Niklas Romming, André Kubetzka, Christian Hanneken, Kirsten von Bergmann, and Roland Wiesendanger
Phys. Rev. Lett. 114, 177203 (2015)
| Spin structure of individual Skyrmion in PdFe/Ir(111). (a) Sketch of the experimental setup of a spin-polarized STM tip probing a magnetic Skyrmion. (b) Topographic constant-current SP-STM image measured with out-of-plane sensitive magnetic tip; each blue circular entity is a Skyrmion (U=+200 mV, I=1 nA, T=2.2 K, B=-1.5 T). (c) Magnetic signal (methods [22]) of two Skyrmions measured with an in-plane magnetization of the tip, m→T, revealing a two-lobe structure (U=+250 mV, I=1 nA, T=4.2 K). (d) Same area as in (c) with inverted magnetic field; due to the preserved rotational sense, the contrast is inverted. (e),(f) Line profiles across a Skyrmion along the rectangles in (c) and (d), respectively, and fits with Eq. (1) [(e) c=(0.90±0.01) nm, w=(1.18±0.02) nm; (f) c=(0.91±0.01) nm, w=(1.17±0.01) nm] and corresponding calculated out-of-plane magnetization mz. The sketches show spins with atomic distance, colorized according to the SP-STM contrast. |
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