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Dipole interactions with random anisotropy in a frozen ferrofluid

Luo, Weili and Nagel, S. R. and Rosenbaum, T. F. and Rosensweig, R. E. (1991) Dipole interactions with random anisotropy in a frozen ferrofluid. Physical Review Letters, 67 (19). pp. 2721-2724. ISSN 0031-9007. doi:10.1103/PhysRevLett.67.2721.

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Glassy behavior (including hysteresis, irreversibility, a peak in the zero-field-cooled magnetization, and nonexponential relaxation) is observed in a quenched ferrofluid system consisting of 50-angstrom magnetite particles. An Arrott plot, M^2 vs H/M, shows clear features of random anisotropy similar to what is found in amorphous ferromagnets. We discuss the glassy behavior in terms of both the random anisotropy and the dipole interactions, and we contrast the unusual response of our system with canonical spin glasses.

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Additional Information:© 1991 The American Physical Society. Received 21 June 1991. We thank J. Popplewell and S. W. Charles for providing the samples used in this work. We are grateful to T. Witten, K. Levin, J. Marko, and J. Rudnick for stimulating discussions. The work at the University of Chicago was supported by NSF-MRL Grant No. DMR88-19860.
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NSFDMR 88-19860
Issue or Number:19
Classification Code:PACS numbers: 75.50.Lk, 75.50.Mm
Record Number:CaltechAUTHORS:20140707-163038388
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47020
Deposited By: George Porter
Deposited On:10 Jul 2014 02:57
Last Modified:10 Nov 2021 17:33

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