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

Guizhou Xu; Yurong You; Jiaxuan Tang; Hongguo Zhang; Hang Li; Xuefei Miao; Yuanyuan Gong; Zhipeng Hou; Zhenxiang Cheng; Jianli Wang; Andrew J. Studer; Feng Xu; Wenhong Wang

doi:10.1103/physrevb.100.054416

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

Guizhou Xu, Yurong You, Jiaxuan Tang, Hongguo Zhang, Hang Li, Xuefei Miao, Yuanyuan Gong, Zhipeng Hou, Zhenxiang Cheng, Jianli Wang, Andrew J. Studer, Feng Xu, Wenhong Wang

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Abstract

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.

Original language	English (US)
Journal	Physical Review B
Volume	100
Issue number	5
DOIs	https://doi.org/10.1103/physrevb.100.054416
State	Published - Aug 13 2019
Externally published	Yes

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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, 100(5). https://doi.org/10.1103/physrevb.100.054416

@article{bf1c05f03d1249aea52cf15ff4cf14a6,

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

abstract = "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.",

author = "Guizhou Xu and Yurong You and Jiaxuan Tang and Hongguo Zhang and Hang Li and Xuefei Miao and Yuanyuan Gong and Zhipeng Hou and Zhenxiang Cheng and Jianli Wang and Studer, {Andrew J.} and Feng Xu and Wenhong Wang",

note = "KAUST Repository Item: Exported on 2021-03-31 Acknowledgements: This work was supported by the National Natural Science Foundation of China (Grant No. 11604148), the National Key R&D Program of China (Grant No. 2017YFA0303202), and the Key Research Program of the Chinese Academy of Sciences, KJZD-SW-M01. Z.X.C. thanks the Australia Research Council for support (DP190100150). We also would like to acknowledge Dr. Junye Yang at the Paul Scherrer Institute, Switzerland, and Dr. Qiang Zhang at King Abdullah University of Science and Technology (KAUST), Saudi Arabia, for technical support and helpful discussions. This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

year = "2019",

month = aug,

day = "13",

doi = "10.1103/physrevb.100.054416",

language = "English (US)",

volume = "100",

journal = "Physical Review B",

issn = "2469-9950",

publisher = "American Institute of Physics",

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TY - JOUR

T1 - Simultaneous tuning of magnetocrystalline anisotropy and spin reorientation transition via Cu substitution in Mn-Ni-Ga magnets for nanoscale biskyrmion formation

AU - Xu, Guizhou

AU - You, Yurong

AU - Tang, Jiaxuan

AU - Zhang, Hongguo

AU - Li, Hang

AU - Miao, Xuefei

AU - Gong, Yuanyuan

AU - Hou, Zhipeng

AU - Cheng, Zhenxiang

AU - Wang, Jianli

AU - Studer, Andrew J.

AU - Xu, Feng

AU - Wang, Wenhong

N1 - KAUST Repository Item: Exported on 2021-03-31 Acknowledgements: This work was supported by the National Natural Science Foundation of China (Grant No. 11604148), the National Key R&D Program of China (Grant No. 2017YFA0303202), and the Key Research Program of the Chinese Academy of Sciences, KJZD-SW-M01. Z.X.C. thanks the Australia Research Council for support (DP190100150). We also would like to acknowledge Dr. Junye Yang at the Paul Scherrer Institute, Switzerland, and Dr. Qiang Zhang at King Abdullah University of Science and Technology (KAUST), Saudi Arabia, for technical support and helpful discussions. This publication acknowledges KAUST support, but has no KAUST affiliated authors.

PY - 2019/8/13

Y1 - 2019/8/13

N2 - 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.

AB - 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.

UR - http://hdl.handle.net/10754/668386

UR - https://link.aps.org/doi/10.1103/PhysRevB.100.054416

UR - http://www.scopus.com/inward/record.url?scp=85070602672&partnerID=8YFLogxK

U2 - 10.1103/physrevb.100.054416

DO - 10.1103/physrevb.100.054416

M3 - Article

SN - 2469-9950

VL - 100

JO - Physical Review B

JF - Physical Review B

IS - 5

ER -

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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