Regensburg 2016 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 48: Poster Session II
MA 48.52: Poster
Donnerstag, 10. März 2016, 15:00–18:00, Poster B1
Investigation of thermal spin transfer torque in MgO-based magnetic tunnel junctions using FMR microresonators — •Hamza Cansever1,2, Ewa Kowalska1,2, Ciaran Fowley1, Yuriy Aleksandrov1,2, Oguz Yildirim1, Rysard Narkowicz1, Kilian Lenz1, Jürgen Lindner1, Jürgen Fassbender1, and Alina M. Deac1 — 1Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Bautzner Landstraße 400, 01328 Dresden, Germany — 2Technische Universität Dresden, Institute of Solid State Physics, 01069 Dresden, Germany
MgO-based magnetic tunnel junctions are commonly used in spintronic device applications, such as recent spin transfer torque random access memory (STT-RAM) because of their non-volatility, fast switching and high storage capacity. Spin transfer torque is defined as a spin polarized current flowing through a ferromagnet exerting a torque on the local magnetization. With thermal spin transfer torque (T-STT), thermally excited electron transport is used instead of spin polarized charge current and provides an interesting way of using thermoelectric effects in magnetic storage applications. Our study focuses on fundamental experimental research aimed at demonstrating that thermal gradients can generate spin-transfer torques in MgO-based magnetic tunnel junctions (MTJs). We use microresonators in order to analyze how the ferromagnetic resonance signal corresponding to the free layer of an in-plane MgO-based tunnel junction device is modified in the presence of a temperature gradient across the barrier. This work is supported by DFG-SPP 1538.