Emergence of stable meron quartets in twisted magnets

Abstract

The investigation of twist engineering in easy-axis magnetic systems has revealed the remarkable potential for generating topological spin textures, such as magnetic skyrmions. Here, by implementing twist engineering in easy-plane magnets, we introduce a novel approach to achieve fractional topological spin textures such as merons. Through atomistic spin simulations on twisted bilayer magnets, we demonstrate the formation of a stable double meron pair in two magnetic layers, which we refer to as the "Meron Quartet" (MQ). Unlike merons in a single pair, which is unstable against pair annihilation, the merons within the MQ exhibit exceptional stability against pair annihilation due to the protective localization mechanism induced by the twist that prevents the collision of the meron cores. Furthermore, we showcase that the stability of the MQ can be enhanced by adjusting the twist angle, resulting in increased resistance to external perturbations such as external magnetic fields. Our findings highlight the twisted magnet as a promising platform for investigating the intriguing properties of merons, enabling their realization as stable magnetic quasiparticles in van der Waals magnets.

References in corpus (12)

• Magnetic 2D materials and heterostructures
• Twist engineering of the two-dimensional magnetism in double bilayer chromium triiodide homostructures
• Moiré skyrmions and chiral magnetic phases in twisted CrX${}_3$ (X $=$ I, Br, Cl) bilayers
• Properties and dynamics of meron topological spin textures in the two-dimensional magnet CrCl3
• Evidence of Noncollinear Spin Texture in Magnetic Moiré Superlattices
• Skyrmions in twisted van der Waals magnets
• Magnetization textures in twisted bilayer 2D CrX${}_3$ (X=Br, I)
• Magnetic skyrmion lattices in a novel two-dimensional twisted bilayer magnet
• Moiré-driven multiferroic order in twisted CrCl${}_3$, CrBr${}_3$ and CrI${}_3$ bilayers
• Heterobilayer moiré magnets: moiré skyrmions and the commensurate-incommensurate transition
• Whirling interlayer fields as a source of stable topological order in moiré CrI3
• Controllable magnetic domains in twisted trilayer magnets

Cited by in corpus (9)

• Programmable Magnetic Hysteresis in Orthogonally-Twisted Two-Dimensional CrSBr Magnets via Stacking Engineering
• Electric field control of moiré skyrmion phases in twisted multiferroic NiI${}_2$ bilayers
• Magnetic and ferroelectric phase diagram of twisted CrI${}_3$ layers
• Deep learning methods for Hamiltonian parameter estimation and magnetic domain image generation in twisted van der Waals magnets
• Emergence of Meron Kekulé lattices in twisted Néel antiferromagnets
• Frequency comb in twisted magnonic crystals
• Thermodynamic theory of square skyrmion lattice in tetragonal frustrated antiferromagnets
• Moiré spintronics: Emergent phenomena, material realization and machine learning accelerating discovery
• Neural Scaling Laws for Deep Regression