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Giant Moment, Superparamagnetic, Spin‐Glass, and Quasiferromagnetic Properties of Dilute PtFe Alloys
Author(s) -
Kiymaç K.
Publication year - 1985
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221280221
Subject(s) - superparamagnetism , condensed matter physics , spin glass , saturation (graph theory) , materials science , magnetometer , squid , magnetic susceptibility , curie temperature , magnetic moment , atmospheric temperature range , magnetic field , ferromagnetism , analytical chemistry (journal) , nuclear magnetic resonance , magnetization , chemistry , thermodynamics , physics , ecology , mathematics , chromatography , quantum mechanics , combinatorics , biology
Using an RF‐SQUID magnetometer, the temperature‐dependent magnetic susceptibility of dilute Pt‐Fe alloys containing 10.5 ppm Fe, and 0.87 and 0.99 at% Fe is measured in the temperature range 1 to 4.2 K and in de‐fields between 0.5 and 15 Oe. For 10.5 ppm Fe, the susceptibility obeys the Curie law, and the saturation magnetic moment μ sat is ≈ 9.3μ B /Fe. The Pt‐0.87 at% Fe and −0.99 at% Fe alloys are spin‐glass and quasiferromagnetic, respectively, and both show superparamagnetic properties at temperatures between transition temperature T t and ≈ 2 T t . Furthermore, the susceptibility of these alloys, around and below T t , is field dependent, decreasing in magnitude with increasing field.
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