THIN-FILM MAGNETIC HEAD FOR MICROWAVE ASSIST AND MICROWAVE-ASSISTED MAGNETIC RECORDING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a thin-film magnetic head that can stably generate a high frequency electromagnetic field with a desired frequency, even under the existence of a significantly strong write field with frequently reversed direction.;SOLUTION: The head comprises first and second magnetic poles generating write fields and an electromagnetic-field generating element provided at a position reaching a medium facing surface between the first and second magnetic poles. The electromagnetic-field generating element comprises a spin-wave excitation layer provided adjacent to the first magnetic pole and having a magnetization with its direction varied according to external magnetic fields, for generating a high frequency electromagnetic field by excitation of a spin wave and a non-magnetic intermediate layer provided on the side opposite to the first pole of the spin-wave excitation layer. In the electromagnetic-field generating element, the magnetization of the spin-wave excitation layer is biased in a direction substantially perpendicular to its layer surface by a portion of the magnetic field generated from the first magnetic pole, and an electric current for exciting the spin-wave flows in the electromagnetic-field generating element in a direction from the second pole to the first pole.;COPYRIGHT: (C)2010,JPO&INPIT