Monday, May 5, 2008, 1:30 pm — Small Seminar Room, Bldg. 510
In this talk, I will present two topics. For the first topic, we had investigated electron spin transport in nanometer scale aluminum grains as embedded in a ferromagnet tunneling junction. We observed tunnelling-magnetoresistance (TMR) and spin valve effects. TMR strongly exhibits asymmetry with bias voltage (behaviors like spin diodes). Additionally we obtained the spin-coherence time of order in nanoseconds by using the Hanle effect. For the second topic, we investigated the dielectric response of Ba1-xSrxTiO3 (BST) (a high dielectric ferroelectrics) nanoparticles. The results were unusually found to be Debye relaxation with only a single relaxation time for the dielectric response, and the relaxation time exhibits the Arrhenius law at temperatures below 200K.
Hosted by: Igor Zaliznyak
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