Ultrafast Spin Accumulations Drive Magnetization Reversal in Multilayers
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866918321385897984 |
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| author | Singh, Harjinder Anadón, Alberto Igarashi, Junta Remy, Quentin Mangin, Stéphane Hehn, Michel Gorchon, Jon Malinowski, Gregory |
| author_facet | Singh, Harjinder Anadón, Alberto Igarashi, Junta Remy, Quentin Mangin, Stéphane Hehn, Michel Gorchon, Jon Malinowski, Gregory |
| contents | Engineering and controlling heat and spin transport on the femtosecond time-scale in spintronic devices opens up new ways to manipulate magnetization with unprecedented speed. Yet the underlying reversal mechanisms remain poorly understood due to the challenges of probing ultrafast, non-equilibrium spin dynamics. In this study, we demonstrate that typical magneto-optical experiments can be leveraged to access the time evolution of the spin accumulation generated within a magnetic multilayer following an ultrafast laser excitation. Furthermore, our analysis shows that the final magnetic state of the free-layer in a spin-valve is mainly dictated by the ultrafast dynamics of the reference-layer magnetization. Our results disentangle magnetization and spin transport dynamics within a multilayer stack and identify demagnetization and remagnetization-driven spin accumulation as the key mechanism for all-optical switching. These findings establish new design principles for ultrafast spintronic devices based on tailored spin current engineering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_19675 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Ultrafast Spin Accumulations Drive Magnetization Reversal in Multilayers Singh, Harjinder Anadón, Alberto Igarashi, Junta Remy, Quentin Mangin, Stéphane Hehn, Michel Gorchon, Jon Malinowski, Gregory Mesoscale and Nanoscale Physics Materials Science Engineering and controlling heat and spin transport on the femtosecond time-scale in spintronic devices opens up new ways to manipulate magnetization with unprecedented speed. Yet the underlying reversal mechanisms remain poorly understood due to the challenges of probing ultrafast, non-equilibrium spin dynamics. In this study, we demonstrate that typical magneto-optical experiments can be leveraged to access the time evolution of the spin accumulation generated within a magnetic multilayer following an ultrafast laser excitation. Furthermore, our analysis shows that the final magnetic state of the free-layer in a spin-valve is mainly dictated by the ultrafast dynamics of the reference-layer magnetization. Our results disentangle magnetization and spin transport dynamics within a multilayer stack and identify demagnetization and remagnetization-driven spin accumulation as the key mechanism for all-optical switching. These findings establish new design principles for ultrafast spintronic devices based on tailored spin current engineering. |
| title | Ultrafast Spin Accumulations Drive Magnetization Reversal in Multilayers |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2508.19675 |