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- W4366459114 abstract "Resonant absorption of a photon by bound electrons in a solid can promote an electron to another orbital state or transfer it to a neighboring atomic site. Such a transition in a magnetically ordered material could affect the magnetic order. While this process is an obvious road map for optical control of magnetization, experimental demonstration of such a process remains challenging. Exciting a significant fraction of magnetic ions requires a very intense incoming light beam, as orbital resonances are often weak compared to above-band-gap excitations. In the latter case, a sizeable reduction of the magnetization occurs as the absorbed energy increases the spin temperature, masking the non-thermal optical effects. Here, using ultrafast x-ray spectroscopy, we were able to resolve changes in the magnetization state induced by resonant absorption of infrared photons in Co-doped yttrium iron garnet, with negligible thermal effects. We found that the optical excitation of the Co ions affects the two distinct magnetic Fe sublattices differently, resulting in a transient non-collinear magnetic state. The present results indicate that the all-optical magnetization switching most likely occurs due to the creation of a transient, non-collinear magnetic state followed by coherent spin rotations of the Fe moments." @default.
- W4366459114 created "2023-04-22" @default.
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- W4366459114 date "2023-04-18" @default.
- W4366459114 modified "2023-10-12" @default.
- W4366459114 title "Transient non-collinear magnetic state for all-optical magnetization switching" @default.
- W4366459114 doi "https://doi.org/10.48550/arxiv.2304.08890" @default.
- W4366459114 hasPublicationYear "2023" @default.
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