Magnetic Properties of High-Entropy Alloys

High-entropy alloys (HEAs) represent a transformative class of metallic materials characterised by the near-equiatomic mixing of five or more elements. This complex compositional landscape gives rise to unique magnetic behaviours that can be tuned across a spectrum from soft ferromagnetism to high coercivity depending on elemental selection, phase constitution and microstructural control. Key magnetic properties include saturation magnetisation, coercivity and magnetic anisotropy, each of which is influenced by atomic interactions, short-range ordering and precipitate formation. High-temperature stability and mechanical robustness are increasingly vital as applications extend to electric motors, energy conversion devices and magnetocaloric refrigeration. Recent work has emphasised strategies to reconcile magnetic performance with strength and ductility, often through controlled precipitation or ordering transitions that preserve low hysteresis losses while withstanding thermal and mechanical stress. Investigations into magnetocaloric effects, phase-decomposition-driven magnetisation changes and thin-film ordering have expanded the functional scope of HEAs, highlighting both fundamental insights into exchange interactions and pathways to practical soft and hard magnet designs.

Research from Nature Portfolio

Recent studies have developed multicomponent alloys in which coherent precipitates with controlled morphology reinforce mechanical strength without impeding domain-wall motion. By exploiting Widmanstätten-type precipitate arrays in a soft ferrimagnetic matrix, researchers have demonstrated alloys that maintain high saturation magnetisation and low coercivity at temperatures above 600 °C, offering a route to durable soft magnets for electric drive applications under harsh conditions. In complementary work, a multicomponent Fe–Co–Ni–Ta–Al alloy with embedded paramagnetic nanoparticles achieved tensile strength exceeding 1 GPa alongside sub-1 Oe coercivity, illustrating how nanoprecipitate size and coherency stress can be engineered to minimise magnetic domain-wall pinning while enhancing mechanical performance. Earlier foundational investigations employed combinatorial thin-film libraries to map phase formation and magnetic response across compositional gradients, revealing how Al content governs body-centred-cubic ordering and ferromagnetic saturation, thereby informing bulk alloy design for tailored soft magnetic properties.

Magnetic Properties of High-Entropy Alloys publication trend

The graph below shows the total number of articles in magnetic properties of high-entropy alloys across all publications each year (not limited to Nature Index journals).

Technical terms

High-entropy alloy: A metallic alloy composed of five or more principal elements mixed in near-equal proportions, leading to high configurational entropy and distinctive phase and property behaviour.

Coercivity: The intensity of applied magnetic field required to reduce the magnetisation of a ferromagnet to zero after saturation, indicative of resistance to demagnetisation.

Saturation magnetisation: The maximum magnetic moment per unit volume achievable when all magnetic domains are aligned by an external field.

Curie temperature: The critical temperature above which a ferromagnetic or ferrimagnetic material loses its spontaneous magnetisation and becomes paramagnetic.

Magnetic anisotropy: The directional dependence of a material’s magnetic properties, arising from crystallographic or shape-induced energy differences between magnetisation axes.

Magnetocaloric effect: The reversible temperature change in a magnetic material upon application or removal of an external magnetic field, utilised for solid-state refrigeration.

References

1. Strong and ductile high temperature soft magnets through Widmanstätten precipitates. Nature Communications (2023).
2. A mechanically strong and ductile soft magnet with extremely low coercivity. Nature (2022).
3. Combinatorial evaluation of phase formation and magnetic properties of FeMnCoCrAl high entropy alloy thin film library. Scientific Reports (2019).
4. Single‐Phase L10‐Ordered High Entropy Thin Films with High Magnetic Anisotropy. Advanced Science (2024).
5. Magnetic transitions in V-Fe-Co-Ni-Cu-based high entropy alloys. Materials Today Physics (2023).
6. Thermomagnetic properties and magnetocaloric effect of FeCoNiCrAl-type high-entropy alloys. AIP Advances (2019).