University of Minnesota
School of Physics & Astronomy

Academic Calendar

Tuesday, December 19th 2017
11:00 am:
Thesis Defense in 110 PAN
Speaker: Gordon Stecklein, University of Minnesota
Subject: Generation and Absorption of Pure Spin Currents Using Graphene Nonlocal Spin Valves
This is the public portion of Mr. Stecklein's thesis defense. His advisor is Paul Crowell.

In this talk I will discuss the fabrication and measurement of nanoscale devices in which a spin-polarized electrical current is used to inject spins into graphene, which then diffuse. We demonstrate the electrical detection of spins in graphene devices with micron-scale spin diffusion lengths and analyze how the spin lifetime and spin diffusion lengths are affected by electrostatic gating. The spin current absorbed by an adjacent ferromagnet is calculated and demonstrated to increase as the electrical conductance of the graphene/ferromagnet interface is improved. Quantitative modeling, including a finite element model of the spatial distribution of spins and the effect of a thin metallic island, indicates that the absorbed spin current is nearing the regime necessary for future technological applications.

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