Precession Magnetic Sensor

Continue to vary device parameters (channel length, electrical contact material, and temperature), polymer (PEDOT and P3HT), and tunnel barrier (Al2O3) thickness for enhanced spin injection and magneto-resistance response of the non-local CFAS device structures. This study is expected to result in the fabrication of at least 5 non-local devices. This will entail making spin devices as we have been doing with the current Precessional Magnetic Sensor contract. We plan to continue to grow the Heusler alloy CFAS, characterize materials surface quality and magnetic properties, make CFAS/PDOT/Co vertical structure and explore charge and spin injection micron-sized lines. We have made devices using polymer transport to measure nonlocal magnetic response. We propose to make a systematic study of at least 5 more structures with varying surface modifications of the Heusler alloy CFAS. To date, there has not been a concerted effort to optimize spin injection across the interface by fabricating a high-quality tunnel junction. Earlier work from the literature deposited a few monolayers of Al and oxidized it to prepare the surface. Although primitive, the devices that were fabricated must have attained spin injection since they did measure both local and non-local magnetic response. We plan to use that method, as well as other more advanced variations to optimize the spin injection from an improved tunnel barrier at the surface. 2. Continue to provide weekly technical update to SRI by phone or email.