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arXiv · 2311.06618

Single-Phase L1$_{0}$-Ordered High Entropy Thin Films with High Magnetic Anisotropy

Willie B. Beeson·Dinesh Bista·Huairuo Zhang·Sergiy Krylyuk·Albert V. Davydov·Gen Yin·Kai Liu
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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.

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Willie B. Beeson, Dinesh Bista, Huairuo Zhang, Sergiy Krylyuk, Albert V. Davydov, Gen Yin, Kai Liu. 2023-11-11. Single-Phase L1$_{0}$-Ordered High Entropy Thin Films with High Magnetic Anisotropy. https://doi.org/10.1002/advs.202308574

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