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Microwave-induced direct spin-flip transitions in mesoscopic Pd/Co heterojunctions

: Pietsch, Torsten; Egle, Stefan; Keller, Martin; Pernau, Hans-Fridtjof; Strigl, Florian; Scheer, Elke

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New journal of physics. Online journal 18 (2016), No.9, Art. 093045, 15 pp.
ISSN: 1367-2630
Journal Article, Electronic Publication
Fraunhofer IPM ()
Break Junction; Heterostructures; Quantum Point Contact; Spin-Laser; Transport Spectroscopy

We experimentally investigate the effect of resonant microwave absorption on the magneto-conductance of tunable Co/Pd point contacts. At the interface a non-equilibrium spin accumulation is created via microwave absorption and can be probed via point contact spectroscopy. We interpret the results as a signature of direct spin-flip excitations in Zeeman-split spin-subbands within the Pd normal metal part of the junction. The inverse effect, which is associated with the emission of a microwave photon in a ferromagnet/normal metal point contact, can also be detected via its unique signature in transport spectroscopy.