| US 7,542,245 B2 | ||
| Composite thin-film magnetic head with non-magnetic conductive layer to balance parasitic capacitances | ||
| Takeo Kagami, Tokyo (Japan); Noriaki Kasahara, Tokyo (Japan); and Tetsuya Kuwashima, Tokyo (Japan) | ||
| Assigned to TDK Corporation, Tokyo (Japan) | ||
| Filed on Feb. 07, 2006, as Appl. No. 11/348,487. | ||
| Claims priority of application No. 2005-034280 (JP), filed on Feb. 10, 2005. | ||
| Prior Publication US 2006/0176618 A1, Aug. 10, 2006 | ||
| Int. Cl. G11B 5/265 (2006.01); G11B 5/31 (2006.01); G11B 5/39 (2006.01) | ||
| U.S. Cl. 360—317 [360/319; 360/324.2] | 10 Claims |
| 1. A composite thin-film magnetic head comprising:
a substrate;
a first insulation layer laminated on said substrate;
a magnetoresistive effect read head element formed on said first insulation layer and provided with a lower shield layer,
an upper shield layer and a magnetoresistive effect layer in which a sense current flows in a direction perpendicular to a
surface of said magnetoresistive effect layer through said upper shield layer and said lower shield layer;
a second insulation layer laminated on said magnetoresistive effect read head element;
an inductive write head element formed on said second insulation layer and provided with a lower magnetic pole layer, a recording
gap layer, an upper magnetic pole layer whose end portion is opposed to an end portion of said lower magnetic pole layer through
said recording gap layer and a write coil; and
a nonmagnetic conductive layer electrically connected with said lower shield layer and formed between said lower shield layer
and said substrate in order to increase substantially a counter electrode area formed between said lower shield layer and
said substrate,
wherein a parasitic capacitance generated between said substrate and said lower shield layer is substantially equal to a parasitic
capacitance generated between said upper shield layer and said lower magnetic pole layer.
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