Shorting tolerant tunnel valve head and circuit
AssigneeInternational Business Machines Corporation
InventorsRobert G. Biskeborn, W. Stanley Czarnecki, Jason Liang, Calvin S. Lo
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Abstract
An apparatus according to one embodiment includes a magnetic head having at least two tunneling magnetoresistance sensors, where a resistance of a tunnel barrier of each of the tunneling magnetoresistance sensors of the magnetic head is about 25 ohms or less, a drive mechanism for passing a magnetic medium over the magnetic head, and a controller electrically coupled to the magnetic head. In addition, the controller includes a biasing circuit, where the biasing circuit restricts a maximum voltage drop across the tunnel barrier.
Claims25
An apparatus, comprising:
- a magnetic head having at least two tunneling magnetoresistance sensors,
- wherein a resistance of a tunnel barrier of each of the tunneling magnetoresistance sensors of the magnetic head is about 25 ohms or less;
- a drive mechanism for passing a magnetic medium over the magnetic head;
- and
- a controller electrically coupled to the magnetic head,
- wherein the controller includes a biasing circuit, wherein the biasing circuit restricts a maximum voltage drop across the tunnel barrier.
An apparatus, comprising:
- a magnetic head having at least two tunneling magnetoresistance sensors;
- a drive mechanism for passing a magnetic medium over the magnetic head;
- and
- a controller electrically coupled to the magnetic head,
- wherein the controller includes a biasing circuit, wherein the biasing circuit sets a predetermined voltage value drop for each of the tunneling magnetoresistance sensors according to the following equation:
- V
- bias
- =
- 2
-
- R
- bias
- +
- 2
-
- R
- lead
- +
- R
- sensor
- R
- sensor
- ×
- V
- sensor
- ,
- target
- ,
- wherein Vbias is a voltage set by the biasing circuit, Rbias is a resistance of the bias circuit, Rlead is a resistance of a lead, Rsensor is a resistance of the sensor, and Vsensor,target is a target value of the predetermined voltage value drop of the respective sensor.
An apparatus, comprising:
- a magnetic head having at least two tunneling magnetoresistance sensors,
- wherein a plurality of tunneling magnetoresistance sensors are present in the magnetic head in an array,
- wherein a target resistance of each tunnel barrier of the tunneling magnetoresistance sensors is about 25 ohms or less,
- wherein a stripe height of each tunnel barrier is at least ⅔ of a track width of each tunnel barrier or greater,
- wherein each sensor is configured to read a unique data track,
- wherein the sensors are configured to concurrently read the data tracks.
Dependencies are inferred from the claim text.