期刊
PHYSICAL REVIEW B
卷 91, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.91.224407
关键词
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资金
- Institutional Computing Program at LANL
- NNSA of the US DOE at LANL [DE-AC52-06NA25396]
- US Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
We study the equilibrium phase diagram of ultrathin chiral magnets with easy-plane anisotropy A. The vast triangular skyrmion lattice phase that is stabilized by an external magnetic field evolves continuously as a function of increasing A into a regime in which nearest-neighbor skyrmions start overlapping with each other. This overlap leads to a continuous reduction of the skyrmion number from its quantized value Q = 1 and to the emergence of antivortices at the center of the triangles formed by nearest-neighbor skyrmions. The antivortices also carry a small skyrmion number Q(A) << 1 that grows as a function of increasing A. The system undergoes a first order phase transition into a square vortex-antivortex lattice at a critical value of A. Finally, a canted ferromagnetic state becomes stable through another first order transition for a large enough anisotropy A. Interestingly enough, this first order transition is accompanied by metastable meron solutions.
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