The Experts below are selected from a list of 37779 Experts worldwide ranked by ideXlab platform
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
Steven Lequeux - 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
Stefan Blugel - One of the best experts on this subject based on the ideXlab platform.
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dzyaloshinskii moriya interaction accounting for the orientation of Magnetic Domains in ultrathin films fe w 110
Physical Review B, 2008Co-Authors: Marcus Heide, G Bihlmayer, Stefan BlugelAbstract:Combining relativistic first-principles calculations with a microMagnetic model, we establish the Dzyaloshinskii-Moriya interaction as an important mechanism in thin-film magnetism, determining the orientation of Magnetic Domains relative to the lattice, the type of domain wall, and the rotational direction of the magnetization in the wall. Applying the analysis to two monolayers Fe on W(110), we provide an explanation for puzzling experimental data obtained by spin-polarized scanning tunneling microscopy.
A Labarta - One of the best experts on this subject based on the ideXlab platform.
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driving Magnetic Domains at the nanoscale by interfacial strain induced proximity
Nanoscale, 2021Co-Authors: Ilya Valmianski, Arantxa Fraile Rodriguez, Javier Rodriguezalvarez, Montserrat Garcia Del Muro, Christian Wolowiec, Florian Kronast, Juan Gabriel Ramirez, Ivan K Schuller, A Labarta, X BatlleAbstract:We investigate the local nanoscale changes of the Magnetic anisotropy of a Ni film subject to an inverse magnetostrictive effect by proximity to a V2O3 layer. Using temperature-dependent photoemission electron microscopy (PEEM) combined with X-ray Magnetic circular dichroism (XMCD), direct images of the Ni spin alignment across the first-order structural phase transition (SPT) of V2O3 were obtained. We find an abrupt temperature-driven reorientation of the Ni Magnetic Domains across the SPT, which is associated with a large increase of the coercive field. Moreover, angular dependent ferroMagnetic resonance (FMR) shows a remarkable change in the Magnetic anisotropy of the Ni film across the SPT of V2O3. MicroMagnetic simulations based on these results are in quantitative agreement with the PEEM data. Direct measurements of the lateral correlation length of the Ni Domains from XMCD images show an increase of almost one order of magnitude at the SPT compared to room temperature, as well as a broad spatial distribution of the local transition temperatures, thus corroborating the phase coexistence of Ni anisotropies caused by the V2O3 SPT. We show that the rearrangement of the Ni Domains is due to strain induced by the oxide layers' structural Domains across the SPT. Our results illustrate the use of alternative hybrid systems to manipulate Magnetic Domains at the nanoscale, which allows for engineering of coercive fields for novel data storage architectures.
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Magnetic Domains and surface effects in hollow maghemite nanoparticles
Physical Review B, 2009Co-Authors: Andreu Cabot, Paul A Alivisatos, Victor F Puntes, Lluis Balcells, Oscar Iglesias, A LabartaAbstract:In the present work, we investigate the Magnetic properties of ferriMagnetic and non-interacting maghemite hollow nanoparticles obtained by the Kirkendall effect. From the experimental characterization of their Magnetic behavior, we find that polycrystalline hollow maghemite nanoparticles exhibit low blocked-to-superparaMagnetic transition temperatures, small Magnetic moments, significant coercivities and irreversibility fields, and no Magnetic saturation on external Magnetic fields up to 5 T. These results are interpreted in terms of the microstructural parameters characterizing the maghemite shells by means of atomistic Monte Carlo simulations of an individual spherical shell. The model comprises strongly interacting crystallographic Domains arranged in a spherical shell with random orientations and anisotropy axis. The Monte Carlo simulation allows discernment between the influence of the polycrystalline structure and its hollow geometry, while revealing the Magnetic domain arranggement in the different temperataure regimes.
Emmanuelle Lacaze - One of the best experts on this subject based on the ideXlab platform.
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crossover to striped Magnetic Domains in fe1 xgax magnetostrictive thin films
Applied Physics Letters, 2012Co-Authors: M Barturen, Rache B Salles, P Schio, J Milano, A Butera, Sebastian Bustingorry, C A Ramos, A J A De Oliveira, M Eddrief, Emmanuelle LacazeAbstract:We have studied the Magnetic properties at room temperature of Fe1−xGax (FeGa) epitaxial thin films grown on ZnSe/GaAs(100) for 0.14≤x≤0.29 range concentration, and film thicknesses, d = 36 and 72 nm. The study was performed by means of magnetometric measurements and Magnetic force microscopy scans. Increasing x promotes the loss of the four-fold Magnetic-crystalline anisotropy associated to an Fe-like behavior, which is lost completely above x = 0.20. Stripe Domains with rotatable anisotropy are observed even in samples in which the theoretical conditions for stripe appearance are not completely fulfilled. An unexpected “saw-tooth” stripe structure has been found under certain conditions.
