Berlin 2018 – scientific programme

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MA: Fachverband Magnetismus

MA 16: Magnetic characterization techniques

MA 16.4: Talk

Tuesday, March 13, 2018, 10:15–10:30, H 0112

Detection of ferromagnetic resonance with a proximate organic light emitting diode — •Tobias Grünbaum, Sebastian Bange, Christian H. Back, and John M. Lupton — Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany

Several investigations in the newly emerging field of organic spintronics are based on structures of an organic semiconductor in combination with an adjacent ferromagnet. Prominent examples are spin pumping into an organic semiconductor [1] and organic spin valves [2].

We investigated the influence of a magnetic YIG film undergoing ferromagnetic resonance on an organic light emitting diode. Due to a bolometric effect and subsequent heat conduction from the YIG to the organic light emitting diode, the ferromagnetic resonance spectrum of the YIG is reproduced in the voltage drop across the diode. This includes the lineshape, the characteristic frequency dependence of the resonance field, as well as signatures of nonlinear phenomena. Our results show that a bolometric heating effect is the dominant influence of the ferromagnetic resonance on an organic light emitting diode at high excitation power.

[1]: Sun D., et al. Nat. Mater. 15, 863-869 (2016)

[2]: Ehrenfreund E. & Vardeny Z. V., Phys. Chem. Chem. Phys. 15, 7967-7975 (2013)