Dresden 2014 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 10: Spin-dependent Transport Phenomena
MA 10.2: Vortrag
Montag, 31. März 2014, 15:15–15:30, HSZ 403
ballistic emission electron microscopy investigation of the spin filtering effect in epitaxial Fe/Au/Fe/GaAs(001) spin valve — •marie hervé1,2, sylvain tricot1, yann claveau1, sophie guézo1, sergio di matteo1, gabriel delhaye1, bruno lépine1, philippe schieffer1, and pascal turban1 — 1Département Matériaux-Nanosciences - Institut de Physique de Rennes, Rennes, France — 2Physikalisches Institut, Karlsruhe Institute of Technology (KIT),Karlsruhe, Germany
Ballistic Electron Magnetic Microscopy (BEMM) is a unique experimental tool allowing characterization of electronic properties of buried interfaces with nanometric lateral resolution. In BEMM experiments, hot electrons are injected from an STM tip into a spin-valve/semiconductor heterostructure. The measurement of the hot electron magnetocurrent collected at the back of the substrate gives access to the local magnetoconductance properties of the spin valve. In this communication, we will discuss experimental BEMM investigations on the epitaxial spin-valves Fe/Au/Fe/GaAs(001). In this structure, BEMM measurement show hot electron magnetocurrents as high as 500% at room temperature. This magnetocurrent is observed to be independant on the Fe layers thickness, and is thus dominated by interfacial effects [1]. We demonstrate that these strong magnetoconductance effects are related to the spin filtering effect at the gamma point that was predicted by Autès et al. [2]
[1] M. Hervé et al., Appl. Phy. Lett. 103 (2013) 202408 [2] G. Autès et al., Phys. Rev. B 83 (2011) 052403.