Title :
Applications of high Tc superconductors to magnetic recording heads
Author :
Dugas, Matthew ; Eidelloth, Walter ; Barnes, Frank
Author_Institution :
Adv. Res. Corp., Minneapolis, MN, USA
fDate :
11/1/1988 12:00:00 AM
Abstract :
The use of high-Tc superconductors in high-performance recording heads has been evaluated experimentally and theoretically. Head fields have been measured with Hall elements and inductive pickup loops. The measured fields of a large-scale ring head with Y1Ba2Cu3O7-x in the gap give a supergap permeability of 0.9 when compared to theory. At flying heights of 0.2 μm, the application to the 3380-type thin-film head results in a theoretical increase in the peak longitudinal field component of over 25%, while the application to the probe-type head given an increase of over 225% in the peak perpendicular field component. For a readback transducer, Josephson junctions in the form of DC-SQUIDS have been made from bulk Y1Ba2Cu3 O7-x and experimentally evaluated for application to either the ring- or probe-type head. The break-junctions SQUIDS have a sensitivity of 20 μV per flux quantum
Keywords :
SQUIDs; barium compounds; high-temperature superconductors; magnetic heads; magnetic thin film devices; yttrium compounds; 3380-type thin-film head; DC-SQUIDS; Hall elements; Josephson junctions; Y1Ba2Cu3O7-x; break-junctions SQUIDS; flying heights; head fields; high temperature superconductor; inductive pickup loops; large-scale ring head; magnetic recording heads; peak longitudinal field component; peak perpendicular field component; probe-type head; readback transducer; supergap permeability; Finite element methods; Magnetic heads; Magnetic materials; Magnetic recording; Permeability; Probes; Superconducting films; Superconducting materials; Superconducting thin films; Superconductivity;
Journal_Title :
Magnetics, IEEE Transactions on
