Spin Seebeck effect in magnetic junctions with a compensated ferrimagnet
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866909031043432448 |
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| author | Lee, Xin Theng Misawa, Takahiro Matsuo, Mamoru Kato, Takeo |
| author_facet | Lee, Xin Theng Misawa, Takahiro Matsuo, Mamoru Kato, Takeo |
| contents | Compensated ferrimagnets enable ferromagnet-like spin transport without net magnetization. We study the spin Seebeck effect in a compensated ferrimagnet/normal-metal junction using a four-sublattice model in which sublattice inequivalence arises from differences in exchange couplings, in contrast to the previously studied anisotropy-based mechanism. Within the nonequilibrium Green's function framework, we show that isotropic magnon splitting generates a robust spin current with a magnitude comparable to that in standard ferromagnetic junctions. We also demonstrate that the spin Seebeck effect vanishes in altermagnet junctions under identical conditions, thereby establishing compensated ferrimagnets as uniquely suited for thermal spin-current generation among magnetically compensated systems. These results provide a theoretical basis for the applications of compensated ferrimagnets with exchange-coupling asymmetry as stray-field-free spin-current sources in spintronic devices. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_09885 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spin Seebeck effect in magnetic junctions with a compensated ferrimagnet Lee, Xin Theng Misawa, Takahiro Matsuo, Mamoru Kato, Takeo Mesoscale and Nanoscale Physics Compensated ferrimagnets enable ferromagnet-like spin transport without net magnetization. We study the spin Seebeck effect in a compensated ferrimagnet/normal-metal junction using a four-sublattice model in which sublattice inequivalence arises from differences in exchange couplings, in contrast to the previously studied anisotropy-based mechanism. Within the nonequilibrium Green's function framework, we show that isotropic magnon splitting generates a robust spin current with a magnitude comparable to that in standard ferromagnetic junctions. We also demonstrate that the spin Seebeck effect vanishes in altermagnet junctions under identical conditions, thereby establishing compensated ferrimagnets as uniquely suited for thermal spin-current generation among magnetically compensated systems. These results provide a theoretical basis for the applications of compensated ferrimagnets with exchange-coupling asymmetry as stray-field-free spin-current sources in spintronic devices. |
| title | Spin Seebeck effect in magnetic junctions with a compensated ferrimagnet |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2605.09885 |