Thermally assisted magnetic recording head and method of manufacturing the same

Abstract

In order to prevent deterioration of floating characteristics of a slider due to deformation of a slider floating surface by thermal expansion of a coil, the followings are performed. A recessed portion is formed in a part of the slider, and a device for generating an optical near-field and the coil for generating a magnetic field are formed in the recessed portion. The optical near-field generation device is formed on a surface facing a recording medium, and the magnetic field application coil is formed on an upper surface of the recessed portion. The optical near-field generation device and the magnetic field application coil are respectively exposed to the surface.

1 . A head used for a thermally assisted magnetic recording apparatus for recording data on a data recording medium by applying a magnetic field and an optical near-field thereto, wherein 
 said head comprises a substrate with a recessed portion formed therein; and an optical near-field generation device and a magnetic field generation device are formed in the recessed portion.    
   
   
       2 . The head according to  claim 1 , wherein the optical-near field generation device is exposed to the surface facing the data recording medium in the recessed portion.  
   
   
       3 . The head according to  claim 2 , wherein the magnetic field generation device is exposed to the opposite side surface of the side where the optical-near field generation device in the recessed part is provided.  
   
   
       4 . The head according to  claim 1 , wherein the magnetic field generation device is a coil, and the optical-near field generation device is provided in the inside of the coil.  
   
   
       5 . The head according to  claim 4 , wherein a magnetic pole made of a soft magnetic body is arranged in the inside of the coil.  
   
   
       6 . The head according to  claim 1 , wherein the bottom part of the recessed portion transmits a light.  
   
   
       7 . The head according to  claim 1 , wherein the substrate is composed of a plurality of layers of different materials, and the bottom part of the recessed portion is composed of one layer among the plurality of material layers.  
   
   
       8 . The head according to  claim 1 , wherein a film whose thermal conductivity is higher than that of the substrate is formed on the opposite side surface of the side facing the data recording medium in the recessed portion.  
   
   
       9 . A manufacturing method of a head for use in a thermally assisted magnetic recording apparatus for recording data on a data recording medium by applying a magnetic field and an optical near-field, comprising the steps of: 
 forming a recessed portion on one side of a substrate;    forming an optical near-field generation device in the position corresponding to the recessed portion on the other surface of the substrate; and    forming a magnetic field generation device on the bottom part of the recessed portion of the substrate.    
   
   
       10 . The manufacturing method of the head according to  claim 9 , wherein the magnetic field generation device is a coil, and said method including a step of positioning so that the optical near-field generation device is positioned in the central part of the coil.