Macrospin models of spin transfer dynamics
By Jiang Xiao, A. Zangwill, Mark D. Stiles. 2005
202 citations recorded by the source corpus.
The current-induced magnetization dynamics of a spin valve are studied using a macrospin (single-domain) approximation and numerical solutions of a generalized Landau-Lifshitz-Gilbert equation. For the purpose of quantitative comparison to experiment [S. I. Kiselev, J. C. Sankey, I. N. Krivortov, N. C. Emley, R. J. Schoelkopf, R. A. Buhrman, and D. C. Ralph, Nature 425, 380 (2003)], we calculate the resistance and microwave power as a function of current and external field, including the effects of anisotropies, damping, spin-transfer torque, thermal fluctuations, spin-pumping, and incomplete absorption of transverse spin current. Although many features of experiment appear in the simulations, there are two significant discrepancies: the current dependence of the precession frequency and the presence and/or absence of a microwave quiet magnetic phase with a distinct magnetoresistance signature. Comparison is made to micromagnetic simulations designed to model the same experiment.
Subfields: Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/ea9328a64d923eac4eaf002fa90ba60b5a6e10e0
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In Atomic and Molecular Physics, and Optics
- Weisheng Zhao
- Jacques-Olivier Klein
- Dafine Ravelosona
- Yue Zhang
- Anders Eklund
- Ahmad A. Awad
- Ana Rusu
- Claude Chappert
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Nonlinear Auto-Oscillator Theory of Microwave Generation by Spin-Polarized Current (2009, methodology): “Numerical study of thermal effects in STO made in the macrospin approximation were done in [110], [111].”
- Spin-Torque and Spin-Hall Nano-Oscillators (2015, methodology): “One possible simplified approach to solving the LLGS is based on the macrospin approximation, which assumes that only a spatially uniform magnetization precession is excited and that the spin-polarized current is uniform across the area of the free layer [30], [275].”
- Compact Modeling of Perpendicular-Anisotropy CoFeB/MgO Magnetic Tunnel Junctions (2012, background): “A discussion and concluding remarks are provided in Section V.”