A three-dimensional breakdown behavior of the magnetic Bloch-point domain wall (BP-DW) propagation was investigated in a ferromagnetic nanowire with the variation of the external magnetic field by means of micromagnetic simulation. As magnetic field strength increases up to a threshold value, the BP-DW velocity approaches a critical phase velocity of the spontaneously emitting spin wave (SW), where a Cherenkov-type DW breakdown phenomenon is observed originating from an interaction between the spontaneously emitting SW and the BP-DW. It is found that the velocity of the BP-DW approaches a maximum value (∼2000 m/s) due to the intrinsic reversal time of a BP spin texture. This suggests that although cylindrical ferromagnetic nanowires might be free from the two-dimensional Walker breakdown phenomenon, there exists a Cherenkov-type three-dimensional breakdown behavior.
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Cherenkov-type three-dimensional breakdown behavior of the Bloch-point domain wall motion in the cylindrical nanowire
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10 August 2020
Research Article|
August 11 2020
Cherenkov-type three-dimensional breakdown behavior of the Bloch-point domain wall motion in the cylindrical nanowire
Xiao-Ping Ma
;
Xiao-Ping Ma
1
Research Institute for Magnetoelectronis and Weak Magnetic-Field Detection, College of Science, China Three Gorges University
, Yichang 443002, People's Republic of China
2
Department of Physics, Chungbuk National University
, Cheongju 28644, South Korea
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Jiangshan Zheng;
Jiangshan Zheng
1
Research Institute for Magnetoelectronis and Weak Magnetic-Field Detection, College of Science, China Three Gorges University
, Yichang 443002, People's Republic of China
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Hong-Guang Piao
;
Hong-Guang Piao
a)
1
Research Institute for Magnetoelectronis and Weak Magnetic-Field Detection, College of Science, China Three Gorges University
, Yichang 443002, People's Republic of China
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Dong-Hyun Kim
;
Dong-Hyun Kim
a)
2
Department of Physics, Chungbuk National University
, Cheongju 28644, South Korea
3
Research Institute for Nanoscale Science and Technology, Chungbuk National University
, Cheongju 28644, South Korea
4
Materials Sciences Division, Lawrence Berkeley National Laboratory
, Berkeley, California 94720, USA
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Peter Fischer
Peter Fischer
4
Materials Sciences Division, Lawrence Berkeley National Laboratory
, Berkeley, California 94720, USA
5
Department of Physics, University of California at Santa Cruz
, Santa Cruz, California 95064, USA
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Appl. Phys. Lett. 117, 062402 (2020)
Article history
Received:
May 08 2020
Accepted:
July 24 2020
Citation
Xiao-Ping Ma, Jiangshan Zheng, Hong-Guang Piao, Dong-Hyun Kim, Peter Fischer; Cherenkov-type three-dimensional breakdown behavior of the Bloch-point domain wall motion in the cylindrical nanowire. Appl. Phys. Lett. 10 August 2020; 117 (6): 062402. https://doi.org/10.1063/5.0013002
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