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Magnetic Plate Structure for Creating Circumferential Magnetic Anisotropy in Sputtered Thin Film Metal Alloy Magnetic Recording Disks

IP.com Disclosure Number: IPCOM000040974D
Original Publication Date: 1987-Apr-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Bullock, DC: AUTHOR

Abstract

The circumferential magnetic anisotropy of the magnetic layer in sputtered thin film disks can be enhanced by the use of a magnetic plate structure located between the rotating disk substrate 10 and the sputtering target 12, as shown in Fig. 1. The magnetic plate structure comprises two spaced-apart stainless steel or other nonmagnetic plates 16, 18, which are located on opposite sides of a magnetic insert 14. As shown in Figs. 2 and 3, the stainless steel plates 16, 18 and the magnetic insert 14 have spaced openings 20 through which magnetic fields are generated by magnets 22, 24. Each sector of the magnetic insert 14 has magnets 22, 24 separated by soft magnetic material 26 which provides a magnetic flux path. This results in circumferential magnetic fields between the magnets 22, 24 and across the openings 20.

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Magnetic Plate Structure for Creating Circumferential Magnetic Anisotropy in Sputtered Thin Film Metal Alloy Magnetic Recording Disks

The circumferential magnetic anisotropy of the magnetic layer in sputtered thin film disks can be enhanced by the use of a magnetic plate structure located between the rotating disk substrate 10 and the sputtering target 12, as shown in Fig. 1. The magnetic plate structure comprises two spaced-apart stainless steel or other nonmagnetic plates 16, 18, which are located on opposite sides of a magnetic insert 14. As shown in Figs. 2 and 3, the stainless steel plates 16, 18 and the magnetic insert 14 have spaced openings 20 through which magnetic fields are generated by magnets 22, 24. Each sector of the magnetic insert 14 has magnets 22, 24 separated by soft magnetic material 26 which provides a magnetic flux path. This results in circumferential magnetic fields between the magnets 22, 24 and across the openings 20. The fringing fields between the openings 20 lie substantially along the circumferential direction of the disk and orient the grains of the magnetic layer in that direction as they arrive on the substrate, thus producing the desired magnetic anisotropy in the magnetic layer of the thin film disk. The improved circumferential magnetic anisotropy reduces media noise due to magnetization ripple and dispersion.

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