Unveiling the role of Fe_(3)O_(4)in polymer spin valve near Verwey transition  

作　　者：Shuaishuai Ding Yuan Tian Xiang Liu Ye Zou Huanli Dong Wenbo Mi Wenping Hu 

机构地区：[1]Tianjin Key Laboratory of Molecular Optoelectronic Sciences,Department of Chemistry,School of Sciences,Tianjin University,Tianjin 300072,China [2]Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparation Technology,School of Science,Tianjin University,Tianjin 300354,China [3]Beijing National Laboratory for Molecular Sciences,Key Laboratory of Organic Solids,Institute of Chemistry,Chinese Academy of Sciences,Beijing 100190,China [4]School of Physics and Electronics,Hunan University,Changsha 410082,China [5]Collaborative Innovation Center of Chemical Science and Engineering,Tianjin 300072,China [6]Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Binhai New City,Fuzhou 350207,China

出　　处：《Nano Research》2021年第1期304-310,共7页纳米研究（英文版）

基　　金：the National Key R&D Program(Nos.2016YFB0401100,2017YFA0204503);the National Natural Science Foundation of China(Nos.91833306,21875158,51633006,51703159,51733004).The authors acknowledge the Laboratory of Microfabrication,Institute of Physics,CAS,for their assistance in electrode fabrication。

摘　　要：The spinterface formed between ferromagnetic(FM)electrode and organic materials is vital for performance optimization in organic spin valve(OSV).Half-metallic Fe_(3)O_(4)with drastic change in structure,conductivity and magnetic property near Verwey transition can serve as an intrinsic spinterface regulator.However,such modulating effect of Fe_(3)O_(4)in OSV has not been comprehensively investigated,especially below the Verwey transition temperature(Tv).Here,we highlight the important role of Fe_(3)O_(4)electrode in reliable-working and controllable Fe_(3)O_(4)/P3HT/Co polymer spin valves by investigating the magnetoresistance(MR)above and below 7V.In order to distinguish between different contributions to charge transport and related MR responses,the systematic electronic and magnetic characterizations were carried out in full temperature range.Particularly,the first-order metal-insulator transition in Fe_(3)O_(4)has a dramatic effect on the MR enhancement of polymer spin valves at 7V.Moreover,both the conducting mode transformation and MR line shape modulation could be accomplished across 7V.This research renders unique scenario to multimodal storage by external thermodynamic parameters,and further reveals the importance of spin-dependent interfacial modification in polymer spin valves.

关 键 词：polymer spin valves Fe_(3)O_(4) Verwey transition MAGNETORESISTANCE 

分 类 号：TB34[一般工业技术—材料科学与工程]