Journal
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
Volume 320, Issue 21, Pages 2780-2783Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jmmm.2008.06.014
Keywords
nanocrystalline magnetic material; mechanical alloying; crystallite size; dislocation density; coercivity
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Nanocrystalline Fe75Si25 powders were prepared by mechanical alloying in a planetary ball mill. The evolution of the microstructure and magnetic properties during the milling process were studied by X-ray diffraction, scanning electron microscope and vibrating sample magnetometer measurements. The evolution of non-equilibrium solid solution Fe (Si) during milling was accompanied by refinement of crystallite size down to 10 nm and the introduction of high density of dislocations of the order of 10(17) m(-2). During the milling process, Fe sites get substituted by Si. This structural change and the resulting disorder are reflected in the lattice parameters and average magnetic moment of the powders milled for various time periods. A progressive increase of coercivity was also observed with increasing milling time. The increase of coercivity could be attributed to the introduction of dislocations and reduction of powder particle size as a function of milling time. (C) 2008 Elsevier B.V. All rights reserved.
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