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Determination of spin injection and transport in a ferromagnet/organic semiconductor heterojunction by two-photon photoemission

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WOS被引频次:174
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成果类型:
期刊论文
作者:
Cinchetti, Mirko;Heimer, Kathrin;Wuestenberg, Jan-Peter;Andreyev, Oleksiy;Bauer, Michael;Lach, Stefan;Ziegler, Christiane;Gao, Yongli;Aeschlimann, Martin
通讯作者:
Cinchetti, M
作者机构:
[Gao, Yongli] Cent S Univ, Dept Phys, Changsha 410083, Peoples R China.
[Gao, Yongli] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA.
[Lach, Stefan; Heimer, Kathrin; Wuestenberg, Jan-Peter; Aeschlimann, Martin; Ziegler, Christiane; Cinchetti, Mirko] Univ Kaiserslautern, Dept Phys, D-67663 Kaiserslautern, Germany.
[Lach, Stefan; Heimer, Kathrin; Wuestenberg, Jan-Peter; Aeschlimann, Martin; Ziegler, Christiane; Cinchetti, Mirko] Univ Kaiserslautern, Res Ctr OPTIMAS, D-67663 Kaiserslautern, Germany.
[Andreyev, Oleksiy; Bauer, Michael] Univ Kiel, Inst Expt & Angew Phys, D-24118 Kiel, Germany.
通讯机构:
[Cinchetti, Mirko] Univ Kaiserslautern, Dept Phys, D-67663 Kaiserslautern, Germany.
语种:
英文
关键词:
Copper phthalocyanines - Electron inelastic mean free paths - Energy loss - Ferromagnet - High-quality interfaces - In-situ - Interfacial effects - Microscopic mechanisms - Model systems - Orbitals - Organic semi conductors - Semiconductor heterojunctions - Spin flips - Spin injections - Spin transports - Spin-diffusion lengths - Spin-flip process - Spin-injection efficiencies - Spintronics devices - Still missing - Two-photon photoemissions
期刊:
Nature Materials
ISSN:
1476-1122
年:
2009
卷:
8
期:
2
页码:
115-119
文献类别:
WOS:Article;EI:Journal article (JA)
所属学科:
ESI学科类别:材料科学;WOS学科类别:Chemistry, Physical;Materials Science, Multidisciplinary;Physics, Applied;Physics, Condensed Matter
入藏号:
WOS:000263090600011;EI:20090611894548
基金类别:
NSF [DMR-0602870]; DFG [AE19/8-2]
机构署名:
本校为其他机构
院系归属:
物理与电子学院
摘要:
A fundamental prerequisite for the implementation of organic semiconductors (OSCs) in spintronics devices is the still missing basic knowledge about spin injection and transport in OSCs. Here, we consider a model system consisting of a high-quality interface between the ferromagnet cobalt and the OSC copper phthalocyanine (CuPc). We focus on interfacial effects on spin injection and on the spin transport properties of CuPc. Using spin-resolved two-photon photoemission, we have measured directly and in situ the efficiency of spin injection at the cobalt-CuPc interface. We report a spin injection efficiency of 85-90% for injection into unoccupied molecular orbitals of CuPc. Moreover, we estimate an electron inelastic mean free path in CuPc in the range of 1 nm and a 10-30 times higher quasi-elastic spin-flip length. We demonstrate that quasi-elastic spin-flip processes with energy loss &le200 meV are the dominant microscopic mechanism limiting the spin diffusion length in CuPc. ©2009 Macmillan Publishers Limited. All rights reserved.
参考文献:
Andreyev O, 2006, PHYS REV B, V74, DOI 10.1103/PhysRevB.74.195416
Dediu V, 2002, SOLID STATE COMMUN, V122, P181, DOI 10.1016/S0038-1098(02)00090-X
Djurisic AB, 2002, OPT COMMUN, V205, P155, DOI 10.1016/S0030-4018(02)01311-1
Ellis TS, 2004, J APPL PHYS, V95, P982, DOI 10.1063/1.1637137
Forrest SR, 2004, NATURE, V428, P911, DOI 10.1038/nature02498

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