Regensburg 2019 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Magnetic Textures: Statics and Imaging II

MA 41.9: Vortrag

Donnerstag, 4. April 2019, 11:45–12:00, H37

High-resolution tunneling electron charge and spin transport theory of various skyrmions — •Krisztián Palotás — Wigner Research Center for Physics, Hungarian Academy of Sciences, Budapest, Hungary — Budapest University of Technology and Economics, Budapest, Hungary — University of Szeged, Szeged, Hungary

Based on a combined charge and vector spin transport theory [1] capable of imaging noncollinear magnetic textures on surfaces with spin-polarized scanning tunneling microscopy (SP-STM) [2], the high-resolution tunneling electron charge and coupled spin transport properties [3] of a variety of Néel- and Bloch-type skyrmions are investigated [4]. The chosen axially symmetric skyrmions belong to the same topology class, having a vorticity value of 1. It is demonstrated that the SP-STM images can be used to determine the helicity of the skyrmions. Moreover, the modified spin polarization vectors of the conduction electrons due to the local chirality of the complex spin texture are incorporated into the tunneling model. It is found that this effect modifies the apparent size of the skyrmions. These results contribute to the proper identification of topological surface magnetic objects imaged by SP-STM, and deliver important spin transfer torque vector parameters for current-induced spin dynamics.

References: [1] K. Palotás et al., Phys. Rev. B 94, 064434 (2016). [2] K. Palotás et al., Phys. Rev. B 96, 024410 (2017). [3] K. Palotás et al., Phys. Rev. B 97, 174402 (2018). [4] K. Palotás, Phys. Rev. B 98, 094409 (2018).