A ferromagnet in a continuously tunable random field

D. M. Silevitch, D. Bitko, J. Brooke, S. Ghosh, G. Aeppli and T. F. Rosenbaum ()
Additional contact information
D. M. Silevitch: The University of Chicago, Chicago, Illinois 60637, USA
D. Bitko: MPI Research Inc., East Brunswick, New Jersey 08816, USA
J. Brooke: Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts 02420, USA
S. Ghosh: School of Natural Sciences, University of California Merced, Merced, California 95344, USA
G. Aeppli: UCL, London WC1E 6BT, UK
T. F. Rosenbaum: The University of Chicago, Chicago, Illinois 60637, USA

Nature, 2007, vol. 448, issue 7153, 567-570

Abstract: Order and disorder Theoretical models of real biological and physical systems can take some disorder into account, but it is usually treated only as a weak perturbation. But in systems such as ferromagnets, the disorder can dominate a material's performance. One model that successfully incorporates effects of disorder in magnetism, the 'random field Ising model', has so far been applied only to antiferromagnets. Silevitch et al. have now realized a random field model in a ferromagnet. Using this model it is possible to measure a singular behaviour of the magnetic response just above the Curie temperature (where all magnetic pointers line up) and its divergence at the Curie temperature. Many bulk probe and imaging measurements are possible in ferromagnets, so this work should advance studies of the random field problem and also lead to ways of tuning the strength of domain wall pinning, a key step towards practical applications of the phenomenon.

Date: 2007
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DOI: 10.1038/nature06050

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