Experimental determination of Lévy flight distributions of the energy barriers in spin glasses

Nicole Gorham, Rob Woodward, Tim St Pierre, Robert Stamps, M.J.C. Walker, D. Greig, J.A.D. Matthew

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Abstract

Zero-field magnetic viscosity measurements at low temperatures were made on a series of Pd40Ni40−xFexP20 (x=10–20) samples in order to determine the apparent magnetic-moment-weighted energy barrier distributions for these spin-glass alloys. The distributions observed are best described by a stretched exponential in the form of a truncated Lévy flight distribution. This form suggests a hierarchical landscape of apparent energy barriers arising from interactions between randomly oriented magnetic clusters within the material. The degree of stretching of the exponential form of the energy barrier distributions is found to increase with decreasing iron concentration. © 2004 American Institute of Physics.
Original languageEnglish
Pages (from-to)6983-6985
JournalJournal of Applied Physics
Volume95
Issue number11
DOIs
Publication statusPublished - 2004

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Gorham, N., Woodward, R., St Pierre, T., Stamps, R., Walker, M. J. C., Greig, D., & Matthew, J. A. D. (2004). Experimental determination of Lévy flight distributions of the energy barriers in spin glasses. Journal of Applied Physics, 95(11), 6983-6985. https://doi.org/10.1063/1.1689771