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Simultaneous tuning of magnetocrystalline anisotropy and spin reorientation transition via Cu substitution in Mn-Ni-Ga magnets for nanoscale biskyrmion formation

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posted on 2024-11-16, 05:09 authored by Guizhou Xu, Yurong You, Jiaxuan Tang, Hongguo Zhang, Hang Li, Xuefei Miao, Yuanyuan Gong, Zhipeng Hou, Zhenxiang ChengZhenxiang Cheng, Jianli WangJianli Wang, Andrew J Studer, Feng Xu, Wenhong Wang
Skyrmions with multiple helicity or topology in centrosymmetric crystals are intriguing magnetic-domain objects due to their diverse dynamics under external stimuli. Here we illustrate how the two key gradients of magnetocrystalline anisotropy (MCA) and spin reorientation transition (SRT) affect the skyrmion formation and topology by Cu substitution in the biskyrmion-host MnNiGa alloy. The MCA and SRT are simultaneously tuned in a large scope, while the original high Curie temperature (TC) is retained. Detailed neutron-scattering studies revealed the construction of a noncollinear canted magnetic structure below the SRT temperature (TSR), which effectively correlates the SRT with the evolution of the MCA, as well as the exchange interaction. The Cu substitution raises the TSR to merge with the TC, and meanwhile, reduces the c-axis anisotropy. Lorentz transmission electron microscopy revealed the formation of stacked biskyrmions from above room temperature to lower temperatures in MnNi1-xCuxGa(x=0-0.3) in the presence of proper MCA. Micromagnetic simulations further confirmed the great effect of uniaxial anisotropy on the stabilization of biskyrmions. Our work has helped clarify the evolution of magnetic structures and their correlation to the SRT, providing an account of the effect of MCA and exchange interaction on the biskyrmion formation.

Funding

Magnetic skyrmion materials for next generation spintronic-based devices

Australian Research Council

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Citation

Xu, G., You, Y., Tang, J., Zhang, H., Li, H., Miao, X., Gong, Y., Hou, Z., Cheng, Z., Wang, J., Studer, A. J., Xu, F. & Wang, W. (2019). Simultaneous tuning of magnetocrystalline anisotropy and spin reorientation transition via Cu substitution in Mn-Ni-Ga magnets for nanoscale biskyrmion formation. Physical Review B: Covering condensed matter and materials physics, 100 (5), 054416-1-054416-8.

Journal title

Physical Review B

Volume

100

Issue

5

Language

English

RIS ID

138280

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