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Perpendicular recording is less area intensive then longitudinal and is the primary method for recording and storing data because of this. Another aspect of recording media that is important is the type of material that is used. There are soft and hard materials. Soft materials are named such due to their low coercivity (ability to be demagnetized) and are typically implemented in shielding applications. Hard materials have a high coercivity and are called permanent magnets due to the relatively high energy needed to demagnetize them. Recording media is in the form of thin magnetic layers of hard materials able to be used for perpendicular writing. A few of the hard materials used for magnetic recording media include: CoPt, CoPd, CoC, CoNi, CoFe, CoP and FePt.1 In the pursuit of high density recording media (magneto-optical recording2 and perpendicular magnetic recording3, 4) as well as hard magnetic components in microelectro-mechanical systems5 (MEMS), CoPt alloys have prevailed as being one of the best possible choices.6-11 This is due to a variety of reasons. Co itself also has uniaxial symmetry, meaning that it has a single optical axis which enables light to pass through unhindered, making it an ideal candidate for digital media storage. The alloying of Pt to Co also increases the magnetocrystalline anisotropy of the Co. CoPt particles have a small grain size which is fundamental in having small recording bits.12-14 Additionally, CoPt has high coercivity and acceptable remanence, which are necessary magnetic properties.15, 16 CoPt films are ideal as layers and alloys for “ultra high density” magnetic recording media due to their high magnetic anisotropy, high coercivity, chemical stability and resistance to corrosion.17-19 79PDF Image | Supercritical Fluid Deposition Of Thin Metal Films
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