on the yttrium iron garnet $({\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$, YIG) thickness detected by the inverse spin Hall Effect (ISHE) has been investigated quantitatively. Due to the spin-Pumping Effect driven by the magnetization precession in the ferrimagnetic insulator ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ film a spin-polarized electron current is injected into the Pt layer. This spin current is transformed into electrical charge current by means of the ISHE. An increase of the ISHE voltage with increasing film thickness is observed and compared to the theoretically expected behavior. The Effective damping parameter of the YIG/Pt samples is found to be enhanced with decreasing ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ film thickness. The investigated samples exhibit a spin mixing conductance of ${g}_{\mathrm{eff}}^{\ensuremath{\uparrow}\ensuremath{\downarrow}}=(3.87\ifmmode\pm\else\textpm\fi{}0.21)\ifmmode\times\else\texttimes\fi{}{10}^{18}\phantom{\rule{0.28em}{0ex}}{\mathrm{m}}^{\ensuremath{-}2}$ and a spin Hall angle between ${\ensuremath{\theta}}_{\mathrm{ISHE}}=0.013\ifmmode\pm\else\textpm\fi{}0.001$ and $0.045\ifmmode\pm\else\textpm\fi{}0.004$ depending on the used spin-diffusion length. Furthermore, the influence of nonlinear Effects on the generated voltage and on the Gilbert damping parameter at high excitation powers is revealed. It is shown that for small YIG film thicknesses a broadening of the linewidth due to nonlinear Effects at high excitation powers is suppressed because of a lack of nonlinear multimagnon scattering channels. We have found that the variation of the spin-Pumping efficiency for thick YIG samples exhibiting pronounced nonlinear Effects is much smaller than the nonlinear enhancement of the damping.
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improvement of the yttrium iron garnet platinum interface for spin Pumping based applications
Applied Physics Letters, 2013Co-Authors: Matthias B Jungfleisch, A V Chumak, V Lauer, R Neb, B HillebrandsAbstract:The dependence of the spin Pumping efficiency and the spin mixing conductance on the surface processing of yttrium iron garnet (YIG) before the platinum (Pt) deposition has been investigated quantitatively. The ferromagnetic resonance driven spin Pumping injects a spin polarized current into the Pt layer, which is transformed into an electromotive force by the inverse spin Hall Effect. Our experiments show that the spin Pumping Effect indeed strongly depends on the YIG/Pt interface condition. We measure an enhancement of the inverse spin Hall voltage and the spin mixing conductance by more than two orders of magnitude with improved sample preparation.
V Baltz - One of the best experts on this subject based on the ideXlab platform.
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enhanced spin Pumping efficiency in antiferromagnetic irmn thin films around the magnetic phase transition
Physical Review Letters, 2016Co-Authors: L Frangou, Simon Oyarzun, Stephane Auffret, L Vila, Serge Gambarelli, V BaltzAbstract:We report the measurement of a spin Pumping Effect due to fluctuations of the magnetic order of IrMn thin films. A precessing NiFe ferromagnet injected spins into IrMn spin sinks, and enhanced damping was observed around the IrMn magnetic phase transition. Our data were compared to a recently developed theory and converted into interfacial spin mixing conductance enhancements. By spotting the spin Pumping peak, the thickness dependence of the IrMn critical temperature could be determined and the characteristic length for the spin-spin interactions was deduced.
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enhanced spin Pumping efficiency in antiferromagnetic irmn thin films around the magnetic phase transition
Physical Review Letters, 2016Co-Authors: L Frangou, Simon Oyarzun, Stephane Auffret, L Vila, Serge Gambarelli, V BaltzAbstract:We report measurement of a spin Pumping Effect due to fluctuations of the magnetic order of IrMn thin films. A precessing NiFe ferromagnet injected spins into IrMn spin sinks, and enhanced damping was observed around the IrMn magnetic phase transition. Our data was compared to a recently developed theory and converted into interfacial spin mixing conductance enhancements. By spotting the spin Pumping peak, the thickness dependence of the IrMn critical temperature could be determined and the characteristic length for the spin-spin interactions was deduced.
Eiji Saitoh - One of the best experts on this subject based on the ideXlab platform.
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inverse spin hall Effect and spin Pumping in metallic films invited
Journal of Applied Physics, 2008Co-Authors: K Harii, Kazuya Ando, H Y Inoue, K Sasage, Eiji SaitohAbstract:Inverse spin-Hall Effect (ISHE) was investigated in Ni81Fe19∕Pt and Ni81Fe19∕Cu films. By applying a microwave and a magnetic field to the films, a spin current is injected into the paramagnetic layer from the ferromagnetic Ni81Fe19 layer due to the spin-Pumping Effect operated by the ferromagnetic resonance. In the Ni81Fe19∕Pt film, this spin-current injection gives rise to electromotive force, which is attributed to ISHE in the Pt layer. In the Ni81Fe19∕Cu film, in contrast, this electromotive force disappears, indicating an important role of strong spin-orbit interaction in ISHE.
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detection of pure inverse spin hall Effect induced by spin Pumping at various excitation
Journal of Applied Physics, 2007Co-Authors: H Y Inoue, K Harii, Kazuya Ando, K Sasage, Eiji SaitohAbstract:Electric-field generation due to the inverse spin-Hall Effect (ISHE) driven by spin Pumping was detected and separated experimentally from the extrinsic magnetogalvanic Effects in a Ni81Fe19∕Pt film. By applying a sample-cavity configuration in which the extrinsic Effects are suppressed, the spin Pumping using ferromagnetic resonance gives rise to a symmetric spectral shape in the electromotive force spectrum, indicating that the motive force is due entirely to ISHE. This method allows the quantitative analysis of the ISHE and the spin-Pumping Effect. The microwave-power dependence of the ISHE amplitude is consistent with the prediction of a direct current-spin-Pumping scenario.
