Formation of a Topological Monopole Lattice and its Dynamics in Three-dimensional Chiral Magnets
arXiv:1512.04153 · doi:10.1103/PhysRevB.94.054420
Abstract
Topologically protected swirl of the magnetic texture known as the Skyrmion has become ubiqui- tous in both metallic and insulating chiral magnets. Meanwhile the existence of its three-dimensional analogue, known as the magnetic monopole, has been suggested by various indirect experimental sig- natures in MnGe compound. Theoretically, Ginzburg-Landau arguments in favor of the formation of a three-dimensional crystal of monopoles and anti-monopoles have been put forward, however no microscopic model Hamiltonian was shown to support such a phase. Here we present strong numerical evidence from Monte Carlo simulations for the formation of a rock-salt crystal structure of monopoles and anti-monopoles in short-period chiral magnets. Real-time simulation of the spin dynamics suggests there is only one collective mode in the monopole crystal state in the frequency range of several GHz for the material parameters of MnGe.
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- Current-driven dynamics and inhibition of the skyrmion Hall effect of ferrimagnetic skyrmions in GdFeCo films
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- Hedgehog-lattice spin texture in classical Heisenberg antiferromagnets on the breathing pyrochlore lattice
- Spin excitation spectra in helimagnetic states: proper-screw, cycloid, vortex crystal, and hedgehog lattice
- Stabilization mechanisms of magnetic skyrmion crystal and multiple- states based on momentum-resolved spin interactions
- Rashba-Zener mechanism for nanoscale skyrmions and topological metals
- Square skyrmion crystal in centrosymmetric systems with locally inversion-asymmetric layers
- Phase degree of freedom and topology in multiple- spin textures
- Magnetic Hedgehog Lattice in a Centrosymmetric Cubic Metal
- Emergent skyrmion-based chiral order in zero-field Heisenberg antiferromagnets on the breathing kagome lattice
- Noncoplanar orders and quantum disordered states in maple-leaf (anti)ferromagnets
- Ultrasonic elastic responses in monopole lattice
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- Anisotropic spin model and multiple- states in cubic systems
- Hidden Topological Transitions in Emergent Magnetic Monopole Lattices
- Theory of collective excitations in the quadruple- magnetic hedgehog lattices