Patent ID: 7755862
Filing Date: 2010-07-13
Classification: G11B

Abstract:
1. An apparatus for writing a magnetic layer writable with either low or high coercive field strength with a magnetic head with a magnet coil and a voltage source, including a first switch between the voltage source and a first end of the magnet coil and a second switch connected to the other, second end of the magnet coil, and a current measuring device for measuring the current intensity through the magnet coil, whereby the current measuring device drives the first switch between the voltage source and the magnet coil in such a way that after the current intensity required for writing the magnetic layer with a bit writable with low coercive field strength or high coercive field strength is reached in the magnet coil, the first switch is switched off and on, and the second switch remains switched off during the writing of a bit so that the current intensity through the magnet coil does not exceed or undershoot a level required for writing.