Observation by SANS and PNR of pure Néel-type domain wall profiles and skyrmion suppression below room temperature in magnetic [Pt/CoFeB/Ru]10 multilayers
We report investigations of the magnetic textures in periodic multilayers [Pt(1 nm)/(CoFeB(0.8 nm)/Ru(1.4 nm)]10 using polarised neutron reflectometry (PNR) and small-angle neutron scattering (SANS). The multilayers are known to host skyrmions stabilized by Dzyaloshinskii-Moriya interactions induced...
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Taylor & Francis Group
2024-12-01
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| Series: | Science and Technology of Advanced Materials |
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| Online Access: | https://www.tandfonline.com/doi/10.1080/14686996.2024.2315015 |
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| author | Victor Ukleev Fernando Ajejas Anton Devishvili Alexei Vorobiev Nina-Juliane Steinke Robert Cubitt Chen Luo Radu-Marius Abrudan Florin Radu Vincent Cros Nicolas Reyren Jonathan S. White |
| author_facet | Victor Ukleev Fernando Ajejas Anton Devishvili Alexei Vorobiev Nina-Juliane Steinke Robert Cubitt Chen Luo Radu-Marius Abrudan Florin Radu Vincent Cros Nicolas Reyren Jonathan S. White |
| author_sort | Victor Ukleev |
| collection | DOAJ |
| description | We report investigations of the magnetic textures in periodic multilayers [Pt(1 nm)/(CoFeB(0.8 nm)/Ru(1.4 nm)]10 using polarised neutron reflectometry (PNR) and small-angle neutron scattering (SANS). The multilayers are known to host skyrmions stabilized by Dzyaloshinskii-Moriya interactions induced by broken inversion symmetry and spin–orbit coupling at the asymmetric interfaces. From depth-dependent PNR measurements, we observed well-defined structural features and obtained the layer-resolved magnetization profiles. The in-plane magnetization of the CoFeB layers calculated from fitting of the PNR profiles is found to be in excellent agreement with magnetometry data. Using SANS as a bulk probe of the entire multilayer, we observe long-period magnetic stripe domains and skyrmion ensembles with full orientational disorder at room temperature. No sign of skyrmions is found below 250 K, which we suggest is due to an increase of an effective magnetic anisotropy in the CoFeB layer on cooling that suppresses skyrmion stability. Using polarised SANS at room temperature, we prove the existence of pure Néel-type windings in both stripe domain and skyrmion regimes. No Bloch-type winding admixture, i.e. an indication for hybrid windings, is detected within the measurement sensitivity, in good agreement with expectations according to our micromagnetic modelling of the multilayers. Our findings using neutron techniques provide valuable microscopic insights into the rich magnetic behavior of skyrmion-hosting multilayers, which are essential for the advancement of future skyrmion-based spintronic devices. |
| format | Article |
| id | doaj-art-dbd96d09b0f74a93b471a13cdca75f9e |
| institution | Kabale University |
| issn | 1468-6996 1878-5514 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Taylor & Francis Group |
| record_format | Article |
| series | Science and Technology of Advanced Materials |
| spelling | doaj-art-dbd96d09b0f74a93b471a13cdca75f9e2024-12-23T08:54:39ZengTaylor & Francis GroupScience and Technology of Advanced Materials1468-69961878-55142024-12-0125110.1080/14686996.2024.2315015Observation by SANS and PNR of pure Néel-type domain wall profiles and skyrmion suppression below room temperature in magnetic [Pt/CoFeB/Ru]10 multilayersVictor Ukleev0Fernando Ajejas1Anton Devishvili2Alexei Vorobiev3Nina-Juliane Steinke4Robert Cubitt5Chen Luo6Radu-Marius Abrudan7Florin Radu8Vincent Cros9Nicolas Reyren10Jonathan S. White11Laboratory for Neutron Scattering and Imaging (LNS), Paul Scherrer Institute (PSI), Villigen, SwitzerlandLaboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, FranceInstitut Laue-Langevin, Grenoble, FranceInstitut Laue-Langevin, Grenoble, FranceInstitut Laue-Langevin, Grenoble, FranceInstitut