Patent attributes
A method to produce dispersion of magnetic metal particle aggregates is provided. FePt nanoparticles are uniformly dispersed with the particles separated at controlled inter-particle spacing. The magnetic metal particle aggregate is composed of magnetic metal particles whose main components and the contents thereof are represented by the following general formula (1):[TXM1−X]YZ1−Y, (1)whereT is one or both of Fe and Co,M is one or both of Pt and Pd,Z is at least one member selected from the group composed of Ag, Cu, Bi, Sb, Pb and Sn,X represents 0.3˜0.7, andY represents 0.7˜1.0,the balance being impurities unavoidably incorporated during production,whereinthe proportion of face-centered tetragonal structure is in the range of 10˜100%,the particles have an average diameter of 30 nm or less, andthe particles are in a dispersed state spaced apart from one another.
