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Reconstruction of magnon eigenfunctions by X-ray magnetic vector chronoscopy
Haonan Jin1, Yuqiang Wang2, Xinyi He1
1Center for Transformative Science, State Key Laboratory of Quantum Functional Materials, ShanghaiTech Laboratory for Topological Physics, School of Physical Science and Technology, ShanghaiTech University, Shanghai, China.
Nature Nanotechnology
|May 27, 2026
Summary
Researchers developed X-ray magnetic vector chronoscopy (XMVC) to observe challenging magnon modes. This new method directly measures nanoscale vectorial eigenfunctions, providing unprecedented insight into magnetic dynamics.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Collective precession of magnetization forms magnon modes, described by complex vectorial eigenfunctions.
- Experimental observation of these eigenfunctions has been a significant challenge in magnetism research.
Purpose of the Study:
- To introduce a novel time-resolved method for observing complex-valued vectorial eigenfunctions of magnon modes.
- To enable direct measurement and reconstruction of nanoscale magnetization dynamics with high angular resolution.
Main Methods:
- Development and application of X-ray magnetic vector chronoscopy (XMVC), a time-resolved resonant scattering technique.
- XMVC achieves an angular resolution of 0.1° (±0.01°) for precise characterization of magnetization dynamics.
- Application to a synthetic antiferromagnetic multilayer (Si/NiFe/Ru/CoFeB) to study hybridized magnon modes.
Main Results:
- XMVC successfully enabled magnon state tomography, directly measuring nanoscale vectorial eigenfunctions of hybridized modes.
- The method allowed for direct access to the system's non-Hermitian Hamiltonian.
- Complex-valued coupling strengths and non-orthogonal eigenbases arising from magnon-magnon coupling were revealed.
Conclusions:
- XMVC is established as a powerful experimental platform for studying nanoscale spin systems.
- The technique provides a means to directly extract eigenfunctions, offering full access to system dynamics.
- This advancement facilitates a deeper understanding of complex magnetic phenomena at the nanoscale.
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