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Updated: Jun 22, 2025
09:41
Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
Published on: May 29, 2018
9.5K
Single-Phase L10-Ordered High Entropy Thin Films with High Magnetic Anisotropy.
Willie B Beeson1, Dinesh Bista1, Huairuo Zhang2,3
1Physics Department, Georgetown University, Washington, DC, 20057, USA.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|June 29, 2024
Summary
High entropy alloys (HEAs) offer a path to rare-earth-free magnetic materials. Rapid thermal annealing of FeCoNiMnCuPt HEA films induced a single L10 phase, significantly boosting magnetic anisotropy.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Magnetism
Background:
- High entropy alloys (HEAs) possess vast composition spaces for discovering novel material phases with unique properties.
- The development of rare-earth-free magnetic materials with high magnetic anisotropy is crucial for advanced technological applications.
- Controlling phase formation and magnetic properties in thin film alloys requires precise processing techniques.
Purpose of the Study:
- To explore the potential of single-phase high entropy alloy thin films for achieving rare-earth-free high magnetic anisotropy.
- To investigate the effect of rapid thermal annealing (RTA) on the phase structure and magnetic properties of FeCoNiMnCu-based HEAs.
- To determine if incorporating platinum (Pt) can induce specific ordered phases and enhance magnetic anisotropy.
Main Methods:
- Fabrication of FeCoNiMnCu and FeCoNiMnCuPt thin films using sputtering on Si/SiO2 substrates at room temperature.
- Post-deposition rapid thermal annealing (RTA) to induce phase transformations.
- Characterization of film phases using X-ray diffraction and measurement of magnetic properties, including coercivity.
Main Results:
- As-deposited FeCoNiMnCu films were magnetically soft (coercivity ~10 Oe).
- RTA treatment resulted in a single face-centered-cubic phase for FeCoNiMnCu films, increasing coercivity by approximately 40-fold.
- Inclusion of 50 at.% Pt and subsequent RTA led to the ordering of a single L10 high entropy intermetallic phase, yielding high magnetic anisotropy and a three-orders-of-magnitude increase in coercivity.
Conclusions:
- Rapid thermal annealing is an effective method for controlling phase formation and enhancing magnetic properties in high entropy alloys.
- The FeCoNiMnCuPt system demonstrates a promising rare-earth-free approach to achieving high magnetic anisotropy materials.
- The formation of the L10 phase in HEAs is a viable strategy for developing advanced magnetic applications.
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