Magnetic Properties of Multilayer Nanostructures

Multilayer nanostructures comprise alternating thin films of magnetic and non-magnetic materials, engineered at the nanometre scale to exploit interlayer interactions and quantum confinement. Their magnetic properties emerge from a balance of exchange coupling across interfaces, magnetocrystalline anisotropy within each layer and dipolar interactions. By varying layer thickness, composition and sequence, one can tune phenomena such as oscillatory interlayer coupling, spin-density waves, exchange bias and domain-wall formation. In particular, exchange-coupled multilayers reveal stable non-collinear spin textures including helices and vortices, which are topologically protected and promising for all-spin architectures. Antiferromagnetic alignments, mediated by direct or RKKY (Ruderman–Kittel–Kasuya–Yosida) interactions, enable ultrafast switching and negligible stray fields, benefiting high-density storage and spin-torque devices. Thermal and field control of these properties opens avenues for magnetocaloric cooling, reconfigurable magnonic circuits and low-power spintronic elements. Foundational studies have demonstrated how interfacial strain and anisotropy gradients stabilise nanoscale domain walls, while modern designs exploit rare-earth/transition-metal combinations to engineer energy landscapes for tailored resonance frequencies and bias fields. Such versatility underpins a broad spectrum of applications, from magnetic random-access memory to neuromorphic computing and energy-efficient sensors.

Research from Nature Portfolio

Recent studies have uncovered topologically stable spin configurations in exchange-coupled multilayers. One investigation demonstrated the formation of continuous helical spin arrangements in rare-earth/transition-metal bilayers, revealing stable 2π domain walls at higher fields and enhanced energy density for potential nanometre-scale energy storage. Another work mapped the full magnetic phase diagram of gadolinium/nickel multilayers, showing a thickness-dependent transition to a magnetic fan state critical for understanding large magnetoresistance effects in spintronic applications. More recently, research into rare-earth/rare-earth superlattices of dysprosium and terbium layers identified superspin-glass behaviour coexisting with exchange-biased helical ground states, suggesting new routes to combine disorder and topology for robust all-spin devices.

Magnetic Properties of Multilayer Nanostructures publication trend

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

Technical terms

Exchange coupling: The magnetic interaction between adjacent layers that aligns or anti-aligns their magnetic moments across an interface.

Magnetocrystalline anisotropy: The dependence of magnetic energy on the orientation of magnetisation relative to the crystal lattice.

Exchange bias: A shift in the hysteresis loop caused by coupling between ferromagnetic and antiferromagnetic layers.

RKKY interaction: An indirect exchange mechanism mediated by conduction electrons, leading to oscillatory magnetic alignment across a spacer.

Spin-flop transition: A field-induced reorientation in antiferromagnets where opposing spins cant into a noncollinear state.

Superspin-glass: A frozen, disordered magnetic state in nanoparticle assemblies where moments lock in random orientations.

References

1. Realizing topological stability of magnetic helices in exchange-coupled multilayers for all-spin-based system. Scientific Reports (2016).
2. Magnetic coupling at rare earth ferromagnet/transition metal ferromagnet interfaces: A comprehensive study of Gd/Ni. Scientific Reports (2016).
3. Topologically stable helices in exchange coupled rare-earth/rare-earth multilayer with superspin-glass like ordering. Communications Physics (2019).
4. Stiffness in vortex—like structures due to chirality-domains within a coupled helical rare-earth superlattice. Scientific Reports (2016).
5. Mössbauer Synchrotron and X-ray Studies of Ultrathin YFeO3 Films. Magnetism (2022).
6. Magnetocaloric Effect in Nanosystems Based on Ferromagnets with Different Curie Temperatures. Journal of Experimental and Theoretical Physics (2021).
7. Tunable spin-flop transition in artificial ferrimagnets. Physical Review B (2021).