Electrically resistive heating device for data storage systems
View Patent ↗An electrically resistive heater in a data storage system is formed of a chemically disordered Cr x V 100−x alloy. The alloy exhibits a high temperature coefficient of resistance (T CR ) so that the heater temperature can be inferred from its resistance, minimal resistance vs. temperature hysteresis upon heating and cooling, a high melting point, and temporal stability of resistance at elevated temperatures. The resistive heater is used in data storage systems, including magnetic recording hard disk drives that uses heaters to thermally assist the recording or induce protrusion of the write head pole tips to reduce the head-disk spacing, and atomic force microscopy (AFM) based systems that use “nanoheaters” on cantilever tips for either thermally-assisted recording on magnetic media or thermo-mechanical recording on polymer-based media.
1. A magnetic recording write head for writing on magnetic media comprising:
a substrate;
a magnetic yoke on the substrate, the yoke comprising first and second pole pieces, each said pole piece having a pole tip, the pole tips being spaced-apart to define a write gap;
a coil layer located within the yoke for generating a magnetic field across the pole tips;
a resistive heater for generating heat when electrical current is applied to said resistive heater, the heater comprising an alloy consisting essentially of Cr and V and having a composition of the form Cr x V 100−x , where x is between about 50 and 90 atomic percent; and
electrical leads connected to the resistive heater for providing electrical current to heat said resistive heater, the resistive heater having a higher electrical resistance than said leads.
2. The head according to claim 1 wherein the substrate is the trailing end of an air-bearing slider.
3. The head according to claim 1 wherein the resistive heater is located in the write gap.
4. The head according to claim 1 wherein the resistive heater forms a portion of the coil layer and wherein the coil layer includes the electrical leads.
5. The head according to claim 1 wherein the resistive heater is located near the pole tipsy, whereby heat from the heater causes protrusion of the pole tips.
6. The head according to claim 1 wherein heat from the resistive heater is directed to the magnetic media.