Appeal No. 96-0626
Application 08/187,328
The invention relates to a magnetoresistive thin
film head (MR head) capable of reading out data recorded on a
magnetic recording medium.
Referring to Figure 1 of the drawings and page 7
lines 12-23 of the specification, the MR head includes a
substrate 50, an insulating layer 51, a shield layer 52, an
insulating layer 53, a magnetoresistive element layer 54, lead
layers 55 and 56, an insulating layer 57 and a shield layer
58. Each layer is stacked on substrate 50 in the order
recited supra.
When in use, the magnetoresistive element 54 works
like a resistor and is heated due to the sense current flowing
through it. The heat generated in magnetoresistive element 54
is radiated to the substrate 50 via insulating layers 51, 53
and 57. The maximum sense current allowable is determined by
the ability of the magnetoresistive element 54 to radiate the
heat generated. Too much heat will cause the magnetoresistive
element 54 to be fused, leading to rupture of the MR head. By
using silicon or diamond-like carbon as insulating layers 51,
53 and 57, Appel-lants have increased heat dissipation for the
magnetoresistive element 54, allowing larger sense currents to
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