Magnetization reversal of Co/Pd multilayers on nanoporous templates
1 Department of Applied Physics, National University of Kaohsiung, Kaohsiung 811, Taiwan, Republic of China
2 Department of Materials Science and Engineering, National Tsing-Hua University, Hsin-Chu 300, Taiwan, Republic of China
3 Graduate Institute of Applied Science and Engineering, Fu Jen Catholic University, Taipei 24205, Taiwan, Republic of China
4 Department of Applied Physics, National Ping Tung University of Education, Ping Tung 900, Taiwan, Republic of China
Nanoscale Research Letters 2012, 7:41 doi:10.1186/1556-276X-7-41Published: 5 January 2012
By making use of an e-beam deposition system, the [Co(2 Å)/Pd(10 Å)]15 multilayers were prepared on a Si(100) substrate and anodized aluminum oxide [AAO] templates with average pore diameters of around 185, 95, and 40 nm. The mechanism of magnetization reversal of the Co/Pd multilayers was investigated. Wall motion was observed on the Co/Pd multilayers grown on the Si substrate. A combination of wall motion and domain rotation was found in the sample grown on the AAO template with a 185-nm pore diameter. For the samples grown on the AAO templates with pore diameters of around 95 and 40 nm, the reversal mechanism was dominated by domain rotation. The rotational reversal was mainly contributed from the underlying nanoporous AAO templates that provided an additional pinning effect.
PACS: 75.30.Gw, magnetic anisotropy; 78.67.Rb, nanoporous materials; 75.60.Jk, magnetization reversal mechanisms.