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A ferromagnet in a continuously tunable random field

Silevitch, D. M. and Bitko, D. and Brooke, J. and Ghosh, S. and Aeppli, G. and Rosenbaum, T. F. (2007) A ferromagnet in a continuously tunable random field. Nature, 448 (7153). pp. 567-570. ISSN 0028-0836. doi:10.1038/nature06050.

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Most physical and biological systems are disordered, even though the majority of theoretical models treat disorder as a weak perturbation. One particularly simple system is a ferromagnet approaching its Curie temperature, T_C, where all of the spins associated with partially filled atomic shells acquire parallel orientation. With the addition of disorder by way of chemical substitution, the Curie point is suppressed, but no qualitatively new phenomena appear in bulk measurements as long as the disorder is truly random on the atomic scale and not so large as to eliminate ferromagnetism entirely. Here we report the discovery that a simply measured magnetic response is singular above the Curie temperature of a model, disordered magnet, and that the associated singularity grows to an anomalous divergence at T_C. The origin of the singular response is the random internal field induced by an external magnetic field transverse to the favoured direction for magnetization. The fact that ferromagnets can be studied easily and with high precision using bulk susceptibility and a large variety of imaging tools will not only advance fundamental studies of the random field problem, but also suggests a mechanism for tuning the strength of domain wall pinning, the key to applications.

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Silevitch, D. M.0000-0002-6347-3513
Additional Information:© 2007 Nature Publishing Group. Received 12 March; accepted 19 June 2007. The work at the University of Chicago was supported by the US Department of Energy and the MRSEC programme of the US National Science Foundation, while work in London was supported by the UK Engineering and Physical Sciences Research Council and a Wolfson-Royal Society Research Merit Award.
Funding AgencyGrant Number
Department of Energy (DOE)UNSPECIFIED
Engineering and Physical Sciences Research Council (EPSRC)UNSPECIFIED
Wolfson Royal Society Research Merit AwardUNSPECIFIED
Issue or Number:7153
Record Number:CaltechAUTHORS:20140707-163026963
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:46941
Deposited By: George Porter
Deposited On:14 Jul 2014 15:41
Last Modified:10 Nov 2021 17:31

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