Room-Temperature Magnetoresistance in Nanojunctions Consisting of C8-BTBT Molecules Sandwiched Between Two Magnetic Thin-Film Edges

We fabricate magnetic nanojunctions using Ni
78
Fe
22
(Py) thin-film edges which sandwich the high-mobility molecules, 2,7-dioctyl[1] benzothieno[3,2-b][1]benzothiophene (C8-BTBT) and investigate spin transport properties. As a result, a clear positive magnetoresistance (MR) effect is observed in Py/C8-BTBT/Py nanojunctions at room temperature. In addition, the observed positive MR effect can reveal that the magnetization curves of the thin-film edges are different from those of the thin film measured by magneto-optic Kerr effect spectroscopy. These findings offer a new insight into high-mobility molecular nano-spintronics, leading to the creation of functional spin devices.