Dynamic susceptibility of a strong random anisotropy magnet

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.54.15251· OSTI ID:397611

Bewley, R I; Cywinski, R ^[1]

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1. School of Physics and Astronomy, University of St Andrews, St Andrews, KY169SS (Scotland)

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.}

• OSTI ID: 397611
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 21 Vol. 54; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AMORPHOUS STATE
DYSPROSIUM ALLOYS
FREQUENCY DEPENDENCE
HZ RANGE
KHZ RANGE
MAGNETIC ANISOTROPY
MAGNETIC SUSCEPTIBILITY
MAGNETS
NICKEL ALLOYS
TERNARY ALLOY SYSTEMS
YTTRIUM ALLOYS