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Experimental study of the spin density of metastable fcc ferromagnetic Fe-Cu alloys

2000; American Physical Society; Volume: 61; Issue: 14 Linguagem: Inglês

10.1103/physrevb.61.9457

1095-3795

L. E. Bove, C. Petrillo, F. Sacchetti, G. Mazzone,

Magnetic properties of thin films

Magnetization density measurements on metastable ${\mathrm{Fe}}_{x}{\mathrm{Cu}}_{1\ensuremath{-}x}$ alloys at four compositions $(x=20,$ 40, 50, and 60 at. %) and at 5 K temperature were carried out by means of polarized neutron diffraction. The samples were produced by high-energy ball milling and characterized by x-ray diffraction and fluorescence measurements. Additional bulk magnetization measurements were carried out on the two samples at high Fe concentration. Over the present concentration region, the Fe-Cu system is ferromagnetic and the four samples were found to be in the fcc phase. Fe-Cu is therefore a very suitable system to investigate the magnetic state of Fe in an fcc environment. Other than confirming that the Fe-Cu system is not a simple dilution alloy, the present results were compatible with a two-state model for fcc Fe---that is, two different coexisting electronic states associated with different magnetic moments and form factors.