Ferromagnetic vs. spin glass behavior in amorphous Fe-Ni based alloys
1981; American Institute of Physics; Volume: 52; Issue: 3 Linguagem: Inglês
10.1063/1.329698
ISSN1520-8850
AutoresS. M. Bhagat, J. A. Geohegan, Mark L. Spano, H. S. Chen,
Tópico(s)Material Dynamics and Properties
ResumoOur recent measurements on amorphous (FexNi1−x)75P16B6Al3 alloys yielded the magnetic phase diagram (T vs. x). For x<xc (xc≲0.17) paramagnet (PM) to spin glass (SG) transitions occur and for 0.4≳x≳xc, cooling produces a PM to ferromagnet transition followed, at lower T, by a FM-SG transition. We report low field ac susceptibility measurements on alloys for x in the neighborhood of xc. Application of a constant magnetic field (Ba) produces two peaks in χac(T) which mark the PM-FM and FM-SG transition temperatures. We obtain phase diagrams in the T vs. Ba plane, compare them to our numerical calculations based on recent theory, and infer the presence of large magnetic clusters for x≃xc.
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