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Electrical noise in the spin-glass gold-iron

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Title: Electrical noise in the spin-glass gold-iron
Alternative Title: Electrical noise in the spin-glass AuFe
Author(s): Meyer, Karl Alan
Doctoral Committee Chair(s): Weissman, Michael B.
Department / Program: Physics
Discipline: Physics
Degree Granting Institution: University of Illinois at Urbana-Champaign
Degree: Ph.D.
Genre: Dissertation
Subject(s): Physics, Condensed Matter
Abstract: Measurements of electrical resistance fluctuations have been performed on the spin-glass AuFe in order to compare with prior results in CuMn. Macroscopic AuFe samples showed a sharp increase in the noise with the onset of the noise at a temperature corresponding to the peak in the magnetic susceptibility as a function of temperature. This temperature is identified as the transition into the spin-glass phase. Measurements on mesoscopic AuFe samples showed significantly different behavior than mesoscopic CuMn samples, due to the large anisotropy introduced by the gold. AuFe samples showed persistent two-state behavior which indicates a smaller number of states being available to the system than in CuMn which never had stable first spectra. Some of these stable spectral features could be tracked through a temperature range of several degrees enabling the calculation of activation energies and attempt rates. Thermal cycles above the spin-glass temperature caused much less variability in the resistance fluctuation spectrum and the resistance than in CuMn. Second spectrum measurements failed to fit AuFe clearly into either a hierarchical or interacting droplet picture, although this part of the data was more closely identifiable with the hierarchical predictions.
Issue Date: 1994
Type: Text
Language: English
URI: http://hdl.handle.net/2142/21867
Rights Information: Copyright 1994 Meyer, Karl Alan
Date Available in IDEALS: 2011-05-07
Identifier in Online Catalog: AAI9512486
OCLC Identifier: (UMI)AAI9512486
 

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