Magnetic head structure with enlarged insulating layer

Abstract

A magnetic head structure has a coil and a magnetic pole allowing a magnetic flux generated by the coil to be transmitted therethrough and forming a magnetic gap. An insulating layer surrounds the coil, and a protective layer covers the insulating layer and the magnetic pole. The insulating layer has a volume equal to or greater than a value which is determined with respect to a thickness of the protective layer. It is preferable to increase the volume of the insulating layer as the thickness of the protective layer is made greater. By increasing the volume of the insulating layer, the protrusion of a portion of a floating surface of the magnetic head slider near the magnetic pole, toward the disk, is reduced.

1 . A magnetic head structure comprising: 
 a coil;    a magnetic pole allowing a magnetic flux generated by the coil to be transmitted therethrough and forming a magnetic gap;    an insulating layer surrounding the coil;    a protective layer covering the insulating layer and the magnetic pole; and    a material layer arranged in or on the protective layer and having coefficient of thermal expansion smaller than that of the protective layer.    
   
   
       2 . The magnetic head structure according to  claim 1 , wherein the material layer having coefficient of thermal expansion smaller than that of the protective layer is arranged on the protective layer.  
   
   
       3 . The magnetic head structure according to  claim 1 , wherein the material layer having coefficient of thermal expansion smaller than that of the protective layer is arranged in the protective layer.  
   
   
       4 . The magnetic head structure according to  claim 1 , wherein the material layer having coefficient of thermal expansion smaller than that of the protective layer is arranged between the magnetic pole and a shield.  
   
   
       5 . The magnetic head structure according to  claim 1 , wherein the material layers having coefficient of thermal expansion smaller than that of the protective layer are arranged on the protective layer, in the protective layer and between the magnetic pole and a shield.  
   
   
       6 . The magnetic head structure according to  claim 1 , wherein: 
 the material layer is situated between a substrate and a shield.