The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 04, 2007
Filed:
Aug. 21, 2003
Koichi Osano, Osaka, JP;
Akinaga Natsui, Sakai, JP;
Shunsaku Muraoka, Hirakata, JP;
Noboru Itoh, Hirakata, JP;
Syouzou Ninomiya, Moriguchi, JP;
Kenji Hasegawa, Hirakata, JP;
Koichi Osano, Osaka, JP;
Akinaga Natsui, Sakai, JP;
Shunsaku Muraoka, Hirakata, JP;
Noboru Itoh, Hirakata, JP;
Syouzou Ninomiya, Moriguchi, JP;
Kenji Hasegawa, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
In a magnetic head, a multilayer film is disposed, the multilayer film including metal magnetic films and non-magnetic films that are alternately laminated, and a boundary between the multilayer film and a magnetic oxide substrate or a non-magnetic substrate on which the multilayer film is to be formed is parallel with a gap section at a surface of the magnetic head for sliding with respect to a magnetic recording medium. The metal magnetic films constituting the multilayer film have two or more types of thickness, or the metal magnetic films constituting the multilayer film have a uniform thickness, and the uniform thickness t satisfies t<v×cosθ/fmax, where v denotes a relative speed of the head to the recording medium, fmax denotes an upper limit of frequencies to be used and θ denotes an azimuth angle. With this configuration, a magnetic head having a suppressed pseudo signal and reduced noise can be provided, and a magnetic recording/reproducing device incorporating this magnetic head can be provided.