Between waves and patterns: Spin wave freezing in films with Dzyaloshinskii-Moriya interaction

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Date

2023-04-12

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American Physical Society

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Abstract

The relationship between waves and static pattern formation is an intriguing effect and remains unexplained in many areas of physics, including magnetism. We study the spin-wave-mediated spin reorientation transition (SRT) in magnetic films with uniaxial magnetic anisotropy and Dzyaloshinskii-Moriya interaction (DMI). In particular, we show that propagating spin waves can freeze in the SRT, causing periodic magnetic domains to arise, which is reminiscent of the wave amplitude distribution. This process can take place under the influence of a change in the magnetic field, but also of other parameters. Interestingly, at the SRT, DMI nonreciprocity leads to the emergence of flowing magnetization patterns, which suggests a spontaneous breaking of translational symmetry, and the formation of magnonic space-time crystals. The described phenomena are general and should take place in a large family of magnetic materials. Therefore, the results should be of great importance for the further development of spintronics and magnonics.

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Numerical simulations have been performed in Computational Centre, University in Białystok. JK and AM acknowledge support by the National Science Centre of Poland, project no. 2020/37/B/ST5/02299. PG and MK acknowledge support by the National Science Centre of Poland, project no. 2019/35/D/ST3/03729. VZ acknowledges support from Operational Programme Research, Development and Education, financed by the European Structural and Investment Funds and the Czech Ministry of Education, Youth, and Sports through Project No. SOLID21 CZ.02.1.01/0.0/0.0/16_019/0000760).

Keywords

Dzyaloshinskii-Moriya interaction, Magnetic anisotropy, Magnetic domains, Magnetic Phase Transition, Spin wave

Citation

Phys. Rev. B 107, 134416 (2023)

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Uniwersytet im. Adama Mickiewicza w Poznaniu
Biblioteka Uniwersytetu im. Adama Mickiewicza w Poznaniu
Ministerstwo Nauki i Szkolnictwa Wyższego