Novel coupling layer allows detailed control over magnetic multilayers


Together with the group of Erol Girt from the Simon Fraser University in Burnaby, Canada, the group of Dieter Suess found a way to control the coupling angle in magnetic multilayers.

Magnetic multilayer systems play a key role in the development of novel storage technologies like spin-transfer torque MRAM and spin-orbit torque MRAM. Up till now, the exchange coupling of two neighboring magnetic layers could be varied in a collinear fashion only by means of the Ruderman–Kittel–Kasuya–Yosida (RKKY) interaction. By varying the iron content in a RuFe spacer layer, the group of Erol Girt from SFU, Burnaby, Canada, showed that the coupling angle can be tuned to arbitrary values by introducing a biquadratic contribution to the interface coupling. Claas Abert and Dieter Suess delivered a theoretical model to describe this novel effect. The joint work was published in Science Advances.

Science Advances  25 Nov 2020:
Vol. 6, no. 48, eabd8861
DOI: 10.1126/sciadv.abd8861

Physics of Functional Materials:
Research Platform MMM Mathematics-Magnetism-Materials:

Phase plot for noncollinear coupling due to RuFe spacer layers. (c) Claas Abert, University of Vienna, Physics of Functional Materials