SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Thin Films: Magnetic Anisotropy

MA 17.4: Vortrag

Dienstag, 28. März 2023, 10:15–10:30, POT 6

Characteristics and origin of a SrRuO₃ exchange spring — •Martin M. Koch, Antonia Rieche, Diana A. Rata, and Kathrin Dörr — Martin-Luther-Universität Halle-Wittenberg

A particular type of strong interface coupling between magnets is the exchange spring which resembles an interface-parallel domain wall formed in one (or both) magnets. Advances in thin film growth and resulting interface quality of magnetic oxides improve chances to observe such strong exchange coupling across interfaces. Nevertheless, known exchange springs in oxides are yet scarce [1], since the unambiguous identification is not straightforward. An intensely studied model system for strong interface coupling is SrRuO₃/La_0.7Sr_0.3MnO₃ coherently grown on SrTiO₃(001) substrate. We summarize here the characteristics and suggested origin of the Bloch-type exchange spring forming at this interface in bilayers grown by pulsed laser deposition. Strikingly, the spring forms in hard-magnetic SrRuO₃ where magnetic anisotropy is suppressed within few unit cells from the interface. We suggest the transfer of oxygen octahedra rotations / tilts to be responsible, a structural coupling mechanism occurring at many other coherent oxide interfaces. Implications of the noncollinear spin configuration for spintronic functionalities will be addressed.

[1] A. M. Kane, Phys. Rev. Mater. 3, 014413 (2019)