General nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understanding
We present a study of the magnetic configuration due to step-induced magnetic frustration at ferromagnetic/antiferromagnetic (FM/AFM) interfaces. At a substrate monatomic step edge, a 180° domain wall emerges. A physically appealing form for the thickness dependence of the domain wall width is obtai...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2019-01-01
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| Series: | New Journal of Physics |
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| Online Access: | https://doi.org/10.1088/1367-2630/ab5cbd |
| _version_ | 1797750380345425920 |
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| author | X Chen T Z Ji L Sun B F Miao Y T Millev H F Ding |
| author_facet | X Chen T Z Ji L Sun B F Miao Y T Millev H F Ding |
| author_sort | X Chen |
| collection | DOAJ |
| description | We present a study of the magnetic configuration due to step-induced magnetic frustration at ferromagnetic/antiferromagnetic (FM/AFM) interfaces. At a substrate monatomic step edge, a 180° domain wall emerges. A physically appealing form for the thickness dependence of the domain wall width is obtained. It follows a universal behaviour in the whole thickness range, from ultrathin film to bulk and in both cases of an AFM domain wall on top of the FM layer and a FM domain wall on top of an AFM substrate. In the ultrathin limit of the capping layer, the domain wall grows linearly with the slope depending only on the ratio of the inter-layer and intra-layer Heisenberg exchange constants, regardless of the presence of magneto-crystalline anisotropy. These findings are in good agreement with previous experimental observations. As the thickness grows beyond the ultrathin regime, the corresponding thickness dependence departs from linearity and tends to its bulk value. The analytical insights are supported by conclusive numerical simulations of two independent varieties, namely, the Monte Carlo method which also includes the growth kinetics and the object oriented micromagnetic framework based micromagnetic simulations. While the quantitative details of the study are naturally dependent on the specific material parameters of the complex magnetic system, the global features of the spin texture in the capping layer are dictated by the topological step-edge defect. The latter in itself is quantifiable by a winding number of $\pm \tfrac{1}{2}.$ |
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| language | English |
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| spelling | doaj.art-d85598a4396548b78cf36fe6500732ce2023-08-08T15:26:30ZengIOP PublishingNew Journal of Physics1367-26302019-01-01211212304510.1088/1367-2630/ab5cbdGeneral nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understandingX Chen0T Z Ji1L Sun2B F Miao3Y T Millev4https://orcid.org/0000-0002-2059-3275H F Ding5https://orcid.org/0000-0001-7524-0779National Laboratory of Solid State Microstructure, Department of Physics, Nanjing University , 22 Hankou Road, Nanjing 210093, People’s Republic of ChinaNational Laboratory of Solid State Microstructure, Department of Physics, Nanjing University , 22 Hankou Road, Nanjing 210093, People’s Republic of ChinaNational Laboratory of Solid State Microstructure, Department of Physics, Nanjing University , 22 Hankou Road, Nanjing 210093, People’s Republic of China; Collaborative Innovation Center of Advanced Microstructures, Nanjing University , 22 Hankou Road, Nanjing 210093, People’s Republic of ChinaNational Laboratory of Solid State Microstructure, Department of Physics, Nanjing University , 22 Hankou Road, Nanjing 210093, People’s Republic of China; Collaborative Innovation Center of Advanced Microstructures, Nanjing University , 22 Hankou Road, Nanjing 210093, People’s Republic of ChinaAmerican Physical Society, 1 Research Road, Ridge, NY 11961, United States of AmericaNational Laboratory of Solid State Microstructure, Department of Physics, Nanjing University , 22 Hankou Road, Nanjing 210093, People’s Republic of China; Collaborative Innovation Center of Advanced Microstructures, Nanjing University , 22 Hankou Road, Nanjing 210093, People’s Republic of ChinaWe present a study of the magnetic configuration due to step-induced magnetic frustration at ferromagnetic/antiferromagnetic (FM/AFM) interfaces. At a substrate monatomic step edge, a 180° domain wall emerges. A physically appealing form for the thickness dependence of the domain wall width is obtained. It follows a universal behaviour in the whole thickness range, from ultrathin film to bulk and in both cases of an AFM domain wall on top of the FM layer and a FM domain wall on top of an AFM substrate. In the ultrathin limit of the capping layer, the domain wall grows linearly with the slope depending only on the ratio of the inter-layer and intra-layer Heisenberg exchange constants, regardless of the presence of magneto-crystalline anisotropy. These findings are in good agreement with previous experimental observations. As the thickness grows beyond the ultrathin regime, the corresponding thickness dependence departs from linearity and tends to its bulk value. The analytical insights are supported by conclusive numerical simulations of two independent varieties, namely, the Monte Carlo method which also includes the growth kinetics and the object oriented micromagnetic framework based micromagnetic simulations. While the quantitative details of the study are naturally dependent on the specific material parameters of the complex magnetic system, the global features of the spin texture in the capping layer are dictated by the topological step-edge defect. The latter in itself is quantifiable by a winding number of $\pm \tfrac{1}{2}.$https://doi.org/10.1088/1367-2630/ab5cbddomain wallspin frustrationtopology |
| spellingShingle | X Chen T Z Ji L Sun B F Miao Y T Millev H F Ding General nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understanding New Journal of Physics domain wall spin frustration topology |
| title | General nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understanding |
| title_full | General nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understanding |
| title_fullStr | General nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understanding |
| title_full_unstemmed | General nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understanding |
| title_short | General nature of the step-induced frustration at ferromagnetic/antiferromagnetic interfaces: topological origin and quantitative understanding |
| title_sort | general nature of the step induced frustration at ferromagnetic antiferromagnetic interfaces topological origin and quantitative understanding |
| topic | domain wall spin frustration topology |
| url | https://doi.org/10.1088/1367-2630/ab5cbd |
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