	US 7,499,248 B2
	Magnetic detective head comprising free layer
Masahiko Ishizone, Niigata-ken (Japan); Masamichi Saito, Niigata-ken (Japan); Yosuke Ide, Niigata-ken (Japan); and Naoya Hasegawa, Niigata-ken (Japan)
Assigned to TDK Corporation, Tokyo (Japan)
Filed on Mar. 10, 2006, as Appl. No. 11/373,575.
Claims priority of application No. 2005-068874 (JP), filed on Mar. 11, 2005.
Prior Publication US 2006/0203398 A1, Sep. 14, 2006
Int. Cl. G11B 5/39 (2006.01)

U.S. Cl. 360—324.12

9 Claims

1. A magnetic detecting element comprising:

a multilayer film that has a fixed magnetic layer, a magnetization direction of which is fixed in one direction, and a free magnetic layer formed on the fixed magnetic layer with a nonmagnetic material layer therebetween, a current flowing in a direction perpendicular to a film surface of each layer of the multilayer film,

wherein the free magnetic layer has a laminated body of a Co₂MnZ alloy layer (Z is one or more elements selected from a group consisting of Al, Sn, In, Sb, Ga, Si, Ge, Pb, and Zn) and a Co_aFe_100-aalloy layer (‘a’ indicates composition ratio, 76≤a≤100), and the Co_aFe_100-aalloy layer is in contact with the nonmagnetic material layer.