Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 66: Poster 3

MA 66.18: Poster

Friday, March 24, 2017, 09:30–13:00, P2-OG2

In-Operando Studies of Ultrathin Magnetic Oxides: NiFe₂O₄ and La_0.7Sr_0.3MnO₃ — •Ronja Anika Heinen¹, Marek Wilhelm¹, Patrick Lömker¹, Katrin Neureiter¹, Timm Gerber¹, Andrei Gloskovskii², Wolfgang Drube², and Martina Müller¹ — ¹Forschungszentrum Jülich GmbH, PGI-6, Jülich, Germany — ²Deutsches Elektronen-Synchrotron Desy, Hamburg, Germany

Transition metal (TM) oxides exhibit a variety of physical properties due to their high tunability of spin, orbital and charge degrees of freedom. The initial way to tailor these properties is a precisely controlled growth process in order to prepare single-crystalline thin films. In the next step, electric or magnetic fields can be applied in order to tune and probe the magnetic and electric response and chemical compositions.

In our experiments, we investigate ultrathin films of the transition metal ferro(i)magnetic oxides NiFe₂O₄ (NFO) and La_0.7Sr_0.3MnO₃ (LSMO) on SrTiO₃(001) substrates. We use in-operando HAXPES with excitation energies of E= 4000−6000 eV and apply bias voltages of U=±3 V in order to analyse the electronic shifts of the chemical fingerprint of NFO and LSMO heterostructures. Furthermore, the ultra thin films are characterised in terms of electrical properties under applied in-plane and out-of-plane magnetic field. Also the magnetic response, i.e. the coercive field and saturation magnetization, are measured under applied electrical field via SQUID. The results provide insight into the interfacial band arrangement and chemical distribution of ultrathin 3d TM magnetic oxides.