Magnetic recording medium with manganese-gallium alloy recording layer

摘要

A magnetic recording medium comprising a manganese-gallium alloy recording layer. The manganese-gallium alloy has uniaxial anisotropy and may have a tetragonal structure. The recording layer has an easy magnetic axis normal to the recording medium substrate for perpendicular recording and may comprise Mn2±xGa where 0 ¤ x ¤ 1. The recording layer may be tetragonal epitaxial Mn2Ga having an anisotropy constant Ku of 2.35 MJm-3, a magnetization of 470 kAm-1 and an anisotropy field µ0Ha of 10T. The recording medium may have a substrate selected from one of MgO (001), Cr (001), Ag(001), Au (001), Al (001) and may include a seed layer. The recording layer may be formed by sputtering. Fig. 3(a) shows magnetization curves for Mn2Ga with magnetic field applied perpendicular and parallel to the recording film.