期刊
PHYSICAL REVIEW LETTERS
卷 120, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.120.227202
关键词
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资金
- EPSRC [EP/N032128/1]
- National Natural Science Foundation of China [11604169]
- EPSRC [EP/N032128/1] Funding Source: UKRI
Magnetic skyrmions in noncentrosymmetric helimagnets with D-n symmetry are Bloch- type magnetization swirls with a helicity angle of +/- 90 degrees. At the surface of helimagnetic thin films below a critical thickness, a twisted skyrmion state with an arbitrary helicity angle has been proposed; however, its direct experimental observation has remained elusive. Here, we show that circularly polarized resonant elastic x-ray scattering is able to unambiguously measure the helicity angle of surface skyrmions, providing direct experimental evidence that a twisted skyrmion surface state also exists in bulk systems. The exact surface helicity angles of twisted skyrmions for both left-and right-handed chiral bulk Cu2OSeO3, in the single as well as in the multidomain skyrmion lattice state, are determined, revealing their detailed internal structure. Our findings suggest that a skyrmion surface reconstruction is a universal phenomenon, stemming from the breaking of translational symmetry at the interface.
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