Spin-resolved inelastic electron scattering by spin waves in noncollinear magnets

Abstract

Topological non-collinear magnetic phases of matter are at the heart of many proposals for future information nanotechnology, with novel device concepts based on ultra-thin films and nanowires. Their operation requires understanding and control of the underlying dynamics, including excitations such as spin-waves. So far, no experimental technique has attempted to probe large wave-vector spin-waves in non-collinear low-dimensional systems. In this work, we explain how inelastic electron scattering, being suitable for investigations of surfaces and thin films, can detect the collective spin-excitation spectra of non-collinear magnets. To reveal the particularities of spin-waves in such non-collinear samples, we propose the usage of spin-polarized electron-energy-loss spectroscopy augmented with a spin-analyzer. With the spin-analyzer detecting the polarization of the scattered electrons, four spin-dependent scattering channels are defined, which allow to filter and select specific spin-wave modes. We take as examples a topological non-trivial skyrmion lattice, a spin-spiral phase and the conventional ferromagnet. Then we demonstrate that, counter-intuitively and in contrast to the ferromagnetic case, even non spin-flip processes can generate spin-waves in non-collinear substrates. The measured dispersion and lifetime of the excitation modes permit to fingerprint the magnetic nature of the substrate.

arXiv comment16 pages, 8 figures, supplementary materials including videos

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Cited by in corpus (28)

• Quantum magnonics: when magnon spintronics meets quantum information science
• The interplay of Dzyaloshinskii-Moriya and Kitaev interactions for magnonic properties of Heisenberg-Kitaev honeycomb ferromagnets
• Nonreciprocity of spin waves in noncollinear magnets due to the Dzyaloshinskii-Moriya interaction
• Giant effective damping of octupole oscillation in an antiferromagnetic Weyl semimetal
• Spin excitation spectra in helimagnetic states: proper-screw, cycloid, vortex crystal, and hedgehog lattice
• Topological Superconductivity Mediated by Skyrmionic Magnons
• Modelling spin waves in noncollinear antiferromagnets: spin-flop states, spin spirals, skyrmions and antiskyrmions
• Magnonic Weyl states in Cu2OSeO3
• Topological magnons driven by the Dzyaloshinskii-Moriya interaction in the centrosymmetric ferromagnet Mn${}_5$Ge${}_3$
• Complex magnetic structure and spin waves of the noncollinear antiferromagnet Mn5Si3
• Skyrmion crystals in centrosymmetric triangular magnets under hexagonal and trigonal single-ion anisotropy
• Quantum fluctuations in the order parameter of quantum skyrmion crystals
• Quantum topological phase transitions in skyrmion crystals
• Effective damping enhancement in noncollinear spin structures
• Complex magnetism of B20-MnGe: from spin-spirals, hedgehogs to monopoles
• Signatures of a liquid-crystal transition in spin-wave excitations of skyrmions
• Localized spin waves in isolated $k\pi$ skyrmions
• Magnon spectrum of altermagnets beyond linear spin wave theory: Magnon-magnon interactions via time-dependent matrix product states vs. atomistic spin dynamics
• Topological Hybrids of Magnons and Magnon Bound Pairs
• Manipulating growth and propagation of correlations in dipolar multilayers: From pair production to bosonic Kitaev models
• Spin-waves in the collinear antiferromagnetic phase of Mn$_\bf{5}$Si$_\bf{3}$
• An overview of the spin dynamics of antiferromagnetic Mn${}_5$Si${}_3$
• Systematic Mapping of Altermagnetic Magnons by Resonant Inelastic X-Ray Circular Dichroism
• Topological superconductivity mediated by magnons of helical magnetic states
• A spin model for intrinsic antiferromagnetic skyrmions on a triangular lattice
• Complex magnetism of the two-dimensional antiferromagnetic Ge2F: from a Néel spin-texture to a potential antiferromagnetic skyrmion
• Spin structures and phase diagrams of the spin-$\frac{5}{2}$ triangular-lattice antiferromagnet Na${}_2$BaMn(PO${}_4$)${}_2$ under magnetic field
• Momentum-space theory for topological magnons in 2D ferromagnetic skyrmion lattices