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MA: Fachverband Magnetismus
MA 2: Focus Session: Nanomagnetism in the x-ray spotlight
MA 2.6: Vortrag
Montag, 12. März 2018, 12:15–12:30, H 1012
Room temperature ferromagnetism in EuO revealed by XMCD — •Patrick Lömker1, Marek Wilhelm1, Ronja Heinen1, Mai Hussein1, Andrei Gloskovskii2, Wolfgang Drube2, Peter Bencok3, Paul Steadman3, and Martina Müller1,4 — 1PGI-6, FZ Jülich GmbH, Jülich, DE — 2Photon Science, DESY, Hamburg, DE — 3DIAMOND Light Source, Oxford, GB — 4Fakultät Physik, TU Dortmund, Dortmund, DE
The Heisenberg model system EuO is both a 4f ferromagnet and an electric insulator. This rare combination exhibits both fundamentally and technologically exciting properties, however limited to T<70 K. We study interface effects between EuO and the 5d metal Pt and the itinerant 3d ferromagnet Co, enhancing TC up to room-temperature.
While electron doping is typically utilized to enhance the TC of EuO, we employ a hole-doped EuO/Pt interface instead. Pt virtual substrates are prepared on SrTiO3(001), the Pt surface state is observed by LEED. EuO is deposited using the adsorption-limited growth mode. We observe an enhanced TC with HAX-MCD and check our results with VSM. Our findings agree with a recent DFT study of a Pt/EuO/Pt system, which predicts a 2D hole gas at the EuO/Pt interface and a strong hybridization of the Eu 4f and O 2p bands.
Furthermore, we study the Co/EuO interface with XMCD. The EuO films are grown by a novel redox method on SrTiO3(001). EuO ferromagnetism at room temperature is observed and we determine the coupling strength and -length revealing a strong magnetic proximity effect between the 3d/4f ferromagnets.