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Phys. Rev. B 104, L180401 (2021)

Magnetically switchable spin-wave retarder with 90 antiferromagnetic domain wall

Feiyang Ye and Jin Lan*

Center for Joint Quantum Studies and Department of Physics, School of Science, Tianjin University, 92 Weijin Road, Tianjin 300072, China

* Corresponding author :   lanjin@tju.edu.cn

Abstract

Polarization, denoting the precession direction with respect to the background magnetization, is an intrinsic degree of freedom of a spin wave. Using magnetic textures to control the spin-wave polarization is fundamental and indispensable toward reprogrammable polarization-based magnonics. Here, we show that due to the intrinsic cubic anisotropy, a 90 antiferromagnetic domain wall naturally acts as a spin-wave retarder (waveplate). Moreover, for a 90 domain wall pair developed by introducing a second domain in a homogenous antiferromagnetic wire, the sign of the retarding effect can be flipped by simply switching the magnetization direction of the intermediate domain.

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Center for Joint Quantum Studies, School of Science, Tianjin University     Address : Yaguan Road 135, Jinnan District, 300350 Tianjin, P. R. China