Magnetic head slider

A magnetic head slider comprising:

• a heater formed on an element forming surface of the slider;
• a read element;
• a write element;
• and
• insulating layers for isolating the heater, the read element, and the write element;
• wherein the read element has a lower magnetic shield, an upper magnetic shield, and a magnetoresistive film disposed between the lower magnetic shield and the upper magnetic shield,
• wherein the heater is a heater coil that generates an induction field upon energization, the induction field acting in a track width direction coincident with a magnetizing direction of the lower magnetic shield,
• wherein the heater coil is disposed behind the lower magnetic shield, the heater coil being wired meanderingly in a direction orthogonal to a track width direction of the lower magnetic shield,
• wherein a strength of the induction field acting in the direction orthogonal to the track width direction is insufficient to influence the magnetizing direction of the lower magnetic shield.

A magnetic head slider comprising:

• a heater formed on an element forming surface of the slider;
• a read element;
• a write element;
• and
• insulating layers for isolating the heater, the read element, and the write element,
• wherein the read element has a lower magnetic shield, an upper magnetic shield, and a magnetoresistive film disposed between the lower magnetic shield and the upper magnetic shield,
• wherein the heater is a heater coil that generates an induction field upon energization, the induction field acting in a track width direction coincident with a magnetizing direction of the lower magnetic shield,
• wherein the heater coil is disposed behind and on both sides of the lower magnetic shield, the heater coil being wired meanderingly in a track width direction of the lower magnetic shield,
• wherein a strength of the induction field acting in the direction orthogonal to the track width direction is insufficient to influence the magnetizing direction of the lower magnetic shield.

A magnetic data storage device, comprising:

• a magnetic medium;
• at least one magnetic head slider for reading from and/or writing to the magnetic medium, the magnetic head slider comprising:
• a heater formed on an element forming surface of the slider;
• a read element;
• a write element;
• and
• insulating layers for isolating the heater, the read element and the write element;
• wherein the read element has a lower magnetic shield, an upper magnetic shield, and a magnetoresistive film disposed between the lower magnetic shield and the upper magnetic shield,
• wherein the heater is a heater coil that generates an induction field upon energization, the induction field acting in a track width direction coincident with a magnetizing direction of the lower magnetic shield, and
• wherein a strength of the induction field acting in a direction orthogonal to the track width direction is insufficient to influence the magnetizing direction of the lower magnetic shield;
• a drive mechanism for moving the magnetic medium across the at least one magnetic head;
• and
• a controller for controlling operation of the at least one magnetic head slider.