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Open Access Nano Express

Perpendicular Magnetic Anisotropy in FePt Patterned Media Employing a CrV Seed Layer

Hyunsu Kim1, Jin-Seo Noh1, Jong Wook Roh1, Dong Won Chun2, Sungman Kim2, Sang Hyun Jung3, Ho Kwan Kang3, Won Yong Jeong2 and Wooyoung Lee1*

Author affiliations

1 Department of Materials Science and Engineering, Yonsei University, Seoul 120-749, Korea

2 Korea Institute of Science and Technology (KIST), Seongbuk-gu, Seoul 136-761, Korea

3 Nano Process Division, Korea Advanced Nano Fab. Center, Gyeonggi 443-270, Korea

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Citation and License

Nanoscale Res Lett 2011, 6:13  doi:10.1007/s11671-010-9755-2

Published: 26 August 2010

Abstract

A thin FePt film was deposited onto a CrV seed layer at 400°C and showed a high coercivity (~3,400 Oe) and high magnetization (900–1,000 emu/cm3) characteristic of L10 phase. However, the magnetic properties of patterned media fabricated from the film stack were degraded due to the Ar-ion bombardment. We employed a deposition-last process, in which FePt film deposited at room temperature underwent lift-off and post-annealing processes, to avoid the exposure of FePt to Ar plasma. A patterned medium with 100-nm nano-columns showed an out-of-plane coercivity fivefold larger than its in-plane counterpart and a remanent magnetization comparable to saturation magnetization in the out-of-plane direction, indicating a high perpendicular anisotropy. These results demonstrate the high perpendicular anisotropy in FePt patterned media using a Cr-based compound seed layer for the first time and suggest that ultra-high-density magnetic recording media can be achieved using this optimized top-down approach.

Keywords:
FePt; CrV underlayer; Patterned media; E-beam lithography