Study of the onset of a long-range ferromagnetic order in an ensemble of small particles with giant magnetic moments

We have studied the unmixing alloy Cu 64Mn 9Al 27 by X-rays and magnetic methods as well as small-angle neutron scattering. In the quenched state the alloy behaves as a typical spin glass. When the sample is further annealed, the formation of small particles with the stoichiometric composition Cu 2M...

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Veröffentlicht in:Journal of magnetism and magnetic materials 1999-08, Vol.202 (2), p.376-384
Hauptverfasser: Takzei, G.A, Mirebeau, I, Gun'ko, L.P, Sych, I.I, Surzhenko, O.B, Cherepov, S.V, Troschenkov, Yu.N
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Sprache:eng
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Zusammenfassung:We have studied the unmixing alloy Cu 64Mn 9Al 27 by X-rays and magnetic methods as well as small-angle neutron scattering. In the quenched state the alloy behaves as a typical spin glass. When the sample is further annealed, the formation of small particles with the stoichiometric composition Cu 2MnAl occurs. At high temperatures the alloy is a typical superparamagnet. After cooling the alloy undergoes the re-entrant phase transition `paramagnetic–ferromagnetic-spin glass'. It was shown on the example of the investigated alloy in decomposed state that the appearance of long-range ferromagnetic order in a system of superparamagnetic particles dissolved in nonmagnetic metallic matrix is due to the cooperative ordering of their magnetic moments.
ISSN:0304-8853
DOI:10.1016/S0304-8853(99)00357-1