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arXiv · 2201.10702

Nanoscale Skyrmions on a Square Atomic Lattice

Reiner Brüning·André Kubetzka·Kirsten von Bergmann·Elena Y. Vedmedenko·Roland Wiesendanger
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Abstract

Spin-polarized scanning tunneling microscopy has been applied to study non-collinear spin textures of a Mn monolayer on a four-fold symmetric W(001) substrate revealing a zero-field spin spiral ground state and two different types of rotational domain walls. With an applied magnetic field of 9 T, we observe a coexistence of the spin spiral and the skyrmion phase, even though a previous theoretical study reported that the phase transition occurs at 18 T. The skyrmions show a roughly hexagonal arrangement despite the square lattice symmetry of the W(001) substrate. Based on a reduced set of energy parameters, we are able to describe the experimental findings and to analyze the topological properties of the rotational domain walls.

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Reiner Brüning, André Kubetzka, Kirsten von Bergmann, Elena Y. Vedmedenko, Roland Wiesendanger. 2022-01-26. Nanoscale Skyrmions on a Square Atomic Lattice. https://doi.org/10.1103/physrevb.105.l241401

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