Journal ArticleDOI
Low damping constant for Co2FeAl Heusler alloy films and its correlation with density of states
Shigemi Mizukami,D. Watanabe,Mikihiko Oogane,Yasuo Ando,Yoshio Miura,Masafumi Shirai,Terunobu Miyazaki +6 more
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TLDR
Gilbert damping for epitaxial Co2FeAl Heusler alloy films was investigated by analyzing the data of ferromagnetic resonance measured at the frequency of 2.20 GHz as discussed by the authors.Abstract:
Gilbert damping for the epitaxial Co2FeAl Heusler alloy films was investigated. Gilbert damping constant for the films was evaluated by analyzing the data of ferromagnetic resonance measured at the frequency of 2–20 GHz. Gilbert damping constant for the film without annealing was rather large, while it decreased remarkably with postannealing. Gilbert damping constant for the film annealed at 600 °C was ≃0.001. These behavior of Gilbert damping constant can be well explained by the fact that the density of states calculated from first principles decreases with increasing the degree of B2 order.read more
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Interplay of large two-magnon ferromagnetic resonance linewidths and low Gilbert damping in Heusler thin films
W. K. Peria,T. A. Peterson,Anthony P. McFadden,Tao Qu,Changjiang Liu,Chris Palmstrom,Paul A. Crowell +6 more
TL;DR: In this paper, a large and anisotropic two-magnon scattering linewidth broadening is observed for measurements with the magnetization lying in the film plane, while linwidth measurements with magnetization saturated perpendicular to the sample plane reveal low Gilbert damping constants.
Journal ArticleDOI
Large anisotropy of Gilbert damping constant in L21-ordered Co2FeSi film
TL;DR: In this article, anisotropic damping of the magnetization dynamics in a highly ordered Heusler compound Co3−xFexSi (x = 1.0, 2.0 and 3.0) was demonstrated.
Journal ArticleDOI
Evolution of the interfacial perpendicular magnetic anisotropy constant of the Co2FeAl/MgO interface upon annealing
TL;DR: In this paper, a series of films with different thickness of the Heusler alloy Co2FeAl was investigated to study the effect of annealing on the interface with a MgO layer and on the bulk magnetic properties.
Journal ArticleDOI
Perspectives of Electric Field Controlled Switching in Perpendicular Magnetic Random Access
Guchang Han,Hao Meng,Jian Cheng Huang,Vinayak Bharat Naik,Cheow Hin Sim,Michael Tran,Sze Ter Lim +6 more
TL;DR: In this paper, a new approach using Oersted field guided EF switching in MRAM arrays was proposed to realize spin reorientation transition at an EF of 0.8 V/nm for the top-pin CoFeB/MgO magnetic tunnel junctions (MTJ) with the thermal stability factor of as high as 57 in the absence of EF.
Journal ArticleDOI
Efficient excitation and detection of standing spin wave in Permalloy film: Demonstration of spin wave resonator
TL;DR: In this paper, a magnetic resonator consisting of periodical nonmagnetic electrodes on a ferromagnetic metallic film has been fabricated, which can be controlled by the interval of the periodical electrode.
References
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Solution of the Schrödinger Equation in Periodic Lattices with an Application to Metallic Lithium
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TL;DR: In this article, the problem of solving the Schrodinger equation in a periodic lattice is studied from the point of view of the variation-iteration method, which leads to a very compact scheme if the potential $V(r)$ is spherically symmetrical within the inscribed spheres of the atomic polyhedra and constant in the space between them.
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Extrinsic contributions to the ferromagnetic resonance response of ultrathin films
Rodrigo Arias,D. L. Mills +1 more
TL;DR: In this paper, the authors developed a theory of the extrinsic contributions to the ferromagnetic resonance linewidth and frequency shift of ultrathin films by two magnon scattering by defects at surfaces and interfaces.
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On the Landau-Lifshitz relaxation in ferromagnetic metals
TL;DR: In this paper, it was shown that the scattering of ferromagnetic band-electrons by phonons combined with the spin-orbit interaction caused magnetic relaxation of the Landau-Lifshitz-Gilbert type.