Issue 43, 2020, Issue in Progress

Tunable magnetic textures and excitation modes in FePt multilayer films

Abstract

Micromagnetic simulations have been performed to investigate the magnetic textures and dynamic properties of FePt-based multilayer films. The uniform state, Neel skyrmion and Bloch skyrmion can be obtained using variable magnetic parameters. A microwave field is applied to induce spin precession along the out-plane and in-plane axes. For the perpendicular resonance modes, low-frequency peaks are identified as domain-wall modes. It is shown that radial-like and azimuthal-like resonance modes appear with increase in frequency. The excited modes are qualitatively different when the microwave field is applied along the in-plane axis. For the uniform state, the phase responds to the excitation with waves that spread out in a circle, which is a characteristic feature of the azimuthal mode in the spin wave. Because of the nonuniform effective field in Neel and Bloch skyrmions, the dynamic response localizes at the center and the edge spreads into the adjacent domains. These observations are important for tunable and abundant high-frequency magnetic properties in skyrmion-based devices.

Graphical abstract: Tunable magnetic textures and excitation modes in FePt multilayer films

Article information

Article type
Paper
Submitted
19 Mar 2020
Accepted
22 Jun 2020
First published
07 Jul 2020
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2020,10, 25639-25644

Tunable magnetic textures and excitation modes in FePt multilayer films

M. Bi, L. Yuan, X. Wang, X. Weng and L. Deng, RSC Adv., 2020, 10, 25639 DOI: 10.1039/D0RA02534H

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