Tuning magnetic anisotropy in (001) oriented L10 (Fe1-xCux)55Pt45 films

TL;DR

This study demonstrates the controlled tuning of magnetic anisotropy in oriented L10 (Fe1-xCux)55Pt45 films through Cu addition, using atomic-scale multilayer sputtering and annealing, with potential applications in magnetic recording.

Contribution

It introduces a method to systematically tune magnetic properties of L10 Fe-Cu-Pt films by Cu content variation under convenient synthesis conditions.

Findings

Magnetic anisotropy up to 3.6x10^7 erg/cm^3 achieved

Cu addition increases tetragonal distortion and alters microstructure

Saturation magnetization decreases with more Cu

Abstract

We have achieved (001) oriented L10 (Fe1-xCux)55Pt45 thin films, with magnetic anisotropy up to 3.6x10^7 erg/cm^3, using atomic-scale multilayer sputtering and post annealing at 400 {\deg}C for 10 seconds. By fixing the Pt concentration, structure and magnetic properties are systematically tuned by the Cu addition. Increasing Cu content results in an increase in the tetragonal distortion of the L10 phase, significant changes to the film microstructure, and lowering of the saturation magnetization and anisotropy. The relatively convenient synthesis conditions, along with the tunable magnetic properties, make such materials highly desirable for future magnetic recording technologies.