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Chulmin Choi,Kunbae Noh,Young Oh,Cihan Kuru,Daehoon Hong,Li-Han Chen,Sy-Hwang Liou,Tae-Yeon Seong,Sungho Jin IEEE 2011 IEEE transactions on magnetics Vol.47 No.10
<P>We have investigated the magnetic M-H loop characteristics of CoCrPt-SiO<SUB>2</SUB> perpendicular recording media as influenced by nonmagnetic ion implantations. We have also developed patterned media via ion implantation using a convenient polymer nanomask approach for local control of coercivity of magnetically hard [Co/Pd]<I>n</I> multilayer film with a [Co 0.3 nm \Pd 0.8 nm] <SUB>8</SUB>/Pd 3 nm/Ta 3 nm layer structure. The CoCrPt-SiO<SUB>2</SUB> magnetic layer having perpendicular magnetic anisotropy is sputter deposited on a flat substrate. The [Co/Pd] <I>n</I> multilayer film with vertical magnetic anisotropy is deposited and the regions corresponding to the magnetic recording bit islands are coated with polymer islands using a nanoimprinting technique. Subsequent ion implantation allows patterned penetration of implanted ions into the [Co/Pd]<I>n</I> multilayer film, thus creating magnetically isolated bit island geometry while maintaining the overall flat geometry of the patterned media.</P>
( Chul Min Choi ),( Dae Hoon Hong ),( Young Oh ),( Kun Bae Noh ),( Jin Yeol Kim ),( Leon Chen ),( Sy Hwang Liou ),( Sung Ho Jin ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 ELECTRONIC MATERIALS LETTERS Vol.6 No.3
The structure and properties of nanoscale magnetic island arrays for bit patterned media (BPM) have been studied. A periodic Si nano-island array was fabricated by nano-imprint-lithography (NIL), with the trench-filling and flattening achieved by resist spin coating followed by reactive ion back-etching. A Co/Pd multilayer magnetic media with a perpendicular anisotropy was then sputtered and lifted-off so that the processed nanostructure array now has the magnetic material only on the top of the pillars. This process significantly improved the magnetic characteristics of BPM. A planarization by hydrogen silsesquioxane filling reduced the tribological interference of the protruding nanoisland heights in BPM.