Hostname: page-component-7c8c6479df-995ml Total loading time: 0 Render date: 2024-03-19T10:31:03.686Z Has data issue: false hasContentIssue false

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
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
Get access

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.

Type
Research Article
Copyright
Copyright © Materials Research Society 2010

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Naber, W. J. M., Faez, S., and Wiel, W. G. van der, J. Phys. D: Appl. Phys. 40, R205 (2007).Google Scholar
2 Sanvito, S., Nature Mater. 6, 803 (2009).Google Scholar
3 Dediu, V. A., Hueso, L. E., Bergenti, I., and Taliani, C., Nature Mater. 8, 707 (2009).Google Scholar
4 Xiong, Z. H., Wu, D., Vardeny, Z. Valy and Shi, J., Nature 427, 821 (2004).Google Scholar
5 Wang, F. J., Xiong, Z. H., Wu, D., Shi, J., and Vardeny, Z. V., Synthetic Metals 155, 172 (2005).Google Scholar
6 Wei, D. H., Hsu, Y. J., Lin, C. C., Lai, C. H., Ou, J. Y., Wu, J. C., J. Magn. Magn. Mater. 282, 49, (2004).Google Scholar
7 Xu, W., Brauer, J., Szulczewski, G., Driver, M. Sky, and Caruso, A. N., Appl. Phys. Lett. 94, 233302 (2009).Google Scholar
8 Zhan, Y. Q., Liu, X. J., Carlegrim, E., Li, F. H., Bergenti, I., Graziosi, P., Dediu, V., and Fahlman, M., Appl. Phys. Lett. 94, 053301 (2009).Google Scholar
9 Marrows, C. H., Adv. Phys. 54, 585, (2005).Google Scholar