Magnetic Response of an Ultrathin Cobalt Film in Contact with an Organic Pentacene Layer

Yuet-Loy Chan, Ya-Jyuan Hung, Chia-Hao Wang, Ying-Chang Lin, Ching-Yuan Chiu, Yu-Ling Lai, Hsu-Ting Chang, Chih-Hao Lee, Y. J. Hsu, and D. H. Wei

Phys. Rev. Lett. 104, 177204 – Published 28 April 2010

Abstract

To emulate the interfacial regimes of a $Co / Pc / Co$ spin-valve structure, we fabricated ultrathin pentacene/cobalt ( $Pc / Co$ ) and cobalt/pentacene ( $Co / Pc$ ) bilayers. Through measurement of the magneto-optical Kerr effect, we found the Co layer has its magnetic properties depend strongly upon the order of deposition. Further x-ray spectroscopy and microscopy investigation indicated $Co / Pc$ was chemically stable, whereas $Pc / Co$ was reactive and exhibited complex magnetization pattern. The different chemistry and magnetic configurations at interfaces could cause additional complication for spin injection.

Received 12 November 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.177204

Authors & Affiliations

Yuet-Loy Chan¹, Ya-Jyuan Hung^1,2, Chia-Hao Wang^1,2, Ying-Chang Lin¹, Ching-Yuan Chiu¹, Yu-Ling Lai¹, Hsu-Ting Chang^1,2, Chih-Hao Lee^1,2, Y. J. Hsu^1,3,*, and D. H. Wei^1,†

¹National Synchrotron Radiation Research Center, 30076 Hsinchu, Taiwan
²Department of Engineering and System Science, National Tsing Hua University, 30013 Hsinchu, Taiwan
³Institute of Electro-Optical Science and Engineering, National Cheng Kung University, 70101 Tainan, Taiwan

^*yjhsu@nsrrc.org.tw
^†dhw@nsrrc.org.tw

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Vol. 104, Iss. 17 — 30 April 2010

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