Maximum Magnetic Field of Thin Film Coils in Magneto-Optical Heads

概要

論文の詳細を見る
We investigated the maximum current at which coils, integrated in magneto-optical recording heads, can be operated before breakdown, effectively determining the maximum magnetic field. At too high currents, the coil breaks down: either a rupture or a short between the turns occurs. However, already at some lower current, cracks appear in the optical aperture. Due to the cracks, the aperture is optically disturbed, which reduces the optical power during writing and readout. We show that the appearance of these cracks is temperature related. The current, at which the cracking occurs, can be determined by measuring the change of resistance of the coils. This determines the maximum magnetic field the coils can generate. We show that this maximum magnetic field can be increased by adding a NiFe layer underneath the coil, or by adding Cu pads, effectively cooling the coil.
2005-05-15