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How does an Ultrathin Cobalt Film Response to the Presence of a Neighboring Pentacene Layer

Published online by Cambridge University Press:  31 January 2011

Yuet-Loy Chan ,
Ya-Jyuan Hung ,
Chia-Hao Wang ,
Ying-Chang Lin ,
Ching-Yuan Chiu ,
Yu-Ling Lai ,
Hsu-Ting Chang ,
Chih-Hao Lee ,
Yao-Jane Hsu  and
Der-Hsin Wei
Yuet-Loy Chan
Affiliation:
ylchan@nsrrc.org.tw, National Synchrotron Radiation Research Center, Hsinchu, Taiwan, Province of China
Ya-Jyuan Hung
Affiliation:
yajyuanja@hotmail.com, National Synchrotron Radiation Research Center, Hsinchu, Taiwan, Province of China
Chia-Hao Wang
Affiliation:
chiahauwang@yahoo.com.tw, National Synchrotron Radiation Research Center, Hsinchu, Taiwan, Province of China
Ying-Chang Lin
Affiliation:
lyc@nsrrc.org.tw, National Synchrotron Radiation Research Center, Hsinchu, Taiwan, Province of China
Ching-Yuan Chiu
Affiliation:
cychiu@nsrrc.org.tw, National Synchrotron Radiation Research Center, Hsinchu, Taiwan, Province of China
Yu-Ling Lai
Affiliation:
yllai@nsrrc.org.tw, National Synchrotron Radiation Research Center, Hsinchu, Taiwan, Province of China
Hsu-Ting Chang
Affiliation:
a68118.a68118@msa.hinet.net, National Synchrotron Radiation Research Center, Hsinchu, Taiwan, Province of China
Chih-Hao Lee
Affiliation:
chlee@ess.nthu.edu.tw, National Tsing Hua University, Department of Engineering and System Science, Hsinchu, Taiwan, Province of China
Yao-Jane Hsu
Affiliation:
yjhsu@nsrrc.org.tw, National Synchrotron Radiation Research Center, Hsinchu, Taiwan, Province of China
Der-Hsin Wei
Affiliation:
dhw@nsrrc.org.tw, National Synchrotron Radiation Research Center, Hsinchu, Taiwan, Province of China
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Abstract

The interfacial regimes of cobalt/pentacene/cobalt (Co/Pc/Co) trilayers were emulated through the ultrathin pentacene/cobalt (Pc/Co) and cobalt/pentacene (Co/Pc) bilayers. Employing the magneto-optical Kerr effect (MOKE) measurement, we found the coercivity of Co bottom film in a thickness of 3.4 nm experienced a slight reduction upon the adsorption of Pc molecules. For the bilayers prepared with reversed order of deposition, the Co film deposited on a 6.4 nm Pc layer showed no observable ferromagnetic order at room temperature until its thickness reached 3 nm. After the onset of magnetic order, the x-ray images acquired on Pc/Co revealed a complicated magnetization patterns comparing to those observed on Co/Pc bilayers. Because the spin-polarized carriers will interact with the environment along their transport path, the presence of a non-magnetic layer and the occurrence of complicated domain structures suggested the spin-polarized carriers would experience a greater disturbance on their spin coherence when crossing the Pc/Co interface.

Keywords

organicspintronicmagnetic properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1198: Symposium E – Advanced Materials for Half-Metallic and Organic Spintronics , 2009 , 1198-E03-08
Copyright
Copyright © Materials Research Society 2010

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