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Large Damping Enhancement in Dirac‐Semimetal–Ferromagnetic‐Metal Layered Structures Caused by Topological Surface States

Journal Article · · Advanced Functional Materials
 [1];  [1];  [2];  [1];  [3];  [4];  [4];  [5];  [6];  [1]
  1. Department of Physics Colorado State University Fort Collins CO 80523 USA
  2. Department of Physics Colorado State University Fort Collins CO 80523 USA, School of Optical and Electronic Information Huazhong University of Science and Technology Wuhan Hubei 430074 China
  3. Department of Physics Colorado State University Fort Collins CO 80523 USA, National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing Jiangsu 210093 China
  4. Department of Physics and Astronomy University of Wyoming Laramie Wyoming 82071 USA
  5. National Laboratory of Solid State Microstructures and Department of Physics Nanjing University Nanjing Jiangsu 210093 China
  6. Department of Physics Colorado State University Fort Collins CO 80523 USA, School of Advanced Materials Discovery Colorado State University Fort Collins CO 80523 USA
Abstract

This article reports damping enhancement in a ferromagnetic NiFe thin film due to an adjacent α‐Sn thin film. Ferromagnetic resonance studies show that an α‐Sn film separated from a NiFe film by an ultrathin Ag spacer can cause an extra damping in the NiFe film that is three times bigger than the intrinsic damping of the NiFe film. Such an extra damping is absent in structures where the α‐Sn film interfaces directly with a NiFe film, or is replaced by a β‐Sn film. The data suggest that the extra damping is associated with topologically nontrivial surface states in the topological Dirac semimetal phase of the α‐Sn film. This work suggests that, like topological insulators, topological Dirac semimetal α‐Sn may have promising applications in spintronics.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0018994
OSTI ID:
1804171
Alternate ID(s):
OSTI ID: 1852742
Journal Information:
Advanced Functional Materials, Journal Name: Advanced Functional Materials Journal Issue: 11 Vol. 31; ISSN 1616-301X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
Germany
Language:
English

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