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Magnetic anisotropies in FeCo fine particles

Authors:	S Zoriasatain F Azarkharman SA Sebt M Akhavan

Institution:	^aPhysics Research Center, Science and Research Campus, Islamic Azad University, Tehran, Iran ^bPhysics Department, Tehran-North Branch, Islamic Azad University, Tehran, Iran ^cPhysics Department, Tarbiat Modarres University, P.O. Box 14155-4838, Tehran, Iran ^dMagnet Research Laboratory (MRL), Department of Physics, Sharif University of Technology, P.O. Box 11365-9161, Tehran, Iran

Abstract:	The single-domain particles, especially FeCo fine particles have many applications in magnetic information technology. We have prepared Fe₁₋_xCo_x fine particles for different x by borohydride method and measured the magnetic and structural properties of the samples. We have then determined the variations of coercivity and anisotropy energy versus x in Fe₁₋_xCo_x fine particles. The obtained results have been analyzed on the basis of various magnetic anisotropies. Magnetic anisotropies affect the coercivity of the medium for each x as follows: shape and crystal anisotropies for x=0 $x = 0$ , surface and crystal anisotropies for x=1 $x = 1$ , shape, induced and crystal anisotropies for x=0.3 $x = 0.3$ and 0.5, and shape and induced anisotropies for x=0.45 $x = 0.45$ .

Keywords:	Magnetic anisotropy Coercivity Single-domain particles Magnetic recording media
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