Abstract
Nanostructured Fe1−x Ni x and Fe1−x−y Ni x Cr y (x = 30, 40; y = 10) powders were obtained by mechanical alloying technique (MA) from elemental powders using a planetary ball mill. The evolution of structure, microstructure and magnetic properties of mechanically alloyed powders were studied by X-ray diffraction, scanning electron microscopy and a vibrating sample magnetometer. The MA powders for 7 h consist of two solid solutions bcc and fcc. The saturation magnetization was found to decrease with increasing Ni content and so with increasing fcc solid solution amount. Oxidation of MA powders results in the formation of tree phases: antiferromagnetic NiO, hematite α-Fe2O3, and ferrimagnetic spinel structure NiFe2O4. According to the magnetic measurements, the oxidation leads to the deterioration of magnetic behavior due to the exchange bias anisotropy.
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