Spin-glass and double-transition behavior in Gd-La glasses

M. J. O'Shea, D. J. Sellmyer

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5 Scopus citations

Abstract

We report studies of high-field magnetization, field-cooled magnetization, thermoremanent magnetization, and isothermal remanent magnetization as a function of temperature in the metallic glass sytem GdxLa 72-xG28 where G28=Ga 18B10 for the compositions x=72, 68, 64. The first two compositions show double-transition behavior and the last one shows only a paramagnetic to spin-glass transition. The approach to saturation at intermediate fields (up to 40 kOe) is of the form 1/H1 /2 as predicted by a mean field model which incorporates a small random anisotropy. The field-cooled magnetization in these samples is independent of time and is reversible, suggesting it is the equilibrium magnetization. This field-cooled magnetization in the double transition samples (and spin-glass sample) goes smoothly to zero with applied field, indicating the absence of an equilibrium macroscopic moment in zero applied field. The thermoremanence shows a maximum which becomes progressively more pronounced as x decreases.

Original languageEnglish (US)
Pages (from-to)3470-3472
Number of pages3
JournalJournal of Applied Physics
Volume57
Issue number8
DOIs
StatePublished - 1985

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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