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Title: Generation and Hall effect of skyrmions enabled using nonmagnetic point contacts

Abstract

The generation and manipulation of magnetic skyrmions are perquisites for any skyrmion-based information processing devices, where skyrmions are used as nonvolatile information carriers. In this work, we report experimentally the skyrmion generation through the usage of a nonmagnetic conducting Ti/Au point contact in a device made of a Ta/ CoFeB/TaO x trilayer film. Moreover, the accompanied topological charge-dependent skyrmion dynamics, namely the skyrmion Hall effect, is also observed in the same device. The creation process of a skyrmion has been numerically reproduced through micromagnetic simulations, in which the important role of the skyrmion-antiskyrmion pair formation is identified. The motion and Hall effect of a skyrmion, immediately after its creation, is described using a modified Thiele equation after taking into account the contribution from spatially inhomogeneous spin-orbit torques and the Magnus force. Our findings on the simultaneous generation and manipulation of skyrmions using a nonmagnetic point contact are useful for understanding the ultrafast dynamics of skyrmion creation, which could further offer an effective pathway for designing skyrmion-based devices.

Authors:
 [1];  [2];  [2];  [1];  [1];  [3];  [4];  [5];  [6];  [6];  [2]; ORCiD logo [1]
  1. Tsinghua Univ., Beijing (China)
  2. Chinese Univ. of Hong Kong, Guangdong (China)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Univ. of California, Los Angeles, CA (United States)
  5. Shinshu Univ., Nagano (Japan)
  6. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Natural Science Foundation of China (NNSFC); National Key R&D Program of China; Shenzhen Fundamental Research Fund
OSTI Identifier:
1578047
Grant/Contract Number:  
AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 100; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Wang, Zidong, Zhang, Xichao, Xia, Jing, Zhao, Le, Wu, Keyu, Yu, Guoqiang, Wang, Kang L., Liu, Xiaoxi, te Velthuis, Suzanne G. E., Hoffmann, Axel, Zhou, Yan, and Jiang, Wanjun. Generation and Hall effect of skyrmions enabled using nonmagnetic point contacts. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.184426.
Wang, Zidong, Zhang, Xichao, Xia, Jing, Zhao, Le, Wu, Keyu, Yu, Guoqiang, Wang, Kang L., Liu, Xiaoxi, te Velthuis, Suzanne G. E., Hoffmann, Axel, Zhou, Yan, & Jiang, Wanjun. Generation and Hall effect of skyrmions enabled using nonmagnetic point contacts. United States. doi:10.1103/PhysRevB.100.184426.
Wang, Zidong, Zhang, Xichao, Xia, Jing, Zhao, Le, Wu, Keyu, Yu, Guoqiang, Wang, Kang L., Liu, Xiaoxi, te Velthuis, Suzanne G. E., Hoffmann, Axel, Zhou, Yan, and Jiang, Wanjun. Wed . "Generation and Hall effect of skyrmions enabled using nonmagnetic point contacts". United States. doi:10.1103/PhysRevB.100.184426.
@article{osti_1578047,
title = {Generation and Hall effect of skyrmions enabled using nonmagnetic point contacts},
author = {Wang, Zidong and Zhang, Xichao and Xia, Jing and Zhao, Le and Wu, Keyu and Yu, Guoqiang and Wang, Kang L. and Liu, Xiaoxi and te Velthuis, Suzanne G. E. and Hoffmann, Axel and Zhou, Yan and Jiang, Wanjun},
abstractNote = {The generation and manipulation of magnetic skyrmions are perquisites for any skyrmion-based information processing devices, where skyrmions are used as nonvolatile information carriers. In this work, we report experimentally the skyrmion generation through the usage of a nonmagnetic conducting Ti/Au point contact in a device made of a Ta/ CoFeB/TaOx trilayer film. Moreover, the accompanied topological charge-dependent skyrmion dynamics, namely the skyrmion Hall effect, is also observed in the same device. The creation process of a skyrmion has been numerically reproduced through micromagnetic simulations, in which the important role of the skyrmion-antiskyrmion pair formation is identified. The motion and Hall effect of a skyrmion, immediately after its creation, is described using a modified Thiele equation after taking into account the contribution from spatially inhomogeneous spin-orbit torques and the Magnus force. Our findings on the simultaneous generation and manipulation of skyrmions using a nonmagnetic point contact are useful for understanding the ultrafast dynamics of skyrmion creation, which could further offer an effective pathway for designing skyrmion-based devices.},
doi = {10.1103/PhysRevB.100.184426},
journal = {Physical Review B},
number = 18,
volume = 100,
place = {United States},
year = {2019},
month = {11}
}

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