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Large Damping Enhancement in Dirac‐Semimetal–Ferromagnetic‐Metal Layered Structures Caused by Topological Surface States
Author(s) -
Ding Jinjun,
Liu Chuanpu,
Zhang Yuejie,
Kalappattil Vijaysankar,
Yu Rui,
Erugu Uppalaiah,
Tang Jinke,
Ding Haifeng,
Chen Hua,
Wu Mingzhong
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202008411
Subject(s) - materials science , spintronics , dirac (video compression format) , semimetal , condensed matter physics , ferromagnetism , surface states , topological insulator , thin film , surface (topology) , ferromagnetic resonance , metal , topology (electrical circuits) , nanotechnology , physics , optoelectronics , magnetic field , band gap , quantum mechanics , magnetization , metallurgy , geometry , mathematics , combinatorics , neutrino
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.