Horizontal magnetic recording media having grains of chemically-

Details Horizontal magnetic recording media having grains of chemically- Horizontal magnetic recording media having grains of chemically-

1997-08-29

2000-07-11

Kiliman, Leszek

Stock material or miscellaneous articles

Circular sheet or circular blank

Recording medium or carrier

428 657, 428694T, 428694TM, 428694TS, 428694ST, 428900, 428336, G11B 566

Patent

active

060869747

ABSTRACT:
A horizontal magnetic recording medium that has as its magnetic film a granular film with grains of a chemically-ordered FePt or FePtX (or CoPt or CoPtX) alloy in the tetragonal L1.sub.0 structure uses an etched seed layer beneath the granular film. The granular magnetic film reveals a very high magnetocrystalline anisotropy within the individual grains. The film is produced by sputtering from a single alloy target or cosputtering from several targets. The granular structure and the chemical ordering are controlled by means of sputter parameters, e.g., temperature and deposition rate, and by the use of the etched seed layer that provides a structure for the subsequently sputter-deposited granular magnetic film. The structure of the seed layer is obtained by sputter etching, plasma etching, ion irradiation, or laser irradiation. The magnetic properties, i.e., H.sub.c and areal moment density M.sub.r t, are controlled by the granularity (grain size and grain distribution), the degree of chemical ordering, and the addition of one or more nonmagnetic materials, such as Cr, Ag, Cu, Ta, or B. The resulting granular magnetic film has magnetic properties suitable for application in high-density, horizontal magnetic recording media.

REFERENCES:
patent: 5363794 (1994-11-01), Lairson et al.
J.A. Aboaf et al, "Magnetic Properties And Structure Of Cobalt-Platinum Thin Films", IEEE Transactions On Magnetics, vol. MAG-19, No. 4, pp. 1514-1519, Jul. 1983.
J. A. Aboaf et al, "Magnetic Properties andStructure of Cobalt-Platinum Thin Films", IEEE Transactions on Magnetics, vol. MAG-19, No. 4, Jul. 1983, pp. 1514-1519.
B. M. Lairson et al., "Atomically Layered Structures for Perpendicular Magnetic Information Storage", Proceedings of Materials Research Society Symposium, vol. 343, San Francisco, CA, Apr. 4-8, 1994, pp. 359-367.
C. H. Lee et al., "Molecular-beam-epitaxial Growth and Magnetic Properties of Co-Pt Superlattices Oriented Along the [001], [110], and [111] Axes of Pt", Physical Review B, vol. 42, No. 17, Dec. 15, 1990, pp. 11384-11387.
R. A. Ristau et al., "Ordering and Grain Growth Kinetics in CoPt Thin Films", Proceedings of Materials Research Society Symposium, vol. 398, Boston, MA, Nov. 27-Dec. 1, 1995, pp. 557-562.
K. R. Coffey et al., "High Anisotrophy L1.sub.0 Thin Films for Longitudinal Recording", IEEE Transactions on Magnetics, vol. 31, No. 6, Nov. 1995, pp. 2737-2739.
M. Watanabe et al., "Microstructure and Magnetic properties of High-coercive Fe-Pt Alloy Thin Films", Materials Transactions, JIM, vol. 37, No. 3, 1996, pp. 489-493.
D. Weller et al., "Relationship Between Kerr Effect and Perpendicular Magnetic Aniotropy in Co.sub.1-x Pt.sub.x and Co.sub.1-x Pd.sub.x Alloys", Journal of Magnetism and Magnetic Materials, vol. 121, 1993, pp. 461-470.

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