Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Patent
1988-04-27
1991-05-14
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
505 1, 360110, 360115, G11B 5012
Patent
active
050161288
ABSTRACT:
An information storage device includes a magnetic recording medium, preferably supported upon a rotating disk, an electromagnetic writing device that writes magnetic patterns into the recording medium, and a superconducting quantum interference device (SQUID) that reads the magnetic patterns in the recording medium, the writing device and the SQUID preferably being mounted upon a read/write head. The SQUID as operated in its superconducting state is a highly sensitive and directional detector of the magnetic state of the recording medium, permitting it to be spaced relatively distantly from the recording medium yet read the state of small areas of the medium. Use of high temperature superconductors in the SQUID permits practical construction of the information storage device. The read/write head may support a plurality of write devices, and an array of SQUIDs can be utilized so that little or no relative movement of the read/write head is required to read and write from all tracks of the disk.
REFERENCES:
patent: 4403189 (1983-09-01), Simmonds
patent: 4454522 (1984-06-01), deLozanne
H. Bertram, "Fundamentals of the Magnetic Recording Process," Nov. 1986, Proc. of IEEE, vol. 74, No. 11.
R. H. Koch et al., "Quantum Interference Devices Made from Superconducting Thin Films," Jul. 1987, Appl. Physics Lett. vol. 51(3).
Robert P. Freese, "Optical Disks become Erasable," Feb. 1988, IEEE Spectrum.
Buchanan D. Scott
Crum Duane B.
DiIorio Mark S.
Marsden James R.
Paulson Douglas N.
Biomagnetic Technologies, Inc.
Garmong Gregory O.
Wolff John H.
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