Ultrahigh-Hc granular media with [CoB∕Pt]n multilayer film sputtered under Ar+O2 atmosphere

We developed a [Co∕Pt]n multilayer film for fabricating a perpendicular recording film with an ultrahigh coercivity (Hc). Adding boron into each Co layer and further introducing O2 during deposition yielded a high Hc of 1200kA∕m. Transmission electron microscopy and magnetic measurements suggested t...

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Bibliographic Details
Published inJournal of applied physics Vol. 105; no. 7
Main Authors Nemoto, Hiroaki, Takekuma, Ikuko, Araki, Ryoko, Tanahashi, Kiwamu, Nakatani, Ryoichi
Format Journal Article
LanguageEnglish
Published 01.04.2009
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Summary:We developed a [Co∕Pt]n multilayer film for fabricating a perpendicular recording film with an ultrahigh coercivity (Hc). Adding boron into each Co layer and further introducing O2 during deposition yielded a high Hc of 1200kA∕m. Transmission electron microscopy and magnetic measurements suggested that the intergranular exchange coupling was reduced to the level of conventional CoCrPt-oxide granular films. The [CoB∕Pt]n+O multilayer film is applicable to a hard magnetic layer in exchange-coupled composite media as well as energy-assisted magnetic recording media.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.3059608