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Ultra-low magnetic damping of a metallic ferromagnet
NIST, Quantum Electromagnet Div, Boulder, CO 80305 USA.;Univ Regensburg, Inst Expt & Appl Phys, D-93053 Regensburg, Germany..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
NIST, Quantum Electromagnet Div, Boulder, CO 80305 USA..
NIST, Quantum Electromagnet Div, Boulder, CO 80305 USA..
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2016 (English)In: Nature Physics, ISSN 1745-2473, E-ISSN 1745-2481, Vol. 12, no 9, p. 839-842Article in journal (Refereed) Published
Abstract [en]

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).

Place, publisher, year, edition, pages
2016. Vol. 12, no 9, p. 839-842
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-305557DOI: 10.1038/nphys3770ISI: 000383219800009OAI: oai:DiVA.org:uu-305557DiVA: diva2:1038837
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation, 2013.0020, 2012.0031
Available from: 2016-10-20 Created: 2016-10-19 Last updated: 2017-11-29Bibliographically approved

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