Abstract
Magnetism primarily describes the physics and materials science of systems presenting a magnetization – a macroscopic order parameter characterizing electron angular momentum. The order parameter is associated with the electronic exchange interactions, which are fundamentally quantum mechanical. Its dynamic behavior bridges the macroscopic and the microscopic worlds. On macroscopic length and time scales, it interacts with electromagnetic fields dictated by Maxwell’s equations. On a microscopic scale, it involves the quantum-mechanical electronic states both in spin space and momentum space, thus giving rise to a wide range of behaviors that extend down to femtoseconds. Thanks to the development of modern metrology, there have been many new and noteworthy observations of magnetism-related phenomena across the entire range – from spin-torque-induced anti-damping dynamics to ultrafast laser-induced femtosecond electron dynamics that involve spin current and angular momentum conservation. In this review, we introduce some observations on magnetodynamics and the scientific subjects these new results give rise to.
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Acknowledgements
A.D.K. acknowledges partial support by the National Science Foundation under Award DMR-1610416. Work at NYU was also supported in part by the Quantum-Materials for Energy Efficient Neuromorphic-Computing, an Energy Frontier Research Center funded by DOE, Office of Science, BES, under Award DE-SC0019273.
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Kent, A.D., Ohldag, H., Dürr, H.A., Sun, J.Z. (2021). Magnetization Dynamics. In: Coey, J.M.D., Parkin, S.S. (eds) Handbook of Magnetism and Magnetic Materials. Springer, Cham. https://doi.org/10.1007/978-3-030-63210-6_27
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