Laue-Langevin, Grenoble, FranceHelmholtz-Zentrum Berlin für Materialien und Energie, Berlin, GermanyHelmholtz-Zentrum Berlin für Materialien und Energie, Berlin, GermanyHelmholtz-Zentrum Berlin für Materialien und Energie, Berlin, GermanyLaboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, FranceLaboratoire Albert Fert, CNRS, Thales, Université Paris-Saclay, Palaiseau, FranceLaboratory for Neutron Scattering and Imaging (LNS), Paul Scherrer Institute (PSI), Villigen, SwitzerlandWe report investigations of the magnetic textures in periodic multilayers [Pt(1 nm)/(CoFeB(0.8 nm)/Ru(1.4 nm)]10 using polarised neutron reflectometry (PNR) and small-angle neutron scattering (SANS). The multilayers are known to host skyrmions stabilized by Dzyaloshinskii-Moriya interactions induced by broken inversion symmetry and spin–orbit coupling at the asymmetric interfaces. From depth-dependent PNR measurements, we observed well-defined structural features and obtained the layer-resolved magnetization profiles. The in-plane magnetization of the CoFeB layers calculated from fitting of the PNR profiles is found to be in excellent agreement with magnetometry data. Using SANS as a bulk probe of the entire multilayer, we observe long-period magnetic stripe domains and skyrmion ensembles with full orientational disorder at room temperature. No sign of skyrmions is found below 250 K, which we suggest is due to an increase of an effective magnetic anisotropy in the CoFeB layer on cooling that suppresses skyrmion stability. Using polarised SANS at room temperature, we prove the existence of pure Néel-type windings in both stripe domain and skyrmion regimes. No Bloch-type winding admixture, i.e. an indication for hybrid windings, is detected within the measurement sensitivity, in good agreement with expectations according to our micromagnetic modelling of the multilayers. Our findings using neutron techniques provide valuable microscopic insights into the rich magnetic behavior of skyrmion-hosting multilayers, which are essential for the advancement of future skyrmion-based spintronic devices.https://www.tandfonline.com/doi/10.1080/14686996.2024.2315015Magnetic multilayersskyrmionssmall-angle neutron scatteringneutron reflectometryNéel-type domain walls |
| spellingShingle | Victor Ukleev Fernando Ajejas Anton Devishvili Alexei Vorobiev Nina-Juliane Steinke Robert Cubitt Chen Luo Radu-Marius Abrudan Florin Radu Vincent Cros Nicolas Reyren Jonathan S. White Observation by SANS and PNR of pure Néel-type domain wall profiles and skyrmion suppression below room temperature in magnetic [Pt/CoFeB/Ru]10 multilayers Science and Technology of Advanced Materials Magnetic multilayers skyrmions small-angle neutron scattering neutron reflectometry Néel-type domain walls |
| title | Observation by SANS and PNR of pure Néel-type domain wall profiles and skyrmion suppression below room temperature in magnetic [Pt/CoFeB/Ru]10 multilayers |
| title_full | Observation by SANS and PNR of pure Néel-type domain wall profiles and skyrmion suppression below room temperature in magnetic [Pt/CoFeB/Ru]10 multilayers |
| title_fullStr | Observation by SANS and PNR of pure Néel-type domain wall profiles and skyrmion suppression below room temperature in magnetic [Pt/CoFeB/Ru]10 multilayers |
| title_full_unstemmed | Observation by SANS and PNR of pure Néel-type domain wall profiles and skyrmion suppression below room temperature in magnetic [Pt/CoFeB/Ru]10 multilayers |
| title_short | Observation by SANS and PNR of pure Néel-type domain wall profiles and skyrmion suppression below room temperature in magnetic [Pt/CoFeB/Ru]10 multilayers |
| title_sort | observation by sans and pnr of pure neel type domain wall profiles and skyrmion suppression below room temperature in magnetic pt cofeb ru 10 multilayers |
| topic | Magnetic multilayers skyrmions small-angle neutron scattering neutron reflectometry Néel-type domain walls |
| url | https://www.tandfonline.com/doi/10.1080/14686996.2024.2315015 |
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