Magnetic anisotropies in FeCo fine particles

Abstract The single-domain particles, especially FeCo fine particles have many applications in magnetic information technology. We have prepared Fe1−xCox 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−xCox 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 , surface and crystal anisotropies for x = 1 , shape, induced and crystal anisotropies for x = 0.3 and 0.5, and shape and induced anisotropies for x = 0.45 .