Magnetic head for perpendicular magnetic recording

• Main Authors: NOGUCHI KIYOSHI, HIRATA KEI, YAMAGUCHI ATSUSHI, ROPPONGI TETSUYA
• Format: Patent
• Language: English
• Published: 29.12.2005
• Edition: 7
• Subjects: GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

The invention provides a magnetic head for perpendicular magnetic recording having an air bearing surface positioned facing the recording surface of a recording medium, which records magnetic information on the recording medium by generating magnetic flux toward the recording surface of the recording medium, and comprises a magnetic pole which generates magnetic flux toward the recording surface of the recording medium and a return yoke having one end connected to the magnetic pole and the other end positioned facing the recording surface of the recording medium, wherein the material composing the magnetic pole has a magnetostriction constant lambda of at least 0 and less than 10x10-6, with a parameter P represented by the formula: P=Hk/(lambdaxsigma) (where Hk represents the magnetic anisotropic field (A/m), sigma represents the stress (MPa) and lambda represents the magnetostriction constant) of larger than 0.1 and less than 200.