Time-resolved measurement of spin excitations in Cu2OSeO3

DOI: 10.1103/PhysRevB.106.174409

Authors: D. M. Burn (Diamond Light Source) , S. L. Zhang (ShanghaiTech University) , G. Van Der Laan (Diamond Light Source) , T. Hesjedal (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 106

State: Published (Approved)
Published: November 2022
Diamond Proposal Number(s): 16043 , 17612

Abstract: Magnetic diffraction in combination with x-ray detected ferromagnetic resonance (DFMR) is a powerful technique for performing time-resolved measurements on individual spin textures. Here, we study the ferromagnetic resonance (FMR) modes of both the conical and field-polarized phases in the chiral magnet Cu 2 OSeO 3 . Following the identification of the FMR modes at different temperatures using broadband vector network analyzer FMR, we use DFMR on the crystalline (001) Bragg peak to reveal the time-dependent spin configurations of the selected FMR modes. By being able to measure both the amplitude and phase response of the spin system across the resonance, a continuous phase advance (of 180 ∘ ) in the conical mode and a phase lag (of 180 ∘ ) in the field-polarized mode is found. By performing dynamic measurements in the conical phase as a function of the linear polarization angle of the x rays, i.e., successively probing the dynamics of the moments, we find an inversion of the dynamics along the conical axis upon inverting the applied field direction. By allowing for time-resolved measurements of the phase and amplitude of individual magnetic phases, DFMR opens up new opportunities for obtaining a deeper understanding of the complex dynamics of chiral magnets.

Journal Keywords: Helimagnets; Ferromagnetic resonance; Resonant elastic x-ray scattering

Diamond Keywords: Ferromagnetism; Spintronics

Subject Areas: Materials, Physics

Diamond Offline Facilities: RASOR
Instruments: I10-Beamline for Advanced Dichroism

Added On: 10/11/2022 10:21

Documents:
PhysRevB.106.174409.pdf

Discipline Tags:

Quantum Materials Physics Electronics Magnetism Materials Science

Technical Tags:

Scattering Resonant Soft X-ray Scattering (RSXS)