Magnetoresistance Effect and the Applications for Organic Spin Valves Using Molecular Spacers

Abstract

Organic spin devices utilizing the properties of both spin and charge inherent in electrons have attracted extensive research interest in the field of future electronic device development. In the last decade, magnetoresistance effects, including giant magetoresistance and tunneling magnetoresistance, have been observed in organic spintronics. Significant progress has been made in understanding spin-dependent transport phenomena, such as spin injection or tunneling, manipulation, and detection in organic spintronics. However, to date, materials that are effective for preparing organic spin devices for commercial applications are still lacking. In this report, we introduce basic knowledge of the fabrication and evaluation of organic spin devices, and review some remarkable applications for organic spin valves using molecular spacers. The current bottlenecks that hinder further enhancement for the performance of organic spin devices is also discussed. This report presents some research ideas for designing organic spin devices operated at room temperature.

Surface-Step-Induced Magnetic Anisotropy in Epitaxial LSMO Deposited on Engineered STO Surfaces

“…The latest spintronics research heavily exploits oxide materials [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ], in which perovskites play a unique role due to their special properties [ 8 , 9 , 10 ]. One of the widely used materials is La 0.67 Sr 0.33 MnO 3 (LSMO) [ 11 , 12 , 13 , 14 , 15 , 16 ], which is characterized by a Curie temperature above room temperature (RT) and nearly 100% spin polarization of electrons at the Fermi level [ 17 ].…”

Interface-Assisted Room-Temperature Magnetoresistance in Cu-Phenalenyl-Based Magnetic Tunnel Junctions

“…Low-temperature [(LT) ∼ 80 K] in situ UHV angle deposition method combined with a 3D-mask was used to fabricate OMTJs with an effective area of 3 × 8 μm 2 . These devices show an MR ratio ∼ 10–14% without the use of oxide layers between the FM/organic interface at room temperature, which to our knowledge is one of the highest MR ratios reported. − …”

Research progress of rubrene as an excellent multifunctional organic semiconductor

“…Most organic spin valves reported have a strong temperature dependence that MR value usually decreases with increasing temperature [104,105].Therefore it is important for organic spin valves to achieve high MR response at room temperature [93,[106][107][108][109]. Zhang et al fabricated spin-valve devices with an MgO-substrate/Fe 3 O 4 /Al-O/rubrene/Co/Al stacking structure (Fig.…”