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Planar organic spin valves using nanostructured Ni<sub>80</sub>Fe<sub>20</sub> magnetic contacts
AlQahtani, H.,Bryan, M.T.,Hayward, T.J.,Hodges, M.P.,Im, M.Y.,Fischer, P.,Grell, M.,Allwood, D.A. Elsevier Science 2014 Organic Electronics Vol.15 No.1
Planar organic spin valves were fabricated by evaporating organic semiconductor PTCDI-C<SUB>13</SUB> onto pairs of patterned Ni<SUB>80</SUB>Fe<SUB>20</SUB> magnetic nanowires separated by 120nm. Control over the relative alignment of magnetisation in the nanowires was achieved by including a domain wall 'nucleation pad' at the end of one of the wires to ensure a large separation in magnetic switching fields. Switching behaviour was investigated by optical and X-ray magnetic imaging. Room temperature organic magnetoresistance of -0.35% was observed, which is large compared to that achieved in vertical spin valves with similar materials. We attribute the enhanced performance of the planar geometry to the deposition of the semiconductor on top of the metal, which improves the quality of metal-semiconductor interfaces compared to the metal-on-semiconductor interfaces in vertical spin valves.