Helimagnon resonances in an intrinsic chiral magnonic crystal

Abstract

We experimentally study magnetic resonances in the helical and conical magnetic phases of the chiral magnetic insulator Cu${}_2$OSeO${}_3$ at the temperature $T$=5 K. Using a broadband microwave spectroscopy technique based on vector network analysis, we identify three distinct sets of helimagnon resonances in the frequency range 2 GHz $\le f\le$ 20 GHz. The extracted resonance frequencies are in accordance with calculations of the helimagnon bandstructure found in an intrinsic chiral magnonic crystal. The periodic modulation of the equilibrium spin direction that leads to the formation of the magnonic crystal is a direct consequence of the chiral magnetic ordering caused by the Dzyaloshinskii-Moriya interaction. The opening of magnon band-gaps allows for excitation of helimagnons with wave vectors that are multiples of the spiral wave vector.

arXiv commentAccepted on November 9th, 2017 for publication at Physical Review Letters (https://journals.aps.org/prl/accepted/5607dY38Rcf14865a08e67543fa3d1c6d0df92c65)

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Cited by in corpus (20)

• Magnetic texture based magnonics
• Skyrmion dynamics in a frustrated ferromagnetic film and current-induced helicity locking-unlocking transition
• Microwave spectroscopy of the low-temperature skyrmion state in Cu2OSeO3
• Spin-resolved inelastic electron scattering by spin waves in noncollinear magnets
• Field dependence of non-reciprocal magnons in chiral MnSi
• Weak crystallization of fluctuating skyrmion textures in MnSi
• Note: Derivative divide, a method for the analysis of broadband ferromagnetic resonance in the frequency domain
• Magnon-photon coupling in a non-collinear magnetic insulator Cu${}_2$OSeO${}_3$
• Ferromagnetic resonance with magnetic phase selectivity by means of resonant elastic x-ray scattering on a chiral magnet
• Signatures of a liquid-crystal transition in spin-wave excitations of skyrmions
• Robust formation of nanoscale magnetic skyrmions in easy-plane thin film multilayers with low damping
• All-electrical detection of skyrmion lattice state and chiral surface twists
• Tunable Cooperativity in Coupled Spin--Cavity Systems
• Coupling of ferromagnetic and antiferromagnetic spin dynamics in Mn${}_2$Au/NiFe thin-film bilayers
• Confined dipole and exchange spin waves in a bulk chiral magnet with Dzyaloshinskii-Moriya interaction
• Topological Defect Mediated Helical Phase Reorientation by Uniaxial Stress
• Time-resolved measurement of spin excitations in Cu${}_2$OSeO${}_3$
• Hybrid magnetization dynamics in ${\text{Cu}}_{\text{2}}{\text{OSeO}}_{\text{3}}$/$\mathrm{NiFe}$ heterostructures
• Observation of distorted tilted conical phase at the surface of a bulk chiral magnet with resonant elastic x-ray scattering
• Controlling Skyrmion Lattices via Strain: Elongation, Tilting, and Collapse Mechanisms