Thermally-assisted magnetic recording head including plasmon generator

a technology of magnetic recording head and plasmon generator, which is applied in the field of thermally assisted magnetic recording head including, can solve the problems of increasing the coercivity of the magnetic recording medium, reducing the thermal stability of the magnetization of the magnetic fine particles, and difficult to perform data writing with the existing magnetic recording head, etc., and achieves the effect of efficient us

Active Publication Date: 2011-11-24
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0017]It is an object of the present invention to provide a thermally-assisted magnetic recording head that allows efficient use of the light propagated through the core of the waveguide, allows generation of near-field light having a small spot diameter from the plasmon generator, and allows the position of occurrence of

Problems solved by technology

However, making the magnetic fine particles smaller causes the problem that the thermal stability of magnetization of the magnetic fine particles decreases with decreasing volume of the magnetic fine particles.
However, increasing the anisotropic energy of the magnetic fine particles leads to an increase in coercivity of the magnetic recording medium, and this makes it difficult to perform data writing with existing magnetic heads.
However, the plasmon antenna which generates near-field light by direct irradiation with light is known to exhibit very low efficiency of transformation of the applied light into near-field light.
This causes an end of the read head located in the medium facing surface to get farther from the magnetic recording medium, thereby causing the problem that a servo signal cannot be read during write operations.
Making the inclination angle smaller, however, gives rise to the problem t

Method used

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  • Thermally-assisted magnetic recording head including plasmon generator
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  • Thermally-assisted magnetic recording head including plasmon generator

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first embodiment

[0061]Preferred embodiments of the present invention will now be described in detail with reference to the drawings. First, reference is made to FIG. 8 to describe a magnetic disk drive that functions as a magnetic recording device according to a first embodiment of the invention. As shown in FIG. 8, the magnetic disk drive includes a plurality of magnetic disks 201 as a plurality of magnetic recording media, and a spindle motor 202 for rotating the plurality of magnetic disks 201. The magnetic disks 201 of the present embodiment are for use in perpendicular magnetic recording. Each magnetic disk 201 has such a structure that a soft magnetic backing layer, a middle layer, and a magnetic recording layer (perpendicular magnetization layer) are stacked in this order on a disk substrate.

[0062]The magnetic disk drive further includes an assembly carriage device 210 having a plurality of driving arms 211, and a plurality of head gimbal assemblies 212 attached to respective distal ends of ...

second embodiment

[0194]A second embodiment of the invention will now be described with reference to FIG. 25. FIG. 25 is a front view showing a part of the medium facing surface of the head unit of the thermally-assisted magnetic recording head according to the present embodiment. The thermally-assisted magnetic recording head according to the present embodiment has a plasmon generator 84 instead of the plasmon generator 34 of the first embodiment. Although not shown, the plasmon generator 84 has a V-shaped portion, a second portion, and a third portion, as does the plasmon generator 34 of the first embodiment. The outer surface of the plasmon generator 84 includes the front end face 344, as does the plasmon generator 34 of the first embodiment.

[0195]The thermally-assisted magnetic recording head according to the present embodiment has a magnetic pole 85 instead of the magnetic pole 35 of the first embodiment. The magnetic pole 85 includes a first layer 851, and a second layer 852 on the first layer ...

third embodiment

[0199]A third embodiment of the invention will now be described with reference to FIG. 26. FIG. 26 is a perspective view showing the core of the waveguide, the plasmon generator, and the magnetic pole of the thermally-assisted magnetic recording head according to the present embodiment. The thermally-assisted magnetic recording head according to the present embodiment has a plasmon generator 94 instead of the plasmon generator 34 of the first embodiment. The plasmon generator 94 has a V-shaped portion 94A having an end face located in the medium facing surface 12a. The V-shaped portion 94A extends in the direction perpendicular to the medium facing surface 12a (X direction). In the present embodiment, in particular, the entire plasmon generator 94 is composed of the V-shaped portion 94A. In the cross section parallel to the medium facing surface 12a, the V-shaped portion 94A has the same shape as that of the V-shaped portion 34A of the plasmon generator 34 of the first embodiment.

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Abstract

A plasmon generator has an outer surface including a plasmon exciting part that faces an evanescent light generating surface of a waveguide. The outer surface further includes first and second inclined surfaces that increase in distance from each other with increasing distance from the plasmon exciting part, and a front end face. The front end face has first and second portions that are connected to each other into a V-shape. The first portion includes a first side lying at an end of the first inclined surface. The second portion includes a second side lying at an end of the second inclined surface. An angle formed between a lower part of the first side and a lower part of the second side is smaller than that formed between an upper part of the first side and an upper part of the second side.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a thermally-assisted magnetic recording head including a plasmon generator for use in thermally-assisted magnetic recording where a magnetic recording medium is irradiated with near-field light to lower the coercivity of the magnetic recording medium for data writing.[0003]2. Description of the Related Art[0004]Recently, magnetic recording devices such as magnetic disk drives have been improved in recording density, and thin-film magnetic heads and magnetic recording media of improved performance have been demanded accordingly. Among the thin-film magnetic heads, a composite thin-film magnetic head has been used widely. The composite thin-film magnetic head has such a structure that a read head including a magnetoresistive element (hereinafter, also referred to as MR element) intended for reading and a write head including an induction-type electromagnetic transducer intended for writing...

Claims

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Application Information

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IPC IPC(8): G11B5/02G11B5/127
CPCB82Y20/00G02B5/008G02B6/1226G11B5/1278G11B5/3116Y10T29/49032G11B5/3163G11B5/6088G11B7/1384G11B7/1387G11B2005/0021G11B5/314
Inventor TSUTSUMI, TAKESHIMIYAUCHI, DAISUKEROPPONGI, TETSUYATANAKA, KOSUKEAOKI, SUSUMUIZAWA, TAKAHIKOCHOU, TSUTOMU
Owner TDK CORPARATION
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