Designing layered 2D skyrmion lattices in moir\'e magnetic hetero-structures

• URL: http://arxiv.org/abs/2302.01074v2
• Date: Thu, 8 Jun 2023 07:12:14 GMT
• Title: Designing layered 2D skyrmion lattices in moir\'e magnetic hetero-structures
• Authors: Bilal Jabakhanji and Doried Ghader
• Abstract summary: We study the potential of moir'e magnetic heterostructures to generate skyrmion lattices from stacking-dependent magnetism in 2D magnets. Our findings suggest the possibility of creating colorful skyrmion lattices in moir'e magnetic heterostructures.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Skyrmions are promising for the next generation of spintronic and magnonic devices, but their zero-field stability and controlled nucleation through chiral interactions remain challenging. In this theoretical study, we explore the potential of moir\'e magnetic heterostructures to generate ordered skyrmion lattices from the stacking-dependent magnetism in 2D magnets. We consider heterostructures formed by twisting ultrathin CrBr_3 films on top of CrI_3 substrates, assuming a moderate interfacial Dzyaloshinskii-Moriya interaction. At large moir\'e periodicity and appropriate substrate thickness, a moir\'e skyrmion lattice emerges in the interfacial CrBr_3 layer due to the weaker exchange interactions in CrBr_3 compared to CrI_3. This lattice is then projected to the remaining layers of the CrBr_3 film via emergent chiral interlayer fields. By varying the pristine stacking configurations within the ultrathin CrBr_3 film, we realize layered ferromagnetic and antiferromagnetic skyrmion lattices without the need for a permanent magnetic field. Our findings suggest the possibility of creating colorful skyrmion lattices in moir\'e magnetic heterostructures, enabling further exploration of their fundamental properties and technological relevance.

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