Temperature dependent magnetic properties of highly chemically ordered Fe55−xNixPt45L1 films

Magnetic media using materials with high uniaxial magneto-crystalline anisotropy, $K_U,$ combined with a thermal assist to overcome write field limitations have been proposed as one of the potential technologies to extend the areal density of magnetic disk recording beyond the limitations of current technology. Here we present an investigation on structural and temperature dependent magnetic properties of chemically ordered epitaxial ${\mathrm{Fe}}_{\text{55−x}}{\mathrm{Ni}}_x{\mathrm{Pt}}_{45}$ thin films. Increasing Ni additions result in a steady reduction of magneto-crystalline anisotropy, saturation magnetization, and Curie temperature. The ability to control thermomagnetic properties over a wide range makes ${\mathrm{Fe}}_{\text{55−x}}{\mathrm{Ni}}_x{\mathrm{Pt}}_{45}$ and similar FePt-based pseudo-binary alloys attractive base materials for media applications in thermally assisted magnetic recording.