Patent ID: 7848063

Claim:
A yoke-type magnetic head for reading out magnetic information from a medium in which information is magnetically recorded in a track direction, the head comprising: a main magnetic pole which is provided on a plane perpendicular to a linear recording direction and has an opposing surface facing the medium, a saturation magnetic flux density Bs 1 , and a volume V 1 ; a sub yoke which is formed on the plane by being connected to the main magnetic pole, and has a length SYW in a direction perpendicular to the linear recording direction longer than a length SYH in a direction perpendicular to a main surface of the medium, and a saturation magnetic flux density Bs 2 and a volume V 2 , the product Bs 2 V 2 of which is larger than the product of the saturation magnetic flux density Bs 1 and the volume V 1 ; and a magnetoresistance effect film which is formed between the sub yoke and the opposing surface, and abuts the main magnetic pole.