Kazumasa Nishimura - One of the best experts on this subject based on the ideXlab platform.
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increased magnetic damping of a single domain wall and adjacent magnetic domains detected by spin torque diode in a nanostripe
Applied Physics Letters, 2015Co-Authors: Steven Lequeux, J Sampaio, Paolo Bortolotti, T Devolder, Rie Matsumoto, Kay Yakushiji, Hitoshi Kubota, Akio Fukushima, Shinji Yuasa, Kazumasa NishimuraAbstract:Spin torque resonance has been used to simultaneously probe the dynamics of a magnetic domain wall and of magnetic domains in a nanostripe magnetic tunnel junction. Due to the large associated resistance variations, we are able to analyze quantitatively the resonant properties of these single nanoscale magnetic objects. In particular, we find that the magnetic damping of both the domains and the domain wall is doubled compared to the damping value of the host magnetic layer. We estimate the contributions to the damping arising from the dipolar couplings between the different layers in the junction and from the intralayer spin Pumping Effect, and find that they cannot explain the large damping enhancement that we observe. We conclude that the measured increased damping is intrinsic to large amplitudes excitations of spatially localized modes or solitons such as vibrating or propagating domain walls.
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increased magnetic damping of a single domain wall and adjacent magnetic domains detected by spin torque diode in a nanostripe
arXiv: Materials Science, 2015Co-Authors: Steven Lequeux, J Sampaio, Paolo Bortolotti, T Devolder, Rie Matsumoto, Kay Yakushiji, Hitoshi Kubota, Akio Fukushima, Shinji Yuasa, Kazumasa NishimuraAbstract:We use spin-torque resonance to probe simultaneously and separately the dynamics of a magnetic domain wall and of magnetic domains in a nanostripe magnetic tunnel junction. Thanks to the large associated resistance variations we are able to analyze quantitatively the resonant properties of these single nanoscale magnetic objects. In particular, we find that the magnetic damping of both domains and domain walls is doubled compared to the damping value of their host magnetic layer. We estimate the contributions to damping arising from dipolar couplings between the different layers in the junction and from the intralayer spin Pumping Effect. We find that they cannot explain the large damping enhancement that we observe. We conclude that the measured increased damping is intrinsic to large amplitudes excitations of spatially localized modes or solitons such as vibrating or propagating domain walls
Matthias B Jungfleisch - One of the best experts on this subject based on the ideXlab platform.
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thickness and power dependence of the spin Pumping Effect in y3fe5o12 pt heterostructures measured by the inverse spin hall Effect
Physical Review B, 2015Co-Authors: Matthias B Jungfleisch, A V Chumak, Andreas Kehlberger, V Lauer, Mehmet C Onbasli, C A Ross, Mathias Klaui, B HillebrandsAbstract:The dependence of the spin-Pumping Effect on the yttrium iron garnet $({\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$, YIG) thickness detected by the inverse spin Hall Effect (ISHE) has been investigated quantitatively. Due to the spin-Pumping Effect driven by the magnetization precession in the ferrimagnetic insulator ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ film a spin-polarized electron current is injected into the Pt layer. This spin current is transformed into electrical charge current by means of the ISHE. An increase of the ISHE voltage with increasing film thickness is observed and compared to the theoretically expected behavior. The Effective damping parameter of the YIG/Pt samples is found to be enhanced with decreasing ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ film thickness. The investigated samples exhibit a spin mixing conductance of ${g}_{\mathrm{eff}}^{\ensuremath{\uparrow}\ensuremath{\downarrow}}=(3.87\ifmmode\pm\else\textpm\fi{}0.21)\ifmmode\times\else\texttimes\fi{}{10}^{18}\phantom{\rule{0.28em}{0ex}}{\mathrm{m}}^{\ensuremath{-}2}$ and a spin Hall angle between ${\ensuremath{\theta}}_{\mathrm{ISHE}}=0.013\ifmmode\pm\else\textpm\fi{}0.001$ and $0.045\ifmmode\pm\else\textpm\fi{}0.004$ depending on the used spin-diffusion length. Furthermore, the influence of nonlinear Effects on the generated voltage and on the Gilbert damping parameter at high excitation powers is revealed. It is shown that for small YIG film thicknesses a broadening of the linewidth due to nonlinear Effects at high excitation powers is suppressed because of a lack of nonlinear multimagnon scattering channels. We have found that the variation of the spin-Pumping efficiency for thick YIG samples exhibiting pronounced nonlinear Effects is much smaller than the nonlinear enhancement of the damping.
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improvement of the yttrium iron garnet platinum interface for spin Pumping based applications
Applied Physics Letters, 2013Co-Authors: Matthias B Jungfleisch, A V Chumak, V Lauer, R Neb, B HillebrandsAbstract:The dependence of the spin Pumping efficiency and the spin mixing conductance on the surface processing of yttrium iron garnet (YIG) before the platinum (Pt) deposition has been investigated quantitatively. The ferromagnetic resonance driven spin Pumping injects a spin polarized current into the Pt layer, which is transformed into an electromotive force by the inverse spin Hall Effect. Our experiments show that the spin Pumping Effect indeed strongly depends on the YIG/Pt interface condition. We measure an enhancement of the inverse spin Hall voltage and the spin mixing conductance by more than two orders of magnitude with improved sample preparation.
