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Khodadadi B, Rai A, Sapkota A, Srivastava A, Nepal B, Lim Y, Smith DA, Mewes C, Budhathoki S, Hauser AJ, Gao M, Li JF, Viehland DD, Jiang Z, Heremans JJ, Balachandran PV, Mewes T, Emori S. Conductivitylike Gilbert Damping due to Intraband Scattering in Epitaxial Iron. PHYSICAL REVIEW LETTERS 2020; 124:157201. [PMID: 32357022 DOI: 10.1103/physrevlett.124.157201] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 12/02/2019] [Accepted: 03/18/2020] [Indexed: 06/11/2023]
Abstract
Confirming the origin of Gilbert damping by experiment has remained a challenge for many decades, even for simple ferromagnetic metals. Here, we experimentally identify Gilbert damping that increases with decreasing electronic scattering in epitaxial thin films of pure Fe. This observation of conductivitylike damping, which cannot be accounted for by classical eddy-current loss, is in excellent quantitative agreement with theoretical predictions of Gilbert damping due to intraband scattering. Our results resolve the long-standing question about a fundamental damping mechanism and offer hints for engineering low-loss magnetic metals for cryogenic spintronics and quantum devices.
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Affiliation(s)
- Behrouz Khodadadi
- Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Anish Rai
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
- Center for Materials for Information Technology (MINT), University of Alabama, Tuscaloosa, Alabama 35487, USA
| | - Arjun Sapkota
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
- Center for Materials for Information Technology (MINT), University of Alabama, Tuscaloosa, Alabama 35487, USA
| | - Abhishek Srivastava
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
- Center for Materials for Information Technology (MINT), University of Alabama, Tuscaloosa, Alabama 35487, USA
| | - Bhuwan Nepal
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
- Center for Materials for Information Technology (MINT), University of Alabama, Tuscaloosa, Alabama 35487, USA
| | - Youngmin Lim
- Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - David A Smith
- Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Claudia Mewes
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
- Center for Materials for Information Technology (MINT), University of Alabama, Tuscaloosa, Alabama 35487, USA
| | - Sujan Budhathoki
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
- Center for Materials for Information Technology (MINT), University of Alabama, Tuscaloosa, Alabama 35487, USA
| | - Adam J Hauser
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
- Center for Materials for Information Technology (MINT), University of Alabama, Tuscaloosa, Alabama 35487, USA
| | - Min Gao
- Department of Material Science and Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Jie-Fang Li
- Department of Material Science and Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Dwight D Viehland
- Department of Material Science and Engineering, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Zijian Jiang
- Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Jean J Heremans
- Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
| | - Prasanna V Balachandran
- Department of Material Science and Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
- Department of Mechanical and Aerospace Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
| | - Tim Mewes
- Department of Physics and Astronomy, University of Alabama, Tuscaloosa, Alabama 35487, USA
- Center for Materials for Information Technology (MINT), University of Alabama, Tuscaloosa, Alabama 35487, USA
| | - Satoru Emori
- Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
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