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APS » Journals » Phys. Rev. Lett. » Volume 98 » Issue 11
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Phys. Rev. Lett. 98, 117601 (2007) [4 pages]

Low Relaxation Rate in Epitaxial Vanadium-Doped Ultrathin Iron Films

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C. Scheck1, L. Cheng1, I. Barsukov2, Z. Frait2, and W. E. Bailey1,*
1Materials Science, Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA
2Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic

Received 29 December 2006; published 12 March 2007

The longest relaxation time and sharpest frequency content in ferromagnetic precession is determined by the intrinsic (Gilbert) relaxation rate G. For many years, pure iron (Fe) has had the lowest known value of G=57  MHz for all pure ferromagnetic metals or binary alloys. We show that an epitaxial iron alloy with vanadium (V) possesses values of G which are significantly reduced to 35±5  MHz at 27% V. The result can be understood as the role of spin-orbit coupling in generating relaxation, reduced through the atomic number Z.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.98.117601
DOI:
10.1103/PhysRevLett.98.117601
PACS:
76.30.Fc, 72.25.Rb, 75.40.Gb, 75.50.Bb

*Electronic address: web54@columbia.edu

 
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