Magnetisation reversal mechanism in Co-Cr media for perpendicular magnetic recording

S. de Haan, J.C. Lodder

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    Abstract

    In this study Co-Cr thin films with perpendicular anisotropy are investigated. Three films with values for Hc of 11, 90 and 170 kA/m have been selected for this paper. Besides the coercivily several other parameters such as the Hc/Hk, Cr-segregation, domain structure, column sizes, etc. were studied by VSM, SEM, NMR, MFM, AFM and selective etching. The anomalous Hall effect (AHE) has been used to record the hysteresis curves of submicron Hall crosses. This very sensitive technique in combination with e-beam lithography and ion-beam etching resulted in the recording of AHE hysteresis loops with dimensions of the Hall crosses as small as 0.3 × 0.3 μm2. The AHE loops of three samples, with less than 60 columns, show different micromagnetic properties. Only the sample with Hc1 = 90 kA/m shows clear steps in the curves above the noise level. The largest steps correspond with the reversal of one column and the total number of steps was five times the number of columns for this sample. The different reversal mechanisms observed by the AHE are related to the differences in structure, coercivity and domain size.
    Original languageEnglish
    Pages (from-to)321-335
    Number of pages15
    JournalJournal of magnetism and magnetic materials
    Volume168
    Issue number3
    DOIs
    Publication statusPublished - 1997

    Keywords

    • Micromagnetism
    • Reversal mechanism
    • Hall effect
    • Co-Cr
    • Thin film
    • SMI-MAT: MATERIALS
    • SMI-TST: From 2006 in EWI-TST

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