Spin-torque driven magnetization dynamics : Micromagnetic modeling
By D. Berkov, J. Miltat. 2007
177 citations recorded by the source corpus.
Abstract In this paper, we present an overview of recent progress made in the understanding of the spin-torque induced magnetization dynamics in nanodevices using mesoscopic micromagnetic simulations. We first specify how a spin-torque term may be added to the usual Landau–Lifshitz–Gilbert equation of magnetization motion and detail its physical meaning. After a brief description of spin-torque driven dynamics in the macrospin approximation , we discuss the validity of this approximation for various experimentally relevant geometries. Next, we perform a detailed comparison between accurate experimental data obtained from nanopillar devices and corresponding numerical modeling. We show that, on one hand, many qualitatively important features of the observed magnetization dynamics (e.g. non-linear frequency shift and frequency jumps with increasing current) can be satisfactory explained by sophisticated micromagnetic models, but on the other hand, understanding of these experiments is still far from being complete. We proceed with the numerical analysis of point-contact experiments , where an even more complicated magnetization dynamics is observed. Simulations reveal that such a rich behavior is due to the formation of several strongly non-linear oscillation modes. In the last part of the paper we emphasize the importance of sample characterization and conclude with some important remarks concerning the relation between micromagnetic modeling and real experiments.
Subfields: Atomic and Molecular Physics, and Optics, Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/4c05b6a41f81732f9781e3e3d7d2f991bcff7a45
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In Atomic and Molecular Physics, and Optics
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Citations in the corpus
- Strong Field Interactions between a Nanomagnet and a Photonic Cavity (2009, unknown): “Spin torque can be used to manipulate magnetic orientation [46, 104] and to cause the magnetization to precess [43,47,105] at microwave frequencies.”
- Proposal of a Spin Torque Majority Gate Logic (2010, methodology): “Our simulations are based on the Landau–Lifshitz–Gilbert equation [22] for magnetization.”
- Magnetization oscillations and waves driven by pure spin currents (2016, background): “Since the first demonstration [1-5] of the possibility to excite magnetization dynamics by spin-polarized electric currents due to the spin transfer torque (STT) effect [6,7], dynamic spin torque phenomena have become the subject of intense research [8-15].”