Publication: In-plane Neel wall chirality and orientation of interfacial Dzyaloshinskii-Moriya vector in magnetic films
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2020-07-14
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American Physical Society
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Abstract
The interfacial Dzyaloshinskii-Moriya interaction (DMI) is of great interest as it can stabilize chiral spin structures in thin films. Experiments verifying the orientation of the interfacial DMI vector remain rare, in part due to the difficulty of separating vector components of DMI. In this study, Fe/Ni bilayers and Co/Ni multilayers were deposited epitaxially onto Cu(001) and Pt(111) substrates, respectively. By tailoring the effective anisotropy, spin reorientation transitions (SRTs) are employed to probe the orientation of the DMI vector by measuring the spin structure of domain walls on both sides of the SRTs. The interfacial DMI is found to be sufficiently strong to stabilize chiral Neel walls in the out-of-plane magnetized regimes, while achiral Neel walls are observed in the in-plane magnetized regimes. These findings experimentally confirm that the out-of-plane component of the DMI vector is insignificant in these fcc(001) and fcc(111) oriented interfaces, even in the presence of atomic steps.
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©2020 American Physical Society
This work has been supported by the NSF (Grants No. DMR-1610060 and No. DMR-1905468) and the UC Office of the President Multicampus Research Programs and Initiatives (Grant No. MRP-17-454963). Work at the Molecular Foundry was supported by the Office of Science, Office of Basic Energy Sciences, of the US Department of Energy under Contract No. DE-AC02-05CH11231. Work at GU has been supported in part by SMART (Grant No. 2018-NE-2861), one of seven centers of nCORE, a Semiconductor Research Corporation program, sponsored by National Institute of Standards and Technology (NIST). Work at the Kyung Hee University been supported by the National Research Foundation of Korea funded by the Korean Government (Grant No. NRF-2018R1D1A1B07047114). A.M. acknowledges support from the MINECO under the Project No. MAT2017-87072C4-2-P and from Comunidad de Madrid under the Project No. S2018/NMT4321. E.G.M acknowledges support from MICINN (Spain) under Grant No. FIS2017-82415-R and from MECD (Spain) under Grant No. PRX17/00557. Y.W. acknowledges support from National Natural Science Foundation of China (Grants No. 11974079 and No. 11734006).