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Magnetoresistance and Spinterface of Organic Spin Valves Based on Diketopyrrolopyrrole Polymers
Author(s) -
Zheng Yuanhui,
Feng Yaqing,
Gao Dong,
Zheng Naihang,
Li Dong,
Jiang Litong,
Wang Xiang,
Jin Kuijuan,
Yu Gui
Publication year - 2019
Publication title -
advanced electronic materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.25
H-Index - 56
ISSN - 2199-160X
DOI - 10.1002/aelm.201900318
Subject(s) - materials science , spintronics , polymer , magnetoresistance , ferromagnetism , hyperfine structure , alkyl , spin (aerodynamics) , spin valve , nanotechnology , optoelectronics , condensed matter physics , composite material , organic chemistry , magnetic field , chemistry , physics , quantum mechanics , aerospace engineering , engineering
Organic materials are proposed to be excellent spin transport layers due to their weak hyperfine and spin–orbit coupling interaction. Donor−acceptor‐type polymers PTDCNTVT‐420 and PTDCNTVT‐320 with diketopyrrolopyrrole (DPP) units are employed as the spacers in the organic spin valves, which have more advantages such as solution processing, higher mobility, and large area fabrication. The performance of polymers spin valves based on DPP units with different alkyl side chain lengths are studied. The different top ferromagnetic (FM) electrodes Co and Ni 80 Fe 20 are used for spin detection resulting in obvious distinct magnetoresistance (MR) values. The MR ratio of approaching 30% at 10 K is achieved with the Ni 80 Fe 20 electrodes using PTDCNTVT‐420 with longer alkyl side chain lengths. Moreover, the MR behaviors are observed depending on various temperatures, which are related with the FM electrodes spin injection efficiency. The direct spinterface are also investigated by transmission electron microscopy (TEM) and atomic force microscopy (AFM). In addition, the series of results indicate that the PTDCNTVT polymers can be used as good spin transport model materials and give clues for future polymers spintronic studies.