Journal article
Fermi level dependent spin pumping from a magnetic insulator into a topological insulator
Physical review research, Vol.1(1), 012014
08/28/2019
DOI: 10.1103/PhysRevResearch.1.012014
Abstract
Topological spintronics aims to exploit the spin-momentum locking in the helical surface states of topological insulators for spin-orbit torque devices. We address a fundamental question that still remains unresolved in this context: Does the topological surface state alone produce the largest values of spin-charge conversion efficiency or can the strongly spin-orbit coupled bulk states also contribute significantly? By studying the Fermi level dependence of spin pumping in topological insulator/ferrimagnetic insulator bilayers, we show that the spin Hall conductivity is constant when the Fermi level is tuned across the bulk band gap, consistent with a full bulk band calculation. The results suggest a different perspective, wherein "bulk-surface correspondence" allows spin-charge conversion to be simultaneously viewed either as coming from the full bulk band, or from spin-momentum locking of the surface state.
Details
- Title: Subtitle
- Fermi level dependent spin pumping from a magnetic insulator into a topological insulator
- Creators
- Hailong Wang - Pennsylvania State UniversityJames Kally - Pennsylvania State UniversityCuneyt Sahin - University of IowaTao Liu - Colorado State UniversityWilson Yanez - Pennsylvania State UniversityEric J. Kamp - Pennsylvania State UniversityAnthony Richardella - Pennsylvania State UniversityMingzhong Wu - Colorado State UniversityMichael E. Flatte - University of IowaNitin Samarth - Pennsylvania State University
- Resource Type
- Journal article
- Publication Details
- Physical review research, Vol.1(1), 012014
- DOI
- 10.1103/PhysRevResearch.1.012014
- ISSN
- 2643-1564
- eISSN
- 2643-1564
- Publisher
- Amer Physical Soc
- Number of pages
- 6
- Grant note
- C-SPIN, center of STARnet, a Semiconductor Research Corporation (SRC) program - MARCO DE-SC0018994 / US Department of Energy; United States Department of Energy (DOE) N00014-15-1-2370 / ONR; Office of Naval Research SMART, one of seven centers of nCORE, an SRC program - National Institute of Standards and Technology (NIST) EFMA-1641989 / National Science Foundation; National Science Foundation (NSF) DMR-1420451 / Center for Emergent Materials, an NSF MRSEC; National Science Foundation (NSF) C-SPIN, center of STARnet, a Semiconductor Research Corporation (SRC) program - DARPA
- Language
- English
- Date published
- 08/28/2019
- Academic Unit
- Electrical and Computer Engineering; Physics and Astronomy
- Record Identifier
- 9984428678002771
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