Magnetic Properties and Anisotropy in Epitaxial Thin Films

Epitaxial thin films of magnetic materials constitute a cornerstone of modern spintronics and magnetic recording technologies, owing to their precisely controlled crystallographic orientation and strain state. When a magnetic film is grown coherently on a single-crystal substrate, the resulting interplay between lattice mismatch, spin–orbit coupling and interfacial bonding gives rise to pronounced magnetocrystalline anisotropy. This anisotropy may favour magnetisation lying in the film plane (in-plane anisotropy) or perpendicular to it (perpendicular magnetic anisotropy, PMA), with profound implications for thermal stability, switching fields and domain configurations. Strain engineering and chemical templating have further expanded the design space, enabling unit-cell-thick layers with bulk-like magnetic properties, tunable magnetoelastic coefficients and chiral spin textures. Control of magnetic damping and spin-current transmission across interfaces underpins efficient spin-torque switching and the detection of spin Hall signals. Advances in epitaxial growth techniques—molecular beam epitaxy, pulsed laser deposition and sputtering—permit atomic-scale manipulation of composition and structure, opening pathways to high-density non-volatile memories, racetrack devices and strain-sensitive spintronics. Beyond applications, epitaxial films serve as model systems to unravel fundamental exchange interactions, magneto-optical phenomena and emergent topological spin states under strain and reduced dimensionality.

Research from Nature Portfolio

Recent studies have demonstrated unit-cell-thick Heusler films with robust perpendicular anisotropy achieved by chemical templating on lattice-matched underlayers. These films sustain current-driven chiral domain wall motion at velocities exceeding 120 m s⁻¹ under low current densities, evidence for a sizeable bulk Dzyaloshinskii–Moriya interaction and promising racetrack memory performance. Work on an itinerant helimagnet has revealed electrical control of spin helicity: by combining magnetic fields and pulsed currents, the handedness of the helical spin order can be reversed and read out via second-harmonic resistivity measurements, pointing to helicity as a non-volatile degree of freedom. In addition, an epitaxial MnGa nanolayer grown on a bespoke CoGa buffer exhibits a perpendicular magnetic anisotropy energy density above 5 Merg cm⁻³ together with low magnetisation. First-principles analysis shows that strain-induced lattice distortion produces a fully spin-polarised band along the tetragonal axis, laying the foundation for high-performance magnetic tunnel junctions in next-generation MRAM.

Magnetic Properties and Anisotropy in Epitaxial Thin Films publication trend

The graph below shows the total number of articles in magnetic properties and anisotropy in epitaxial thin films across all publications each year (not limited to Nature Index journals).

Technical terms

Epitaxy: Growth of a crystalline film in registry with the lattice of a single-crystal substrate.
Perpendicular magnetic anisotropy (PMA): Energetic preference for magnetisation perpendicular to the film plane.
Spin pumping: Emission of spin current from a precessing ferromagnet into an adjacent non-magnetic layer.
Dzyaloshinskii–Moriya interaction (DMI): Antisymmetric exchange that favours chiral spin textures.
Exchange bias: Unidirectional anisotropy arising at a ferromagnet–antiferromagnet interface.

References

1. Chiral domain wall motion in unit-cell thick perpendicularly magnetized Heusler films prepared by chemical templating. Nature Communications (2018).
2. Electric current control of spin helicity in an itinerant helimagnet. Nature Communications (2020).
3. Perpendicular magnetic tunnel junction with a strained Mn-based nanolayer. Scientific Reports (2016).
4. Switching of Magnetic Order via Non‐Magnetic Al Addition in FeCoNiMnAlx Films. Advanced Functional Materials (2025).
5. Magnetic anisotropy, damping, and interfacial spin transport in Pt/LSMO bilayers. AIP Advances (2016).
6. Perpendicular magnetic anisotropy in CoxMn4−xN (x = 0 and 0.2) epitaxial films and possibility of tetragonal Mn4N phase. AIP Advances (2016).