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Proximity-induced flipped spin state in synthetic ferrimagnetic Pt/Co/Gd heterolayers
Ctr Nacl Pesquisa Energia & Mat, Lab Nacl Luz Sincrotron, Campinas, SP, Brazil..
Univ Sao Paulo, Inst Fis, Sao Paulo, SP, Brazil..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. Linnaeus Univ, Dept Phys & Elect Engn, Kalmar, Sweden.ORCID iD: 0000-0003-1018-9647
Ctr Nacl Pesquisa Energia & Mat, Lab Nacl Luz Sincrotron, Campinas, SP, Brazil..
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2025 (English)In: Communications Physics, E-ISSN 2399-3650, Vol. 8, no 1, article id 22Article in journal (Refereed) Published
Abstract [en]

To develop new devices based on synthetic ferrimagnetic heterostructures, understanding the material's physical properties is pivotal. Here, the induced magnetic moment (IMM), magnetic exchange coupling, and spin textures are investigated in Pt(1 nm)/Co(1.5 nm)/Gd(1 nm) multilayers using a multiscale approach. The magnitude and direction of the IMM are interpreted in the framework of both X-ray magnetic circular dichroism and density functional theory. The IMM transferred by Co across the Gd paramagnetic thickness leads to a nontrivial flipped spin state (FSS) within the Gd layers, in which their magnetic moments couple antiparallel/parallel with the ferromagnetic Co near/far from the Co/Gd interface, respectively. The FSS depends on the magnetic field, which, on average, reduces the Gd magnetic moment as the field increases. For the Pt, in both Pt/Co and Gd/Pt interfaces, the IMM follows the same direction as the Co magnetic moment, with negligible IMM in the Gd/Pt interface. Additionally, zero-field spin spirals were imaged using scanning transmission X-ray microscopy, whereas micromagnetic simulations were employed to unfold the interactions, stabilizing the ferrimagnetic configurations, where the existence of a sizable Dzyaloshinskii-Moriya interaction is demonstrated to be crucial.

Place, publisher, year, edition, pages
Springer Nature, 2025. Vol. 8, no 1, article id 22
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Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-548453DOI: 10.1038/s42005-025-01938-0ISI: 001396256900001OAI: oai:DiVA.org:uu-548453DiVA, id: diva2:1931513
Funder
Knut and Alice Wallenberg FoundationSwedish Research Council, 2022-06725eSSENCE - An eScience CollaborationThe Crafoord Foundation, 20231063National Academic Infrastructure for Supercomputing in Sweden (NAISS)Linnaeus UniversityAvailable from: 2025-01-27 Created: 2025-01-27 Last updated: 2025-01-27Bibliographically approved

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Miranda, Ivan P.Bergman, Anders

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