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Title: Evolution of topological skyrmions across the spin reorientation transition in Pt/Co/Ta multilayers

Abstract

Magnetic skyrmions in multilayers are particularly appealing as next generation memory devices due to their topological compact size, the robustness against external perturbations, the capability of electrical driving and detection, and the compatibility with the existing spintronic technologies. To date, Néel-type skyrmions at room temperature (RT) have been studied mostly in multilayers with easy-axis magnetic anisotropy. Here in this paper, we systematically broadened the evolution of magnetic skyrmions with sub-50-nm size in a series of Pt/Co/Ta multilayers where the magnetic anisotropy is tuned continuously from easy axis to easy plane by increasing the ferromagnetic Co layer thickness. The existence of nontrivial skyrmions is identified via the combination of in situ Lorentz transmission electron microscopy (L-TEM) and Hall transport measurements. A high density of magnetic skyrmions over a wide temperature range is observed in the multilayers with easy-plane anisotropy, which will stimulate further exploration for new materials and accelerate the development of skyrmion-based spintronic devices.

Authors:
 [1];  [1];  [1];  [2];  [1];  [1];  [1];  [2];  [2];  [3];  [4];  [5];  [1];  [2];  [1];  [1]
+ Show Author Affiliations
  1. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics; Univ. of Chinese Academy of Sciences, Beijing (China). School of Physical Sciences
  2. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics, Inst. of Physics
  3. Univ. of Florida, Gainesville, FL (United States). Dept. of Physics and the Quantum Theory Project
  4. Beijing Normal Univ., Beijing (China). Inst. of Advanced Materials
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1479959
Report Number(s):
LA-UR-18-24332
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 17; 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; Material Science

Citation Formats

He, Min, Li, Gang, Zhu, Zhaozhao, Zhang, Ying, Peng, Licong, Li, Rui, Li, Jianqi, Wei, Hongxiang, Zhao, Tongyun, Zhang, X. -G., Wang, Shouguo, Lin, Shi-Zeng, Gu, Lin, Yu, Guoqiang, Cai, J. W., and Shen, Bao-gen. Evolution of topological skyrmions across the spin reorientation transition in Pt/Co/Ta multilayers. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.174419.
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He, Min, Li, Gang, Zhu, Zhaozhao, Zhang, Ying, Peng, Licong, Li, Rui, Li, Jianqi, Wei, Hongxiang, Zhao, Tongyun, Zhang, X. -G., Wang, Shouguo, Lin, Shi-Zeng, Gu, Lin, Yu, Guoqiang, Cai, J. W., & Shen, Bao-gen. Evolution of topological skyrmions across the spin reorientation transition in Pt/Co/Ta multilayers. United States. https://doi.org/10.1103/PhysRevB.97.174419
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He, Min, Li, Gang, Zhu, Zhaozhao, Zhang, Ying, Peng, Licong, Li, Rui, Li, Jianqi, Wei, Hongxiang, Zhao, Tongyun, Zhang, X. -G., Wang, Shouguo, Lin, Shi-Zeng, Gu, Lin, Yu, Guoqiang, Cai, J. W., and Shen, Bao-gen. Mon . "Evolution of topological skyrmions across the spin reorientation transition in Pt/Co/Ta multilayers". United States. https://doi.org/10.1103/PhysRevB.97.174419. https://www.osti.gov/servlets/purl/1479959.
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@article{osti_1479959,
title = {Evolution of topological skyrmions across the spin reorientation transition in Pt/Co/Ta multilayers},
author = {He, Min and Li, Gang and Zhu, Zhaozhao and Zhang, Ying and Peng, Licong and Li, Rui and Li, Jianqi and Wei, Hongxiang and Zhao, Tongyun and Zhang, X. -G. and Wang, Shouguo and Lin, Shi-Zeng and Gu, Lin and Yu, Guoqiang and Cai, J. W. and Shen, Bao-gen},
abstractNote = {Magnetic skyrmions in multilayers are particularly appealing as next generation memory devices due to their topological compact size, the robustness against external perturbations, the capability of electrical driving and detection, and the compatibility with the existing spintronic technologies. To date, Néel-type skyrmions at room temperature (RT) have been studied mostly in multilayers with easy-axis magnetic anisotropy. Here in this paper, we systematically broadened the evolution of magnetic skyrmions with sub-50-nm size in a series of Pt/Co/Ta multilayers where the magnetic anisotropy is tuned continuously from easy axis to easy plane by increasing the ferromagnetic Co layer thickness. The existence of nontrivial skyrmions is identified via the combination of in situ Lorentz transmission electron microscopy (L-TEM) and Hall transport measurements. A high density of magnetic skyrmions over a wide temperature range is observed in the multilayers with easy-plane anisotropy, which will stimulate further exploration for new materials and accelerate the development of skyrmion-based spintronic devices.},
doi = {10.1103/PhysRevB.97.174419},
journal = {Physical Review B},
number = 17,
volume = 97,
place = {United States},
year = {Mon May 21 00:00:00 EDT 2018},
month = {Mon May 21 00:00:00 EDT 2018}
}
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Journal Article:
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https://doi.org/10.1103/PhysRevB.97.174419
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Cited by: 34 works
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Figures / Tables:

FIG. 1 FIG. 1: The magnetic anisotropy together with the corresponding skyrmion distribution in Pt/Co/Ta multilayers. (a) Top: The DMI for two magnetic atoms (grey spheres) close to an atom (blue sphere) with a large spin–orbit coupling. Bottom: schematic multilayers made of six repetitions of the Pt/Co/Ta trilayer. (b)-(d) Room-temperature magnetic hysteresismore » loops measured along the in-plane and out-of-plane directions respectively. Each loop is normalized to saturate magnetization. (e)-(g) Magnetic skyrmion distribution while completely evolved from stripe domain at the magnetic fields of 680, 930 and 1040 Oe, respectively. The skyrmion density gets higher with thicker Co layer. The scale bar in (e)-(g) is 200 nm.« less
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    Works referencing / citing this record:

    Spontaneous nanometric magnetic bubbles with various topologies in spin-reoriented La 1−x Sr x MnO 3
    journal, October 2018

    • Peng, Licong; Zhang, Ying; Hong, Deshun
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    Direct imaging of an inhomogeneous electric current distribution using the trajectory of magnetic half-skyrmions
    journal, February 2020

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