Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 41: Magnetic Coupling Phenomena

MA 41.4: Vortrag

Donnerstag, 10. März 2016, 10:15–10:30, H33

Exchange bias in epitaxial and polycrystalline thin film Ru₂MnGe / Fe bilayers — •Jan Balluff¹, Markus Meinert¹, Jan-Michael Schmalhorst¹, Günter Reiss¹, and Elke Arenholz² — ¹Center for Spinelectronic Materials and Devices, Physics Department, Bielefeld University, Germany — ²Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, USA

We report on thin film bilayers of the antiferromagnetic Heusler compound Ru₂MnGe and Fe, as well as the resulting exchange bias at low temperatures and its temperature dependence. Due to the Ru₂MnGe Néel temperature of 358K they may be valuable for potential applications in the field of spintronics. Epitaxial Ru₂MnGe / Fe bilayers show exchange bias up to 680 Oe at 3 K. Furthermore, we grew polycrystalline Ru₂MnGe showing exchange bias of the same order. Improvements have been achieved by interface doping with Mn, which increases the exchange bias by about 40% for polycrystalline samples. We discuss the differences between the epitaxial and polycrystalline films using X-ray absorption and depth analysis techniques.