Single-Phase L1${}_0$-Ordered High Entropy Thin Films with High Magnetic Anisotropy

Abstract

The vast high entropy alloy (HEA) composition space is promising for discovery of new material phases with unique properties. We explore the potential to achieve rare-earth-free high magnetic anisotropy materials in single-phase HEA thin films. Thin films of FeCoNiMnCu sputtered on thermally oxidized Si/SiO${}_2$ substrates at room temperature are magnetically soft, with a coercivity on the order of 10 Oe. After post-deposition rapid thermal annealing (RTA), the films exhibit a single face-centered-cubic phase, with an almost 40-fold increase in coercivity. Inclusion of 50 at.% Pt in the film leads to ordering of a single L1${}_0$ high entropy intermetallic phase after RTA, along with high magnetic anisotropy and 3 orders of magnitude coercivity increase. These results demonstrate a promising HEA approach to achieve high magnetic anisotropy materials using RTA.

28 pages, including 4 figures and 6 pages of supporting information (5 SI figures and 2 SI tables)

References in corpus (5)

• Magnetization Reversal and Nanoscopic Magnetic Phase Separation in Doped La1-xSrxCoO3
• 3D Nanomagnetism in Low Density Interconnected Nanowire Networks
• Controlling magnetization reversal in Co/Pt nanostructures with perpendicular anisotropy
• Probing the A1 to L10 Transformation in FeCuPt Using the First Order Reversal Curve Method
• Single-Phase L1${}_0$-Ordered High Entropy Thin Films with High Magnetic Anisotropy

Cited by in corpus (2)

• Single-Phase L1${}_0$-Ordered High Entropy Thin Films with High Magnetic Anisotropy
• Fast \textit{ab initio} design of high-entropy magnetic thin films