Magnetic structures in Co-Cr media for perpendicular magnetic recording

J.C. Lodder

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    Abstract

    High bit densities have been demonstrated in longitudinal as well as in perpendicular magnetic recording. For the latter an area density of more than 12 Gbit/in2 has been obtained in a sputtered Co-Cr-Ta hard disk with a soft magnetic underlayer recorded with a special single pole head. In this paper the role of microstructure and morphology in relation to the compositional separation is discussed. Very sensitive anomalous Hall measurements have been performed from submicron Co-Cr samples to obtain more detail information about the reversal characteristics of the material. The results obtained have been used in our model for micromagnetic simulations. One of the conclusions is that most of the magnetic entities reversing their magnetisations are much smaller than the volume of one Co-Cr column.
    Original languageEnglish
    Pages (from-to)238-248
    Number of pages11
    JournalJournal of magnetism and magnetic materials
    Volume159
    Issue number1-2
    DOIs
    Publication statusPublished - 1996

    Keywords

    • Magnetic structures
    • Magnetization reversal
    • AHE measurements
    • MFM
    • Micromagnetism
    • Co-Cr
    • Coercivity
    • SMI-MAT: MATERIALS
    • SMI-TST: From 2006 in EWI-TST

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