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:
Oct. 22, 2002
Filed:
Apr. 24, 1998
Yoji Maruyama, Iruma, JP;
Yoshio Suzuki, Suginami-ku, JP;
Ryoichi Nakatani, Akiruno, JP;
Hisashi Takano, Kodaira, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
It is the object of the invention to provide a magnetic head and a magnetic storage apparatus using the magnetic head provided with a signal reproducing means which is capable of using the same signal processing circuit as used for the conventional longitudinal magnetization film type recording medium even when a perpendicular magnetization film type recording medium is used. Because the present invention renders the reproducing signal generated from a perpendicular magnetization film Gaussian shaped (Lorentzian pulse), the same signal processing circuit as used for the conventional longitudinal magnetization film type recording medium can be used. To accomplish this object, in the reproducing means which is the component of the information reproducing component of the magnetic head, the first spin valve element and the second valve element are piled up, the magnetization direction of pinned layers of both elements is prescribed so as to be antiparallel each other, and lead electrodes of both elements are connected so as to be common. When two spin valve elements are piled up to compose a reproducing means, the first spin valve element is structured so as to have an Ru film between the first ferromagnetic film and the second ferromagnetic film and so as to have a Cu film between the second ferromagnetic film and the third ferromagnetic film, and the second spin valve element is structured so as to have a Cu film between the fourth ferromagnetic film and the fifth ferromagnetic film. These two elements are piled up with interposition of a desired spacer film adjacently.