Regensburg 2022 – scientific programme

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MA: Fachverband Magnetismus

MA 35: Poster 2

MA 35.48: Poster

Thursday, September 8, 2022, 16:00–18:00, P4

Exchange-spring behavior at magnetic perovskite oxide interfaces — •Antonia Rieche, Martin Michael Koch, Michael Enders, Aurora Diana Rata, and Kathrin Dörr — Martin-Luther-Universität Halle-Wittenberg

Advances in ultrathin film deposition allow the investigation of exceptional properties at interfaces which significantly differ from those of bulk materials. A particular kind of interface coupling between magnets is the exchange spring, whose magnetic switching is distinctly different from that of exchange-bias coupling. To explore exchange springs in oxides, high quality SrRuO₃/La_0.7Sr_0.3MnO₃ (SRO/LSMO) and La_0.7Sr_0.3CoO₃ (LSCO/LSMO) bilayers were grown by pulsed laser deposition on different substrates with systematically varied layer thicknesses. Strong antiferromagnetic Mn-O-Ru or ferromagnetic Mn-O-Co exchange coupling connects the magnetic moments at the interface. An exchange spring resembling a Bloch wall is formed in the hard magnet due to a striking reduction of the magnetocrystalline anisotropy near the interface and return to bulk behavior further away from the interface. The thickness-dependent switching is analyzed to derive the exchange and anisotropy energies of the spring, its length and field-temperature phase diagram. We discuss the impact of such interfacial spin textures on magnetic switching as well as on further properties which are important for spintronics applications.