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Phys. Rev. Lett. 91, 217201 (2003) [4 pages]

Incommensurate Spin Density Waves in Iron Aluminides

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D. R. Noakes1, A. S. Arrott1,2, M. G. Belk1, S. C. Deevi3, Q. Z. Huang4, J. W. Lynn4, R. D. Shull2, and D. Wu5
1Center for Interactive Micromagnetics, Virginia State University, Petersburg, Virginia 23806, USA
2MSEL, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
3Research, Development and Engineering Center, Philip Morris USA, Richmond, Virginia 23261, USA
4NCNR, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
5Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire 03755, USA

Received 5 August 2003; published 18 November 2003

Neutron diffraction in Fe(Al) reveals incommensurate spin density waves (SDWs) in alloys known to be spin glasses. The wave vectors for crystals of Fe(34Al), Fe(40Al), and Fe(43Al) show n varying from 11 to 6 for q⃗=2π(h±1/n,k±1/n,l±1/n)/a0, where (h,k,l) and a0 characterize the parent bcc lattice of the CsCl structure. The magnetic reflections are present far above the spin-glass freezing temperatures. These SDWs keep the spins on nearest-neighbor Fe atoms close to parallel, in contrast with SDWs in Cr, which keep nearest-neighbor spins close to antiparallel.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.217201
DOI:
10.1103/PhysRevLett.91.217201
PACS:
75.25.+z, 75.30.Fv, 75.50.Bb
 
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