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Theory of superdiff...
Theory of superdiffusive spin transport in noncollinear magnetic multilayers
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- Balaz, Pavel (author)
- Inst Phys Czech Acad Sci, FZU, Slovance 1999-2, Prague 8, Czech Republic.
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- Zwierzycki, Maciej (author)
- Polish Acad Sci, Inst Mol Phys, Smoluchowskiego 17, PL-60179 Poznan, Poland.
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- Cosco, Francesco (author)
- Uppsala universitet,Institutionen för fysik och astronomi
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- Carva, Karel (author)
- Charles Univ Prague, Fac Math & Phys, Dept Condensed Matter Phys, Ke Karlovu 5, CZ-12116 Prague, Czech Republic.
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- Maldonado, Pablo (author)
- Uppsala universitet,Materialteori
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- Oppeneer, Peter M. (author)
- Uppsala universitet,Materialteori
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Inst Phys Czech Acad Sci, FZU, Slovance 1999-2, Prague 8, Czech Republic Polish Acad Sci, Inst Mol Phys, Smoluchowskiego 17, PL-60179 Poznan, Poland. (creator_code:org_t)
- American Physical Society, 2023
- 2023
- English.
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In: Physical Review B. - : American Physical Society. - 2469-9950 .- 2469-9969. ; 107:17
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
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- Ultrafast demagnetization induced by femtosecond laser pulses in thin metallic layers is caused by the outflow of spin-polarized hot-electron currents describable by the superdiffusive transport model. These laser-generated spin currents can cross the interface into another magnetic layer and give rise to magnetization dynamics in magnetic spin valves with noncollinear magnetizations. To describe ultrafast transport and spin dynamics in such nanostructures, we develop here the superdiffusive theory for general noncollinear magnetic multilayers. Specifically, we introduce an Al/Ni/Ru/Fe/Ru multilayer system with noncollinear Ni and Fe magnetic moments and analyze how the ultrafast demagnetization and spin-transfer torque depend on the noncollinearity. We employ ab initio calculations to compute the spin-and energy-dependent transmissions of hot electrons at the interfaces of the multilayer. Taking into account multiple electron scattering at interfaces and spin mixing in the spacer layer, we find that the laser-induced demagnetization of the Ni layer and the magnetization change of the Fe layer strongly depend on the angle between their magnetizations. Similarly, the spin-transfer torques on the Ni and Fe layers and the total spin momentum absorbed in the Ni and Fe layer are found to vary markedly with the amount of noncollinearity. These results suggest that by changing the amount of noncollinearity in magnetic multilayers, one can efficiently control the hot-electron spin transport, which may open a way toward achieving fast, laser-driven spintronic devices.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Publication and Content Type
- ref (subject category)
- art (subject category)
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