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Graphene for Spin-Based Computing Roland K. Kawakami, University of California-Riverside, DMR 0450037

Graphene for Spin-Based Computing Roland K. Kawakami, University of California-Riverside, DMR 0450037.

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Graphene for Spin-Based Computing Roland K. Kawakami, University of California-Riverside, DMR 0450037

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  1. Graphene for Spin-Based ComputingRoland K. Kawakami, University of California-Riverside,DMR 0450037 • Graphene is a promising material for spintronics because it is the first material to exhibit gate-tunable spin transport at room temperature. However, prior experiments show poor spin injection efficiency and unexpectedly short spin lifetimes. • In our work,1 we develop atomically-engineered insulating barriers to achieve tunneling spin injection, leading to: • Greatly enhanced spin injection efficiency. • A surprising increase of the spin lifetime (ts). This shows that the dominant spin scattering is produced by the spin detector itself, thus solving a key scientific issue in graphene spintronics. • These results enable future applications of graphene for spin-based computing. • [1] W. Han et.al., PRL, in press; arXiv: 1003.2669 A Graphene Spin Valve Without Insulating Barriers With Insulating Barriers ts = 84 ps ts = 448 ps RNL (Ω) RNL (Ω) Spin precession Spin precession Narrower spin precession curves show that insulating barriers greatly increase the spin lifetime H (T) H (T)

  2. High School Participants in ResearchRoland K. Kawakami, University of California-Riverside,DMR 0450037 This summer, high school students and teachers participated in research in our laboratory and received practical training in physics. High school student Melanie Dirks completed an 8-week internship where she participated in sample preparation, electronic measurements, and data analysis related to spin transport in graphene. She was mentored by graduate student Kathy McCreary and Greg Nakata, her high school teacher and AVID coordinator. We also supported high school teachers in a two-week UCR Physics Academy, in which teachers received training in advanced physics topics and physics research. Top: (left to right) High school student Melanie Dirks, high school teacher Greg Nakata, and graduate student Kathy McCreary gown up for the nanofabrication facility. Left: Melanie exfoliating some graphene.

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