Applied Phys. Letters 113, 192402 (2018)
L. Wysocki, R. Mirzaaghayev, M. Ziese, L. Yang, J. Schöpf, R.B. Versteeg, A. Bliesener, J. Engelmayer, András Kovács, L. Jin, F. Gunkel, R. Dittmann, P.H. M. van Loosdrecht, and I. Lindfors-Vrejoiu
Ferromagnetic multilayers with asymmetric interfaces and perpendicular magnetic anisotropy can stabilize non-trivial magnetic structures due to interfacial Dzyaloshinskii-Moriya interactions. Magnetic interlayer coupling between ferromagnetic layers separated by non-magnetic insulating spacers is an additional important ingredient for the properties of multilayers. We addressed the magnetic coupling between ferromagnetic SrRuO3 epitaxial layers separated by ultrathin spacers of SrIrO3/SrZrO3, so that inversion symmetry is broken at the top and bottom interfaces. Major and minor magnetization loops allowed us to assess the type and strength of the magnetic coupling. We inferred that the magnetic coupling of SrRuO3 layers through non-magnetic insulating interlayers (≤ 1.6 nm thick) is weakly ferromagnetic.