Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 28: Spin Dynamics and Transport: Domain Walls

MA 28.2: Vortrag

Dienstag, 21. März 2017, 14:15–14:30, HSZ 401

Chiral domain walls in low dimensional Co heterostructures — •Jonathan Chico¹, Konstantinos Koumpouras², Lars Bergqvist^3,4, and Anders Bergman² — ¹Peter Grünberg Institut and Institute of Advanced Simulation, Forschungszentrum Jülich & JARA, D-52428, Jülich, Germany — ²Department of Physics and Astronomy, Materials Theory Division, Uppsala University, Box 516, SE-75120 Uppsala, Sweden — ³Department of Materials and Nano Physics, School of Information and Communication Technology, KTH Royal Institute of Technology, Electrum 229, SE-16440 Kista, Sweden — ⁴SeRC (Swedish e-Science Research Center), KTH Royal Institute of Technology, SE-10044 Stockholm, Sweden

Recently relativistic effects in domain wall dynamics have come to the forefront in ultra thin magnetic layers in contact with heavy metals, where domain wall motion against the electron flow has been observed, phenomena which cannot be explained only by the volume spin transfer torque (STT)[1].

From the first principles point of view we investigate Co thin films in contact with substrates composed of 4d and 5d elements. The substrate is observed to play a major role in the magnetocrystalline anisotropy and the Dzyaloshinskii-Moriya interactions (DMI). Atomistic spin dynamics simulations making use of these parameters, showcase how the chiral nature of the domain walls present in these systems, in combination with the Spin Hall Effect, can describe the recent experimental findings.

[1] Kwang-Su Ryu et. al Nature Nanotech., 8, 527 (2013)