Topological spin memory of antiferromagnetically coupled skyrmion pairs in Co/Gd/Pt multilayers
Abstract
Antiferromagnetically (AFM) coupled skyrmions offer potential advantages for spintronic devices, including reduced dipolar fields that may enable smaller skyrmion sizes and a reduction of the skyrmion Hall effect. However, the topological stability of AFM-coupled skyrmions subjected to dramatic spin deformation through low-temperature cycling has not been investigated. We report the discovery of a topological spin memory effect for AFM-coupled skyrmion pairs in [Co/Gd/Pt](10) multilayered films. Photoemission electron microscopy imaging shows that bubble skyrmions in the multilayer that are stable at room temperature evolve into complex in-plane spin textures as the temperature is lowered and reform completely when the sample is warmed back up. Simulations demonstrate that Dzyaloshinskii-Moriya interactions play a key role in this spin memory effect, and furthermore reveal that the topological charge is preserved throughout the dramatic spin texture rearrangement and recovery. These results highlight a key aspect of topological protection-the preservation of the topological properties under continuous deformation-and also provide a promising avenue for information encryption and recovery.
- Authors:
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[1];
[1];
[4];
[6];
[5];
[5];
[8];
[2];
[1]
- Bryn Mawr College, PA (United States)
- Colorado State University, Fort Collins, CO (United States)
- Bryn Mawr College, PA (United States); Colorado State University, Fort Collins, CO (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS); University of California, Los Angeles, CA (United States)
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Argonne National Laboratory (ANL), Argonne, IL (United States); University of Illinois at Urbana-Champaign, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); National Science Foundation (NSF)
- OSTI Identifier:
- 1909622
- Grant/Contract Number:
- AC02-06CH11357; AC02-05CH11231; DMR 1708790; DMR 1709525
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Materials
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 8; Journal ID: ISSN 2475-9953
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; Dzyaloshinskii-Moriya interaction; skyrmions; spin texture; synthetic antiferromagnetic multilayers; micromagnetic modeling; x-ray magnetic circular dichroism; x-ray photoemission electron microscopy
Citation Formats
Wang, Xiao, Stuart, Alexandra R., Swyt, Mitchell S., Flores, Carla M. Quispe, Clark, Andy T., Fiagbenu, Adzo, Chopdekar, Rajesh V., Lapa, Pavel N., Xiao, Zhuyun, Keavney, Dava, Rosenberg, Richard, Vogel, Michael, Pearson, John E., Velthuis, Suzanne G. E. te, Hoffmann, Axel, Buchanan, Kristen S., and Cheng, Xuemei M. Topological spin memory of antiferromagnetically coupled skyrmion pairs in Co/Gd/Pt multilayers. United States: N. p., 2022.
Web. doi:10.1103/physrevmaterials.6.084412.
Wang, Xiao, Stuart, Alexandra R., Swyt, Mitchell S., Flores, Carla M. Quispe, Clark, Andy T., Fiagbenu, Adzo, Chopdekar, Rajesh V., Lapa, Pavel N., Xiao, Zhuyun, Keavney, Dava, Rosenberg, Richard, Vogel, Michael, Pearson, John E., Velthuis, Suzanne G. E. te, Hoffmann, Axel, Buchanan, Kristen S., & Cheng, Xuemei M. Topological spin memory of antiferromagnetically coupled skyrmion pairs in Co/Gd/Pt multilayers. United States. https://doi.org/10.1103/physrevmaterials.6.084412
Wang, Xiao, Stuart, Alexandra R., Swyt, Mitchell S., Flores, Carla M. Quispe, Clark, Andy T., Fiagbenu, Adzo, Chopdekar, Rajesh V., Lapa, Pavel N., Xiao, Zhuyun, Keavney, Dava, Rosenberg, Richard, Vogel, Michael, Pearson, John E., Velthuis, Suzanne G. E. te, Hoffmann, Axel, Buchanan, Kristen S., and Cheng, Xuemei M. Tue .
"Topological spin memory of antiferromagnetically coupled skyrmion pairs in Co/Gd/Pt multilayers". United States. https://doi.org/10.1103/physrevmaterials.6.084412. https://www.osti.gov/servlets/purl/1909622.
@article{osti_1909622,
title = {Topological spin memory of antiferromagnetically coupled skyrmion pairs in Co/Gd/Pt multilayers},
author = {Wang, Xiao and Stuart, Alexandra R. and Swyt, Mitchell S. and Flores, Carla M. Quispe and Clark, Andy T. and Fiagbenu, Adzo and Chopdekar, Rajesh V. and Lapa, Pavel N. and Xiao, Zhuyun and Keavney, Dava and Rosenberg, Richard and Vogel, Michael and Pearson, John E. and Velthuis, Suzanne G. E. te and Hoffmann, Axel and Buchanan, Kristen S. and Cheng, Xuemei M.},
abstractNote = {Antiferromagnetically (AFM) coupled skyrmions offer potential advantages for spintronic devices, including reduced dipolar fields that may enable smaller skyrmion sizes and a reduction of the skyrmion Hall effect. However, the topological stability of AFM-coupled skyrmions subjected to dramatic spin deformation through low-temperature cycling has not been investigated. We report the discovery of a topological spin memory effect for AFM-coupled skyrmion pairs in [Co/Gd/Pt](10) multilayered films. Photoemission electron microscopy imaging shows that bubble skyrmions in the multilayer that are stable at room temperature evolve into complex in-plane spin textures as the temperature is lowered and reform completely when the sample is warmed back up. Simulations demonstrate that Dzyaloshinskii-Moriya interactions play a key role in this spin memory effect, and furthermore reveal that the topological charge is preserved throughout the dramatic spin texture rearrangement and recovery. These results highlight a key aspect of topological protection-the preservation of the topological properties under continuous deformation-and also provide a promising avenue for information encryption and recovery.},
doi = {10.1103/physrevmaterials.6.084412},
journal = {Physical Review Materials},
number = 8,
volume = 6,
place = {United States},
year = {Tue Aug 30 00:00:00 EDT 2022},
month = {Tue Aug 30 00:00:00 EDT 2022}
}
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