Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1998-01-08
1999-12-14
Kiliman, Leszek
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428694TS, 428694TP, 428694TM, 428336, 428900, G11B 566
Patent
active
060014474
ABSTRACT:
The magnetic storage apparatus has a high reliability at a recording density of 2 gigabits or more per square inch. The longitudinal recording media necessary to realize the apparatus has a low media noise and is immune from the influence of thermal fluctuations. The magnetic storage apparatus has a longitudinal magnetic recording media including a magnetic layer which is formed on a substrate via a multi-layered underlayer; a driver for driving the recording media in a recording direction; a magnetic head including a recording section and a read-back section; a driver for moving the magnetic head relatively with respect to the longitudinal magnetic recording media; and a read/write signal processor for processing input signals to the magnetic head and output signal read-back therefrom. The read-back section of the magnetic head includes a magnetoresistive head. One layer of the multi-layered underlayer in the longitudinal magnetic recording media which is in contact with the magnetic layer has a substantially hexagonal close-packed (hcp) structure and has crystal grains whose c-axes are substantially parallel with the substrate plane.
REFERENCES:
patent: 4652499 (1987-03-01), Howard
patent: 5693426 (1997-12-01), Lee
patent: 5800931 (1998-09-01), Lee
E.P. Wohlfarth, "The Coefficient of Magnetic Viscosity", J. Phys. F: Met. Phys., vol. 14, 1984, pp. L155-L159.
K. Yamanaka et al, "Magnetic Viscosity of Oriented Barium Ferrite Media", Journal of Magnetism and Magnetic Materials, vol. 127, 1993, pp. 233-240.
Hosoe Yuzuru
Igarashi Masukazu
Kanbe Tetsuya
Takahashi Yoshio
Tamai Ichiro
Hitachi , Ltd.
Kiliman Leszek
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