Magnetoelastic Dynamics in Nanoelectronic Systems

Magnetoelastic dynamics encompasses the interplay between magnetic order and mechanical deformation at the nanoscale, where elastic strain modulates spin configurations and vice versa. Central to this field is magnetostriction, the phenomenon by which a change in magnetisation induces lattice distortion, and its inverse, whereby applied stress alters magnetic anisotropy. In nanoelectronic systems, strain can be generated via piezoelectric substrates, acoustic waves or thermal expansion, enabling voltage‐controlled tuning of magnetisation without large currents. This approach underpins low‐energy non‐volatile memory elements, logic gates and interconnects that exploit strain‐mediated switching of nanomagnets. Theoretical models range from continuum micromagnetics with elastodynamic coupling to atomistic simulations of strain‐dependent anisotropy, emphasising bidirectional feedback between magnetic and elastic subsystems. Advances in high‐magnetostriction materials, engineered heterostructures and ultrafast strain pulses have expanded the design space for energy‐efficient spintronic devices, sensors and actuators. Practical realisations include strain‐controlled domain wall motion, ultralow‐energy straintronic memory and hybrid architectures marrying ferroelectric control with magnetic readout. This convergence of mechanics and magnetism promises a new generation of nanoelectronic technologies with reduced power consumption and enhanced functionality.

Research from Nature Portfolio

Reversible strain‐induced magnetisation switching in FeGa nanomagnets demonstrated deterministic toggling between bistable states in sub-300 nm magnets on a piezoelectric substrate, achieving ultra-low energy non-volatile memory without magnetic fields. Studies of bidirectional coupling in strain‐mediated multiferroic heterostructures compared unidirectional and bidirectional models, revealing that back-coupling of magnetisation to strain is essential to capture the behaviour of highly magnetoelastic materials such as Terfenol-D. Photoinduced spin dynamics in a TbCo₂/FeCo intermetallic heterostructure uncovered ultrafast strain and magneto-optical effects, with two distinct spin relaxation timescales associated with out-of-plane precession and in-plane anisotropy realignment near a spin reorientation transition. These works collectively highlight multiscale modelling and ultrafast control of magnetoelastic interactions in nanoscale devices.

Magnetoelastic Dynamics in Nanoelectronic Systems publication trend

The graph below shows the total number of articles in magnetoelastic dynamics in nanoelectronic systems across all publications each year (not limited to Nature Index journals).

Technical terms

Magnetostriction: Change in a material’s dimensions when subjected to a variation in magnetisation.

Magnetoelastic coupling: Interaction between magnetic and elastic degrees of freedom, whereby strain affects magnetic anisotropy and magnetisation induces stress.

Multiferroic heterostructure: Composite system combining ferroelectric (piezoelectric) and ferromagnetic layers to allow strain-mediated control of magnetisation by electric fields.

Domain wall: Boundary separating regions of uniform magnetisation orientation within a magnetic material.

Spin reorientation transition: Change in the preferred direction of magnetisation arising from variations in magnetic anisotropy, often induced by strain or temperature.

References

1. Reversible strain-induced magnetization switching in FeGa nanomagnets: Pathway to a rewritable, non-volatile, non-toggle, extremely low energy straintronic memory. Scientific Reports (2015).
2. Bi-directional coupling in strain-mediated multiferroic heterostructures with magnetic domains and domain wall motion. Scientific Reports (2018).
3. Photoinduced spin dynamics in a uniaxial intermetallic heterostructure TbCo2/FeCo. Scientific Reports (2020).
4. Sputter deposited Terfenol-D thin films for multiferroic applications. AIP Advances (2015).
5. Polycrystalline Terfenol-D thin films grown at CMOS compatible temperature. AIP Advances (2017).
6. Deterministic domain wall rotation in a strain mediated FeGaB/PMN-PT asymmetrical ring structure for manipulating trapped magnetic nanoparticles in a fluidic environment. RSC Advances (2023).