Microwave assisted magnetic recording head and microwave assisted magnetic recording apparatus having a magnetic flux rectifying layer with a magnetic flux rectifying action

摘要

With respect to microwave assisted magnetic recording, high-density information recording is performed by forming a favorable write magnetic domain on a recording medium. The recording medium is placed in a magnetically resonant state by generating a microwave, and information is recorded. A recording medium 7 comprises parts 17 and 18 with differing magnetic anisotropy fields. Recording is performed using, for the frequency of the microwave, a frequency that places the part 17, which has smaller magnetic anisotropy, in a resonant state. Recording density of an information recording apparatus can be increased, while at the same time also improving reliability. Consequently, it becomes possible to reduce costs.

主权项

1. An information recording apparatus comprising a magnetic recording medium, on which user data is to be stored, and a magnetic head, which comprises a write head part that performs a write operation with respect to the magnetic recording medium, wherein a magnetically resonant state is created with respect to the magnetic recording medium to perform the recording by applying to the magnetic recording medium a high-freguencv magnetic field and a write magnetic field that corresponds to the user data, wherein
the write head part comprises: a main pole that generates the write magnetic field; and an opposing pole provided in separation from the main pole on either a trailing side or leading side of the main pole, wherein the main pole comprises a protruding part on either a trailing side or a leading side of an end part on the air bearing surface side with respect to the magnetic recording medium, and the write head part further comprises, between the protruding part and the opposing pole: a spin rectifier; a magnetization rotation body layer whose magnetization direction is rotatable within a film plane; and, wherein the protruding part comprises a rectifying action with respect to magnetic flux that passes between the main pole and the opposing pole, wherein a material with equal as or greater than saturation magnetization of the main pole is used for the protruding part, wherein the rotation guide layer is a negative perpendicular magnetic anisotropy film whose magnetization direction is in a direction within the film plane.