Title: Rare-Earth Permanent Magnet SmCo5 for Chiral Interfacial Spin-Orbitronics

Journal Article · · Advanced Functional Materials
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  1. Tsinghua Univ., Beijing (China)
  2. Tsinghua Univ., Beijing (China); National University of Defense Technology, Changsha (China)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Chonnam National University, Gwangju (Korea)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
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Interfacially asymmetric magnetic multilayers made of heavy metal/ferromagnet have attracted considerable attention in the spintronics community for accommodating spin-orbit torques (SOTs) and meanwhile for hosting chiral spin textures. In these multilayers, the accompanied interfacial Dzyaloshinskii–Moriya interaction (iDMI) permits the formation of Néel-type spin textures. While significant progresses have been made in Co, CoFeB, Co2FeAl, CoFeGd based multilayers, it would be intriguing to identify new magnetic multilayers that could enable spin-torque controllability and meanwhile host nanoscale skyrmions. In this report, first, thin films made of permanent magnet SmCo5 with perpendicular magnetic anisotropy are synthesized, in which the deterministic SOT switching, enabled by the spin Hall effect, in Pt/SmCo5/Ta trilayer is demonstrated. Further, the stabilization of room-temperature skyrmions with diameters ≈100 nm in [Pt/SmCo5/Ta]15, together with a skyrmionium-like spin texture in [Pt/SmCo5/Ir]15 multilayers is shown. Based on the material specific parameters, micromagnetic simulations are also carried out. The results confirm the presence of chiral spin textures in this new material family. Through interfacial engineering, the results thus demonstrate that rare earth permanent magnets could be a new platform for studying interfacial chiral spintronics.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
Beijing Advanced Innovation Center for Future Chip (ICFC); Beijing Natural Science Foundation; Korea government (MSIT); National Key R&D Program of China; National Natural Science Foundation of China (NSFC); USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1827913
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 46 Vol. 31; ISSN 1616-301X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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36 MATERIALS SCIENCE
perpendicular magnetic anisotropy
rare-earth permanent magnets
skyrmions
spin-orbit torque