Abstract
Iron–platinum and cobalt–platinum thin film magnets with thicknesses of 120nm and 135nm, respectively are irradiated with 180keV 20Ne or 2MeV 4He ions, and in-plane coercivities of the magnets are measured as a function of fluences of the ions. Densities of displaced Fe, Co and Pt atoms are calculated with a TRIM code. It is found that the coercivities are determined by the densities of displaced atoms rather than the kind of ions and incident energies. Resistance of the Co–Pt thin film magnets to irradiation of 2MeV 4He ions is almost the same as that of the Fe–Pt magnets.
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