Dresden 2017 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 3: Magnetic Textures: Statics and experimental imaging
MA 3.3: Vortrag
Montag, 20. März 2017, 10:00–10:15, HSZ 101
Metastable skyrmionic spin structures with various topologies in an ultrathin film — Levente Rózsa1, •Krisztián Palotás2,3, András Deák2, Eszter Simon2, Rocio Yanes4, László Udvardi2, László Szunyogh2, and Ulrich Nowak4 — 1Wigner Research Centre for Physics, Hungarian Academy of Sciences, Budapest, Hungary — 2Budapest University of Technology and Economics, Budapest, Hungary — 3Institute of Physics, Slovak Academy of Sciences, Bratislava, Slovakia — 4University of Konstanz, Konstanz, Germany
Metastable localized spin configurations with topological charges ranging from Q = −3 to Q = 2 are observed in a (Pt0.95Ir0.05)/Fe bilayer on Pd(111) surface by performing spin dynamics simulations, using a classical Hamiltonian parametrized by ab initio calculations [1]. It is demonstrated that the frustration of the isotropic exchange interactions is responsible for the creation of these various types of skyrmionic structures. The Dzyaloshinsky-Moriya interaction, present due to the breaking of inversion symmetry at the surface, energetically favors skyrmions with Q = −1, distorts the shape of the other skyrmionic objects, and defines a preferred orientation for them with respect to the underlying lattice. By performing spin-polarized scanning tunneling microscopy (SP-STM) calculations, a direct connection between experimentally measurable SP-STM contrasts and different topologies of skyrmionic systems is established [2].
[1] L. Rózsa et al., arXiv:1609.07012 (2016)
[2] K. Palotás et al., arXiv:1609.07016 (2016)