期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.217201
关键词
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资金
- National Key Research and Development Program of China [2017YFA0206200, 2020YFA0309400]
- Beijing Natural Science Foundation [Z190009]
- Science Center of the National Science Foundation of China [52088101]
- National Natural Science Foundation of China [11874409, 51831012, 12074257, 11804380, 12004249]
- Shanghai Sailing Program [20YF1430600]
- K. C. Wong Education Foundation [GJTD-2019-14]
- King Abdullah University of Science and Technology [ORS-2019-CRG8-4081]
- Engineering and Physical Science Research Council (UK) [EP/N032128/1]
- EPSRC [EP/N032128/1] Funding Source: UKRI
A three-dimensional singular point consisting of two oppositely aligned emergent monopoles is identified in continuous CoTb thin films, providing a platform for studying emergent electromagnetism. The observed spin twist seen in Lorentz transmission electron microscopy reveals the cross section of the superimposed three-dimensional structure. This new type of topological defect can be regarded as a superposition of an emergent magnetic monopole and an antimonopole.
A three-dimensional singular point that consists of two oppositely aligned emergent monopoles is identified in continuous CoTb thin films, as confirmed by complementary techniques of resonant elastic x-ray scattering, Lorentz transmission electron microscopy, and scanning transmission x-ray microscopy. This new type of topological defect can be regarded as a superposition of an emergent magnetic monopole and an antimonopole, around which the source and drain of the magnetic flux overlap in space. We experimentally prove that the observed spin twist seen in Lorentz transmission electron microscopy reveals the cross section of the superimposed three-dimensional structure, providing a straightforward strategy for the observation of magnetic singularities. Such a quasiparticle provides an excellent platform for studying the rich physics of emergent electromagnetism.
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