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:
Sep. 11, 2012
Filed:
Mar. 11, 2011
Tsutomu Aoyama, Tokyo, JP;
Tetsuya Roppongi, Tokyo, JP;
Yoshikazu Soeno, Tokyo, JP;
Kiyoshi Noguchi, Tokyo, JP;
Isamu Sato, Tokyo, JP;
Tsutomu Aoyama, Tokyo, JP;
Tetsuya Roppongi, Tokyo, JP;
Yoshikazu Soeno, Tokyo, JP;
Kiyoshi Noguchi, Tokyo, JP;
Isamu Sato, Tokyo, JP;
TDK Corporation, Tokyo, JP;
Abstract
A microwave assisted magnetic head of the present invention includes: at least two or more auxiliary coils that are arranged in a periphery of a writing main pole; and microwave current supply means that applies microwave currents to the at least two or more auxiliary coils. The at least two or more auxiliary coils respectively include linear body parts linearly arranged on an ABS side, two of the linear body parts of the at least two or more auxiliary coils are arranged in a substantially orthogonal positional relationship, and the microwave current supply means is configured such that the microwave current supply means changes phase differences of the microwave currents applied respectively to the at least two or more auxiliary coils. Therefore, the microwave current can be easily controlled, and thus, a circularly polarized magnetic field with high magnetization inversion efficiency can be generated as an assistance magnetic field.