Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 48: Poster Session II

MA 48.66: Poster

Donnerstag, 10. März 2016, 15:00–18:00, Poster B1

Spin-orbit coupling and perpendicular magnetic anisotropy in structural inversion asymmetric stacks — •Samridh Jaiswal^1,2, Berthold Ocker², Gerhard Jakob¹, and Mathias Kläui¹ — ¹Institut für Physik, Johannes Gutenberg-Universität Mainz, 55099 Mainz, Germany — ²SINGULUS TECHNOLOGIES AG, Hanauer Landstrasse 103, 63796 Kahl am Main, Germany

The need for low-power data storage in magnetic memory devices for next generation MRAM such as the SOT-MRAM devices requires understanding the magnetisation dynamics in materials envisioned for use in such devices. Ferromagnets (FM) sandwiched between heavy metal (HM) and oxide thin films exhibit novel chiral structures[1,2] arising from an interfacial Dzyaloshinskii-Moriya Interaction. For applications it is most interesting to achieve low threshold currents for switching the magnetic state and to utilise spin orbit torques[3] for manipulation of the magnetisation in systems with a strong perpendicular anisotropy. In this study, the domain structures formed in sputtered thin films of W/CoFeB/MgO and Ta/CoFeB/MgO lacking structural inversion symmetry are studied and their perpendicular magnetic anisotropy is investigated along with the effects of different underlayers. Financial support by the EU Marie Curie ITN project WALL is gratefully acknowledged. [1] A. Fert et al Nat. Nanotechnol. 8(3), 152-156 (2013) [2] N. S. Kiselev et al J. Phys. D. Appl. Phys. 44(39), 392001 (2011) [3] Lo Conte, R. et al Appl. Phys. Lett., 105, 122404 (2014)