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Author Bewley, R. I. ♦ Cywinski, R.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ MAGNETS ♦ MAGNETIC SUSCEPTIBILITY ♦ DYSPROSIUM ALLOYS ♦ YTTRIUM ALLOYS ♦ NICKEL ALLOYS ♦ TERNARY ALLOY SYSTEMS ♦ AMORPHOUS STATE ♦ FREQUENCY DEPENDENCE ♦ HZ RANGE ♦ KHZ RANGE ♦ MAGNETIC ANISOTROPY
Abstract Frequency dependent complex ac susceptibility measurements have been made on amorphous Dy{sub {ital x}}Y{sub 7{minus}{ital x}}Ni{sub 3}, a model strong random magnetic anisotropy (RMA) system. Analysis of these measurements in terms of coexisting free and correlated or clustered Dy spins has enabled the evolution of the distribution of spin relaxation times to be mapped as a function of temperature from the paramagnetic phase into the low-temperature speromagnetic phase. Qualitatively the results are similar to those observed close to {ital T}{sub {ital g}} for spin-glass systems, but with a major difference: for the strong RMA {ital a}-Dy{sub {ital x}}Y{sub 7{minus}{ital x}}Ni{sub 3} system the spin relaxation times, as {ital T}{sub {ital g}} is approached from above, are of the order of seconds. This is some four orders of magnitude longer than those observed for typical spin glasses. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-12-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 21


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