Schoen, Martin A. W. and Thonig, Danny and Schneider, Michael L. and Silva, T. J. and Nembach, Hans T. and Eriksson, Olle and Karis, Olof and Shaw, Justin M. (2016) Ultra-low magnetic damping of a metallic ferromagnet. NATURE PHYSICS, 12 (9). pp. 839-842. ISSN 1745-2473, 1745-2481
Full text not available from this repository. (Request a copy)Abstract
Magnetic damping is of critical importance for devices that seek to exploit the electronic spin degree of freedom, as damping strongly affects the energy required and speed at which a device can operate. However, theory has struggled to quantitatively predict the damping, even in common ferro-magnetic materials(1-3). This presents a challenge for a broad range of applications in spintronics(4) and spin-orbitronics that depend on materials and structures with ultra-low dampine(5,6). It is believed that achieving ultra-low damping in metallic ferromagnets is limited by the scattering of magnons by the conduction electrons. However, we report on a binary alloy of cobalt and iron that overcomes this obstacle and exhibits a damping parameter approaching 10(-4), which is comparable to values reported only for ferrimagnetic insulators(7,8). We explain this phenomenon by a unique feature of the band structure in this system: the density of states exhibits a sharp minimum at the Fermi level at the same alloy concentration at which the minimum in the magnetic damping is found. This discovery provides both a significant fundamental understanding of damping mechanisms and a test of the theoretical predictions proposed by Mankovsky and colleagues(3).
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COHERENT-POTENTIAL APPROXIMATION; DOMAIN-WALLS; THIN-FILMS; RESONANCE; RELAXATION; LINEWIDTH; |
| Subjects: | 500 Science > 530 Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 04 Apr 2019 13:09 |
| Last Modified: | 04 Apr 2019 13:09 |
| URI: | https://pred.uni-regensburg.de/id/eprint/3419 |
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