Patent ID: 7312951
Filing Date: 2007-12-25
Classification: G11B,Y10T

Abstract:
1. A magnetic head for perpendicular magnetic recording having an air bearing surface positioned facing a recording surface of a recording medium, which records magnetic information on said recording medium by generating magnetic flux toward said recording surface of said recording medium, the magnetic head comprising a magnetic pole which generates magnetic flux toward said recording surface of said recording medium, and a return yoke connected to said magnetic pole, wherein said magnetic pole has a pole tip provided at an air bearing surface side and a yoke section provided at an opposite side of said pole tip from the air bearing surface side, and wherein a material composing said magnetic pole has a magnetostriction constant λ of at least 0 and less than 10×10 wherein Hk represents a magnetic anisotropic field of the material (units: A/m), σ represents a stress of the material (units: MPa), λ represents a magnetostriction constant of the material, P is larger than 0.1 and less than 200, and the magnetic anisotropic field Hk of said material is greater than 1401 A/m and no larger than 20,000 A/m.