Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 64: Poster 1
MA 64.35: Poster
Friday, March 24, 2017, 09:30–13:00, P2-EG
Spin Current Detection via Interface Paramagnetic Resonance — Thomas Marzi1, •Ralf Meckenstock1, Sabrina Masur2, and Michael Farle1,3 — 1Faculty of Physics, AG Farle, University Duisburg-Essen, 47057 Duisburg, Germany — 2Cavendish Laboratory, Department of Physics, Cambridge CB3 0HE, United Kingdom — 3Immanuel Kant Baltic Federal University, 236041 Kaliningrad, Russian Federation
We managed to use electron spin resonance active centers at ferromagnetic or metallic interfaces as a probe for measuring contact free pure spin currents for small spintronic devices and the temperature change at the surface of nano particles at human tissue relevant temperatures. Oleic acid is chemisorbed on surfaces of interest consisting of magnetic materials in our case Fe or FexOy or metallic or oxidized materials like Ag or TiO2, yielding paramagnetic centers detected by electron spin resonance (ESR). To show the potential of the method epitaxially grown Fe films and single crystalline nanoparticles of diameters less than 40nm were investigated. While the paramagnetic centers are at resonance, they react extremely sensitive on local changes of magnetic, crystalline or thermal parameters of their nearest neighbors. Being at the resonance of the ESR centers, we managed to switch on and off pure spin currents emitted by the microwave excited precessional motion of the magnetic moments from a ferromagnet by adjusting the angle between an external magnetic field and the sample plane. The flow of spin momentum is reflected in the microwave power dependent absorption characteristics of the ESR. (supported by DFG SPP1538)