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Title: Antiferromagnetic correlations in Fe-Cu granular alloys: the role of the surface structure
Author: Batlle Gelabert, Xavier
Echer, Chuck J.
Nelson, E. Chris
Krishnan, K. M.
Hattink, Bart Jan
Keywords: Aliatges
Superfícies (Física)
Propietats magnètiques
Surfaces (Physics)
Magnetic properties
Issue Date: 2000
Publisher: American Institute of Physics
Abstract: Fe precipitates in a Cufcc matrix, prepared using the Bridgeman method and with an average composition of Cu97Fe3, displayed the coexistence of ferromagnetism ~FM!, spin glass-like ~SGL! behavior and antiferromagnetic ~AFM! correlations. The two former contributions may be attributed, respectively, to the segregation of FM, a-Febcc precipitates and to the few Fe spins distributed in the matrix. The annealing procedures increased the FM contribution and, as particle growth and phase segregation took place, the SGL behavior progressively disappeared. Results from high resolution transmission electron microscopy ~HRTEM!, x-ray photoelectron spectroscopy ~XPS!, and electron energy-loss spectroscopy ~EELS! suggest that the AFM correlations are due to the a-Fe particles that show a surface layer of a few nanometers in thickness, of either FeO and/or g-Fefcc . XPS and EELS measurements confirm the presence of FeO; however, the latter is only tentatively suggested by the HRTEM analysis of the particle/matrix interfaces.
Note: Reproducció del document publicat a:
It is part of: Journal of Applied Physics, 2000, vol. 87, núm. 6, p. 3037-3043
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ISSN: 0021-8979
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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