MAGNETIC RECORDING METHOD

PROBLEM TO BE SOLVED: To provide a magnetic recording method by which magnetic recording being able to perform high density recording is achieved by solving a problem of switching of polarity of circular polarization, a problem of magnitude of amplitude of alternative magnetic field, and a problem of variance of a resonance frequency of a recording medium which are problems when microwave-assist-recording is performed. SOLUTION: Switching of polarity when circular polarization is used is not required by making an alternating magnetic field used for microwave-assist-magnetic-recording have linear polarization. Further, a magnetization reversal magnetic field can be reduced remarkably by performing frequency modulation of an alternating magnetic field with a modulation amplitude ratio within a range of 0.5 to 50% of a basic frequency of alternating magnetic field and a modulation period ratio of 2 to 20 or less for a basic period of alternating magnetic field; consequently, amplitude of required alternating magnetic field can be reduced remarkably. Also, microwave-assist-recording can be performed stably even in a state in which variance of resonance frequencies of the recording media exists. COPYRIGHT: (C)2010,JPO&INPIT