Proximity-induced flipped spin state in synthetic ferrimagnetic Pt/Co/Gd heterolayers
Abstract 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...
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Nature Portfolio
2025-01-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-025-01938-0 |
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| author | Jeovani Brandão Pamela C. Carvalho Ivan P. Miranda Thiago J. A. Mori Fanny Béron Anders Bergman Helena M. Petrilli Angela B. Klautau Julio C. Cezar |
| author_facet | Jeovani Brandão Pamela C. Carvalho Ivan P. Miranda Thiago J. A. Mori Fanny Béron Anders Bergman Helena M. Petrilli Angela B. Klautau Julio C. Cezar |
| author_sort | Jeovani Brandão |
| collection | DOAJ |
| description | Abstract 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. |
| format | Article |
| id | doaj-art-23bb84aab48f43ef9e871f15c452f048 |
| institution | Kabale University |
| issn | 2399-3650 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Physics |
| spelling | doaj-art-23bb84aab48f43ef9e871f15c452f0482025-01-19T12:26:23ZengNature PortfolioCommunications Physics2399-36502025-01-018111210.1038/s42005-025-01938-0Proximity-induced flipped spin state in synthetic ferrimagnetic Pt/Co/Gd heterolayersJeovani Brandão0Pamela C. Carvalho1Ivan P. Miranda2Thiago J. A. Mori3Fanny Béron4Anders Bergman5Helena M. Petrilli6Angela B. Klautau7Julio C. Cezar8Laboratório Nacional de Luz Síncrotron, Centro Nacional de Pesquisa em Energia e MateriaisUniversidade de São Paulo, Instituto de FísicaDepartment of Physics and Electrical Engineering, Linnaeus UniversityLaboratório Nacional de Luz Síncrotron, Centro Nacional de Pesquisa em Energia e MateriaisInstituto de Física Gleb Wataghin, Universidade Estadual de CampinasDepartment of Physics and Astronomy, Uppsala UniversityUniversidade de São Paulo, Instituto de FísicaFaculdade de Física, Universidade Federal do ParáLaboratório Nacional de Luz Síncrotron, Centro Nacional de Pesquisa em Energia e MateriaisAbstract 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.https://doi.org/10.1038/s42005-025-01938-0 |
| spellingShingle | Jeovani Brandão Pamela C. Carvalho Ivan P. Miranda Thiago J. A. Mori Fanny Béron Anders Bergman Helena M. Petrilli Angela B. Klautau Julio C. Cezar Proximity-induced flipped spin state in synthetic ferrimagnetic Pt/Co/Gd heterolayers Communications Physics |
| title | Proximity-induced flipped spin state in synthetic ferrimagnetic Pt/Co/Gd heterolayers |
| title_full | Proximity-induced flipped spin state in synthetic ferrimagnetic Pt/Co/Gd heterolayers |
| title_fullStr | Proximity-induced flipped spin state in synthetic ferrimagnetic Pt/Co/Gd heterolayers |
| title_full_unstemmed | Proximity-induced flipped spin state in synthetic ferrimagnetic Pt/Co/Gd heterolayers |
| title_short | Proximity-induced flipped spin state in synthetic ferrimagnetic Pt/Co/Gd heterolayers |
| title_sort | proximity induced flipped spin state in synthetic ferrimagnetic pt co gd heterolayers |
| url | https://doi.org/10.1038/s42005-025-01938-0 |
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