Journal
APPLIED PHYSICS LETTERS
Volume 120, Issue 17, Pages -Publisher
AIP Publishing
DOI: 10.1063/5.0089355
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Funding
- JSPS Kakenhi [19H05622, 20K22409, 21J23061]
- Iketani Science and Technology Foundation [0331108-A]
- Casio Science and Technology Foundation [39-11]
- RIEC Cooperative Research Projects
- GP-Spin at Tohoku University
- JST-OPERA
- Grants-in-Aid for Scientific Research [21J23061, 20K22409] Funding Source: KAKEN
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In this study, hysteresis-loop measurement and domain imaging were performed on (1 (1) over bar 00)-oriented D0(19)-Mn3+xSn1-x (-0.11 <= x <= 0.14) thin films using the magneto-optical Kerr effect (MOKE), and the results were compared with the anomalous Hall effect (AHE) measurement. The x dependence of AHE and MOKE showed a similar trend, indicating the same origin. Furthermore, the reversal process of the chiral-spin structure in non-collinear antiferromagnetic thin films was found to start with nucleation of sub-micrometer-scale domains and preferentially propagate along the [11(2) over bar 0] direction.
We perform hysteresis-loop measurement and domain imaging for ( 1 (1) over bar 00 )-oriented D0(19)-Mn3+xSn1-x (-0.11 <= x <= 0.14) thin films using the magneto-optical Kerr effect (MOKE) and compare it with the anomalous Hall effect (AHE) measurement. We obtain a large Kerr rotation angle of 10 mdeg, comparable with bulk single-crystal Mn3Sn. The composition x dependence of AHE and MOKE shows a similar trend, suggesting the same origin, i.e., the non-vanishing Berry curvature in the momentum space. Magnetic domain observation at the saturated state shows that x dependence of AHE and MOKE is explained by the amount of the reversible area that crucially depends on the crystalline structure of the film. Furthermore, in-depth observation of the reversal process reveals that the reversal starts with nucleation of sub-micrometer-scale domains dispersed in the film, followed by domain expansion, where the domain wall preferentially propagates along the [ 11(2) over bar 0 ] direction. Our study provides a basic understanding of the spatial evolution of the reversal of the chiral-spin structure in non-collinear antiferromagnetic thin films. Published under an exclusive license by AIP Publishing.
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