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Magnon Spin Transport through Atomic Ferrimagnetic Domain Walls
1University of Electronic Science and Technology of China, State Key Laboratory of Electronic Thin Films and Integrated Devices, School of Physics and , Chengdu 611731, China.
Abstract:
It is a well-established notion that the spin of a magnon should be flipped when it passes through a 180° domain wall (DW) in both ferromagnets and antiferromagnets, while the magnon spin transport through ferrimagnetic DW is still elusive. In this Letter, we report that the magnon preserves its spin after the transmission through an atomically sharp DW in ferrimagnets due to the intriguing interband magnon scattering at the domain interface. This finding may provide significant insight to resolve the puzzling insensitivity of magnon spin diffusion to the 180° ferrimagnetic DWs observed by recent experiments. Our results reveal the unique role of ferrimagnetic DWs in manipulating the magnon spin and may facilitate the design of novel magnonic devices based on ferrimagnets.
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