Ferromagnetic Resonance in Thin Film Materials and Systems
Summary
Ferromagnetic resonance (FMR) is a cornerstone technique for probing magnetisation dynamics in ultrathin ferromagnetic layers and heterostructures. By applying a high‐frequency magnetic field and monitoring the resonant absorption, researchers characterise key parameters such as the resonance frequency, linewidth and damping mechanisms. These insights underpin advances in spintronic devices, microwave components and data storage technologies, where precise control of magnetic relaxation and anisotropy is essential. In thin film form, interfacial effects, crystallographic quality and layer composition all influence the resonance conditions, enabling deliberate tuning of frequency bands from the S to Ku ranges. Contemporary research spans fundamental studies of magnetic damping tensors to the engineering of heterostructures for ultralow energy losses and high operational speeds.
Research from Nature Portfolio
Recent studies have revealed pronounced anisotropy of damping in Ta/CoFeB/MgO trilayers by correlating ferromagnetic resonance linewidths with magnetisation orientation. A fourfold symmetry arising from two-magnon scattering was distinguished from a twofold term linked to in-plane magnetic anisotropy and spin–orbit coupling in the ferromagnetic layer. These findings offer a pathway to tailor directional damping for next-generation memory and oscillator devices. In a complementary line of enquiry, epitaxial Co25Fe75 films with exceptional crystallinity have demonstrated record low damping constants below 1.4 × 10^−3. Such performance rivals that of high‐quality insulating garnets and opens the door to charge-based spin-transfer-torque applications, benefiting from both metallic conductivity and minimal magnetic losses.
Ferromagnetic Resonance in Thin Film Materials and Systems publication trend
The graph below shows the total number of articles in ferromagnetic resonance in thin film materials and systems across all publications each year (not limited to Nature Index journals).
Technical terms
Ferromagnetic resonance: Resonant absorption of microwave radiation by the precessional motion of magnetisation in a ferromagnetic material.
Gilbert damping: Phenomenological parameter quantifying intrinsic energy loss during magnetisation precession.
Two-magnon scattering: Extrinsic relaxation mechanism in which uniform precession couples to degenerate spin waves via defects or interfaces.
Spin–orbit coupling: Interaction between an electron’s spin and its orbital motion, influencing magnetic anisotropy and damping.
In-plane magnetic anisotropy (IMA): Directional dependence of magnetic energy within the film plane, dictating easy and hard magnetisation axes.
Spin pumping: Transfer of spin angular momentum from a precessing ferromagnet into adjacent nonmagnetic layers, contributing to non-local damping.
References
- Manipulating Magnetic Damping of Fe/GeTe Heterostructures by Band Engineering. Advanced Science (2024).
- Thickness-Dependent Gilbert Damping and Soft Magnetism in Metal/Co-Fe-B/Metal Sandwich Structure. Nanomaterials (2024).
- Anisotropy of magnetic damping in Ta/CoFeB/MgO heterostructures. Scientific Reports (2023).
- Metallic ferromagnetic films with magnetic damping under 1.4 × 10−3. Nature Communications (2017).
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