Detection system using heating element temperature oscillations
AssigneeSeagate Technology LLC
InventorsXuan Zheng, Timothy William Stoebe
Life of this patent
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Abstract
A data storage system includes a recording head and a compensating resistor. The recording head has a heating element. The compensating resistor is in electrical series with the heating element and is external to the recording head. A method includes applying an alternating current at a first angular frequency to a recording head. A voltage drop across the recording head heating element is measured. A component of the voltage drop is extracted. The component has a frequency that is three times the frequency of the first angular frequency.
Claims19
A data storage system comprising:
- a recording head that has a heating element;
- and
- a compensating resistor that is in electrical series with the heating element and that is external to the recording head;
- and
- a multiplying circuit that compensates for a difference between the resistance of the heating element and a resistance of the compensating resistor.
A method comprising:
- connecting a heating element in electrical series to a compensating resistor;
- applying an alternating current to the heating element;
- measuring a voltage drop across the heating element;
- measuring a voltage drop across the compensating resistor;
- subtracting the voltage drop across the compensating resistor from the voltage drop across the heating element.
A method comprising:
- apply an alternating current at a first angular frequency to a recording head heating element;
- measuring a voltage drop across the recording head heating element;
- and
- extracting a component of the voltage drop, the component having a frequency that is three times the frequency of the first angular frequency.
An apparatus comprising:
- a magnetic recording head including a metal element located near a close point between the magnetic recording head and an adjacent recording medium, the metal element functioning as a combined heating element and temperature sensor;
- and
- a compensating resistor that is in electrical series with the metal element and that is external to the recording head, wherein the resistance of the metal element and a resistance of the compensating resistor are at least approximately equal.
Dependencies are inferred from the claim text.