Magnetization dynamics in thin CoFeB films

Authors: Atsushi Okada, Shikun He, Bo Gu, Shun Kanai, Anjan Soumyanarayanan, Sze Ter Lim, Michael Tran, Michiyasu Mori, Sadamichi Maekawa, Fumihiro Matsukura, Hideo Ohno, and Christos Panagopoulos

Published in: Proc Natl Acad Sci, 613864114, 2017.

Ferromagnetic resonance (FMR) is considered a standard tool in the study of magnetization dynamics, with an established analysis procedure. We show there is a missing piece of physics to consider to fully understand and precisely interpret FMR results. This physics manifests itself in the dynamics of magnetization and hence in FMR spectra of ferromagnets, where interfacial anisotropy is a fundamental term. Advances in ferromagnetic heterostructures enabled by developing cutting edge technology now allow us to probe and reveal physics previously hidden in the bulk properties of ferromagnets.


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