Femtosecond Engineering of magnetic Domain Walls via Nonequilibrium Spin Textures
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866916867230138368 |
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| author | Fan, Yuzhu Cao, Gaolong Wang, Junlin Jiang, Sheng Wu, Jing Åkerman, Johan Weissenrieder, Jonas |
| author_facet | Fan, Yuzhu Cao, Gaolong Wang, Junlin Jiang, Sheng Wu, Jing Åkerman, Johan Weissenrieder, Jonas |
| contents | Ultrafast optical control of magnetic textures offers new opportunities for energy-efficient, high-speed spintronic devices. While uniform magnetization reversal via all-optical switching is well established, the formation dynamics of non-uniform domain walls (DWs) under ultrafast excitation remain poorly understood. Here, we use Lorentz ultrafast electron microscopy combined with transient optical grating excitation to directly image the real-time formation of DWs in a ferrimagnetic GdFeCo film. We observe a rapid evolution from disordered spin contrast to ordered DW arrays within 10 ps, including a transient, strongly asymmetric DW state. In a narrow fluence window, short-lived DWs form and spontaneously vanish within picoseconds. Multiscale simulations combining atomistic spin dynamics and micromagnetics reveal a nonlinear nucleation pathway involving a hybrid transition state where localized, unstable spin textures coalesce into metastable DWs. This nonequilibrium mechanism explains the observed asymmetry and spatial ordering, and establishes a framework for controlling spin textures in magnetic materials on femtosecond timescales. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_20701 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Femtosecond Engineering of magnetic Domain Walls via Nonequilibrium Spin Textures Fan, Yuzhu Cao, Gaolong Wang, Junlin Jiang, Sheng Wu, Jing Åkerman, Johan Weissenrieder, Jonas Applied Physics Other Condensed Matter Ultrafast optical control of magnetic textures offers new opportunities for energy-efficient, high-speed spintronic devices. While uniform magnetization reversal via all-optical switching is well established, the formation dynamics of non-uniform domain walls (DWs) under ultrafast excitation remain poorly understood. Here, we use Lorentz ultrafast electron microscopy combined with transient optical grating excitation to directly image the real-time formation of DWs in a ferrimagnetic GdFeCo film. We observe a rapid evolution from disordered spin contrast to ordered DW arrays within 10 ps, including a transient, strongly asymmetric DW state. In a narrow fluence window, short-lived DWs form and spontaneously vanish within picoseconds. Multiscale simulations combining atomistic spin dynamics and micromagnetics reveal a nonlinear nucleation pathway involving a hybrid transition state where localized, unstable spin textures coalesce into metastable DWs. This nonequilibrium mechanism explains the observed asymmetry and spatial ordering, and establishes a framework for controlling spin textures in magnetic materials on femtosecond timescales. |
| title | Femtosecond Engineering of magnetic Domain Walls via Nonequilibrium Spin Textures |
| topic | Applied Physics Other Condensed Matter |
| url | https://arxiv.org/abs/2507.20701 |