Magnetic properties of antiferromagnetically coupled antidots of Co/Pd multilayers

S. N. Piramanayagam, M. Ranjbar, H. K. Tan, W. C. Allen Poh, R. Sbiaa, T. C. Chong

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Abstract

Antidots of Co/Pd multilayers with 3-bilayers [(Co/Pd) x3] that were antiferromagnetically coupled(AFC) to (Co/Pd) x10 were fabricated and their magnetic properties were investigated. The thickness of Co in (Co/Pd) x3 was varied from 0.4 to 0.8 nm. Samples with a Co thickness of 0.8 nm in the bilayer showed a perpendicular magnetic anisotropy (PMA) when antiferromagnetically coupled to (Co/Pd) x10. On the other hand, the magnetization direction of single Co/Pd multilayers with thick Co (0.8 nm) as a reference structure (without AFC) was observed to be in plane, indicating that the PMA in (Co/Pd) x3 films with thicker Co is due to the antiferromagnetic coupling. We also carried out a systematic study on this set of thin films patterned in antidot array fabricated using nanoimprint lithography. It was found that the AFC is helpful to induce a perpendicular magnetic anisotropy in both thin film and antidot form. Such a result is interesting both from a fundamental viewpoint and also from their potential applications in spintronics devices and patterned magnetic medium.

Original languageEnglish
Article number07B916
JournalJournal of Applied Physics
Volume111
Issue number7
DOIs
Publication statusPublished - Apr 1 2012

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Piramanayagam, S. N., Ranjbar, M., Tan, H. K., Allen Poh, W. C., Sbiaa, R., & Chong, T. C. (2012). Magnetic properties of antiferromagnetically coupled antidots of Co/Pd multilayers. Journal of Applied Physics, 111(7), [07B916]. https://doi.org/10.1063/1.3678305