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arXiv · 2507.05618

Spin Current Generation Controlled by the N\'{e}el State in a Compensated Ferrimagnet

Xin Theng Lee·Takahiro Misawa·Mamoru Matsuo·Takeo Kato
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Abstract

Compensated ferrimagnets, which break sublattice and time-reversal symmetries in the ground state, exhibit an isotropic ferromagnet-like spin splitting despite a vanishing net magnetization, in contrast to altermagnets with momentum-dependent spin splitting. We investigate how isotropic spin splitting manifests in spin transport by analyzing the spin Seebeck effect and spin pumping in a junction between a compensated ferrimagnet and a normal metal. We show that compensated ferrimagnets generate a sizable spin Seebeck signal, with a sign that can be reversed by switching between the two N\'{e}el states. Furthermore, we demonstrate that spin pumping exhibits a N\'{e}el-state-dependent resonance splitting, which is absent in conventional antiferromagnets. These results identify spin pumping as a natural readout mechanism for compensated ferrimagnets and establish them as promising magnetization-free building blocks for spintronic memory devices.

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Xin Theng Lee, Takahiro Misawa, Mamoru Matsuo, Takeo Kato. 2025-07-08. Spin Current Generation Controlled by the N\'{e}el State in a Compensated Ferrimagnet. https://arxiv.org/abs/2507.05618

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