Heat-assisted magnetic recording head and heat-assisted magnetic recording disk drive

Abstract

The invention relates to a heat-assisted magnetic recording head and a heat-assisted magnetic recording disk drive. The heat-assisted magnetic recording head comprises a sliding block main body, a laser substrate, a laser and a magnetic head, wherein the laser substrate is arranged on the sliding block main body, the laser device is arranged on the laser substrate, the magnetic head is arranged atthe front end of the sliding block main body, the magnetic head comprises an optical waveguide directly facing the laser device, and the included angle between the incident surface of the optical waveguide and the incident direction of laser incident to the optical waveguide is smaller than 90 degrees; the disk drive comprises a plurality of disks and a head suspension, wherein the heat-assistedmagnetic recording head is arranged at the front end of the head suspension. In the heat-assisted magnetic recording head, the included angle between the incident surface of the optical waveguide andthe incident direction is smaller than 90 degrees, so that the reflected light of the incident surface cannot return to the laser along the incident direction, the laser emission instability can be improved, and the mode hopping can be inhibited.

Description

technical field [0001] The present invention relates to disk drive technology, more specifically, to a heat-assisted magnetic recording head and a heat-assisted magnetic recording disk drive. Background technique [0002] In order to increase the magnetic recording density, the previous method is to reduce the grain size as much as possible, but with the continuous increase of the storage density, it is found that the reduction of the grain volume is limited by the superparamagnetic effect. The relaxation time of the magnetic order decreases exponentially when the size of the recording spot decreases; when the measurement temperature of the recording spot increases, the relaxation time of the magnetic order also decreases exponentially. Therefore, both the reduction of the volume of the recording point and the increase of the temperature will lead to the magnetic instability of the recording point. [0003] In order to break through the limit of magnetic recording density c...

AI Technical Summary

Problems solved by technology

see figure 1 and 2 , the existing heat-assisted magnetic recording head comprises a slider body 1, a laser substrate 2 arranged on the slider body 1 and a laser 3 arranged on the laser substrate 2, a magnetic head 4 is arranged at the front end of the slider body 1, and the magnetic head 4 includes an optical waveguide 40, the light incident surface 41 of the optical waveguide 40 is facing the laser 3, and the light incident surface 41 is a plane, that is, the light incident surface 41 is perpendicular to the incident direction of the laser light emitted by the laser 3, which will cause the laser 3 to emit Part of the laser light is reflected back along the original path, resulting in unstable laser emission and mode hopping of the laser 3. These undesirable effects will lead to a large increase in the error rate of the heat-assisted magnetic recording head, making it difficult to achieve the purpose of high-density recording

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