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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:
Forrest, S. R. The path to ubiquitous and low-cost organic electronic appliances on plastic. Nature 428, 911–918 (2004).
Wolf, S. A. et al. Spintronics: A spin-based electronics vision for the future. Science 294, 1488–1495 (2001).
Pramanik, S. et al. Observation of extremely long spin relaxation times in an organic nanowire spin valve. Nature Nanotech. 2, 216–219 (2007).
Dediu, V., Murgia, M., Matacotta, F. C., Taliani, C. & Barbanera, S. Room temperature spin polarized injection in organic semiconductor. Solid State Commun. 122, 181–184 (2002).
Xiong, Z. H., Wu, D., Valy Vardeny, Z. & Shi, J. Giant magnetoresistance in organic spin-valves. Nature 427, 821–824 (2004).

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