Magnetic interlayer coupling between ferromagnetic SrRuO3 layers through a SrIrO3 spacer
Abstract
A key element to tailor the properties of magnetic multilayers is the coupling between the individual magnetic layers. In case of skyrmion hosting multilayers, coupling of skyrmions across the magnetic layers is highly desirable. Here the magnetic interlayer coupling was studied in epitaxial all-oxide heterostructures of ferromagnetic perovskite SrRuO3 layers separated by spacers of the strong spin-orbit coupling oxide SrIrO3. This combination of oxide layers is being discussed as a potential candidate system to host N\'eel skyrmions. First order reversal curve (FORC) measurements were performed in order to distinguish between magnetic switching processes of the individual layers and to disentangle the signal of soft magnetic impurities from the samples' signal. Additionally, FORC investigations enabled to determine whether the coupling between the magnetic layers is ferromagnetic or antiferromagnetic. The observed interlayer coupling strength was weak for all the heterostructures, with SrIrO3 spacers between 2 monolayers and 12 monolayers thick.
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