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CAMP: Magnetic Resonance and Pure Spin Currents: New Experimental Approaches and Novel Materials

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Ezekial Johnston-Halperin, Ohio State University
02 December 2014 from 3:30 PM to 4:30 PM
339 Davey Laboratory
Contact Name
Jie Shan
Contact Phone
(814) 865-7533
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The emerging study of pure spin currents (spin flow in the absence of charge flow), driven either by magnetic resonance or thermal gradients, has emerged as an important new frontier in the field of spintronics. One challenge of this new paradigm is establishing both experimental and theoretical connections to the existing body of work on more conventional charge-based spin currents. A second challenge is identifying which materials are best suited for this novel regime. Here, I will discuss novel device/experimental geometries and unique materials systems that provide new insights into the fundamental physics and new opportunities for potential applications of pure spin current generated via magnetic resonance. First, I will discuss the use of a metal-oxide-semiconductor (MOS; Fe/MgO/Si) tunnel injector to explore both electrical and FMR-driven spin injection within the same device via the detection of a local spin-accumulation voltage, providing the first direct comparison of these two spin injection mechanisms and providing insight into the fundamental mechanisms of spin pumping in these systems. Second, I will discuss a unique class of organic-based magnetic materials based on vanadium tetracyanoethelyne (V[TCNE]2) and its analogues. These materials have Curie temperatures as high as 600 K, sharp switching, and FMR linewidths of 1 G, comparable to the best inorganic magnets (such as yttrium iron garnet, YIG). The low temperature synthesis (50 C) and compatibility with a wide variety of substrates in this class of materials promises broad reaching spin-based and magnetoelectronic functionality.