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Evolution of ferromagnetic interactions from cluster spin glass state in Co–Ga alloy
Sk Mohammad Yasin, ,
Published in Elsevier B.V.
2016
Volume: 418
   
Pages: 158 - 162
Abstract
Low temperature magnetic properties of binary CoxGa100−x (x=54–57) alloy have been investigated. Analysis of frequency dependence of ac susceptibility provided a conclusive evidence for the existence of cluster spin glass like behavior with the freezing temperature ~8, 14 K for x=54, 55.5 respectively. The parameters for conventional ‘slowing down’ of the spin dynamics have been extracted from the acs data, which confirm the presence of glassy phase. The magnitude of Mydosh parameter obtained from the fits is larger than that reported for typical canonical spin glasses and smaller than those for non-interacting ideal superparamagnetic systems but comparable to those of known cluster-glass systems. Memory phenomena using specific cooling protocols also support the spin-glass features in Co55.5Ga44.5 composition. Further the development of ferromagnetic clusters from the cluster spin glass state has been observed in x=57 composition. © 2016 Elsevier B.V.
About the journal
JournalData powered by TypesetJournal of Magnetism and Magnetic Materials
PublisherData powered by TypesetElsevier B.V.
ISSN03048853
Open AccessNo
Concepts (21)
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    Cobalt
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    Cobalt compounds
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    Ferromagnetic materials
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    Ferromagnetism
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    Gallium alloys
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    Glass
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    Lanthanum compounds
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    Magnetic susceptibility
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    Magnetization
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    Spin dynamics
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    Superparamagnetism
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    Temperature
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    A.C. SUSCEPTIBILITY
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    Cluster glass
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    CLUSTER-SPIN GLASS STATE
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    Ferro-magnetic interactions
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    Ferromagnetic clusters
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    Freezing temperatures
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    Frequency dependence
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    SUPERPARAMAGNET
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    Spin glass