Thin film magnetic head with protrusion heater and temperature correcting resistor
A thin film magnetic head is disclosed that is capable of preventing the contact between an element portion and a recording medium and a variation in the amount of protrusion of the element portion. A thin film magnetic head includes: a reproducing element; a recording element that is formed on the reproducing element; a heater that is supplied with power and generates heat to expand at least one of the reproducing element and the recording element such that the reproducing element and/or the recording element protrude toward a recording medium; and a temperature correcting resistor that is connected in parallel to the heater and has a negative resistance temperature coefficient.
1. A thin film magnetic head comprising:
a reproducing element;
a recording element that is disposed on the reproducing element;
a heater that is supplied with power and generates heat to expand at least one of the reproducing element and the recording element such that the reproducing element and/or the recording element protrude toward a recording medium; and
a temperature correcting resistor that is connected in parallel to the heater and has a negative resistance temperature coefficient.
2. The thin film magnetic head according to claim 1 ,
wherein the temperature correcting resistor has a pair of electrode lines on both surfaces in the thickness direction thereof.
3. The thin film magnetic head according to claim 1 ,
wherein the temperature correcting resistor is provided at the rear side of a shield layer of the reproducing element in a height direction.
4. The thin film magnetic head according to claim 3 ,
wherein the temperature correcting resistor is provided between lead electrodes of the heater.
5. The thin film magnetic head according to claim 3 ,
wherein the temperature correcting resistor is connected between a pair of lead lines for connecting the lead electrodes of the heater and electrode pads formed on the surface of the head.
6. The thin film magnetic head according to claim 1 ,
wherein the temperature correcting resistor is formed of a metal oxide film containing at least one of Fe, Ni, Co, Cr, V, Mn, Mg, Cu, Ti, and Al.