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Effect of Nonmagnetic Underlayer on Structural and Magnetic Properties of CoCr-Alloy Thin Film Media
Masaaki FUTAMOTO Yoshiyuki HIRAYAMA Nobuyuki INABA Yukio HONDA Atsushi KIKUKAWA
IEICE TRANSACTIONS on Electronics
Publication Date: 2001/09/01
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Selected Papers from the 5th Asian Symposium on Information Storage Technology)
CoCr-alloy thin film media, epitaxial growth, underlayer, magnetic properties,
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Microstructures of CoCr-alloy thin film media were investigated by cross-sectional transmission electron microscopy focussing on the initial growth region of the magnetic layer grown on nonmagnetic underlayers. An introduction of nonmagnetic hcp-CoCrRu layer between an hcp-CoCrPt recording layer and an hcp- or a bcc-underlayer improved the crystallographic quality of the initial growth region. Sharp compositional distributions of alloying elements at the interfaces of a CoCrPt/CoCrRu/CrTi perpendicular medium and a CoCrPt/CoCrRu/CrTi longitudinal medium were respectively confirmed by electron energy loss spectroscopy employing a finely focussed electron beam. Coercivity and squareness of the thin film media increased by realizing good hetero-epitaxy between the nonmagnetic and the magnetic hcp-layers.