Magneto-Optical Phenomena in X-Ray and Neutron Scattering
Summary
Magneto-optical phenomena in X-ray and neutron scattering encompass a suite of techniques that exploit the interaction between electromagnetic radiation or neutron beams and the magnetic structure of materials. By tuning photon or neutron energies to elemental absorption edges and utilising polarisation control, these methods access spin and orbital moments with element specificity and depth resolution. Resonant elastic X-ray scattering and circular dichroism measurements reveal multipolar order parameters and chiral arrangements, while the magneto-optical Kerr effect in the soft X-ray regime enables ultrafast tracking of magnetisation dynamics. Complementary neutron approaches, including polarised neutron diffraction and polarisation analysis, uncover parity-odd magnetic multipoles and magnetoelectric anapoles in systems ranging from weak ferromagnets to multiferroics. Together, these probes have advanced our understanding of spin–orbit coupling, Dzyaloshinskii–Moriya interactions and emergent quantum phenomena in low-dimensional and strongly correlated materials. The combination of high-brilliance synchrotron and free-electron laser sources, coupled with time-resolved detection, has opened pathways to capture femtosecond spin dynamics and to engineer next-generation spintronic devices with enhanced energy efficiency and data storage density.
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Magneto-Optical Phenomena in X-Ray and Neutron Scattering publication trend
The graph below shows the total number of articles in magneto-optical phenomena in x-ray and neutron scattering across all publications each year (not limited to Nature Index journals).
Technical terms
Resonant Elastic X-ray Scattering: A technique that enhances scattering amplitudes by tuning photon energy to an atomic absorption edge, thereby probing electronic multipoles and magnetic order.
Magneto-Optical Kerr Effect (MOKE): The rotation of the polarisation plane of reflected light induced by magnetic order, here extended into the soft X-ray regime for element-specific studies.
Circular Dichroism: Differential absorption of left and right circularly polarised radiation, used to detect chiral and magnetic properties at the atomic scale in X-ray and neutron experiments.
Polarised Neutron Diffraction: A method employing spin-polarised neutrons to distinguish magnetic from nuclear scattering and to measure complex magnetic multipoles, including anapoles.
Anapole (Dirac Dipole): A magnetoelectric multipole that is parity-odd and time-odd, observable as a basis-forbidden reflection in polarised neutron or X-ray scattering.
References
- Revealing the Absolute Direction of the Dzyaloshinskii-Moriya Interaction in Prototypical Weak Ferromagnets by Polarized Neutrons. Physical Review X (2021).
- Measurement of the Resonant Magneto-Optical Kerr Effect Using a Free Electron Laser. Applied Sciences (2017).
- Direct Observation of Anapoles by Neutron Diffraction. Physical Review Letters (2019).
- X-ray Natural Circular Dichroism Imaging of Multiferroic Crystals. Crystals (2021).
- Resonant elastic X-ray scattering: Where from? where to?. The European Physical Journal Special Topics (2012).
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