Magnetic head having an antistripping layer for preventing a magnetic layer from stripping

Abstract

By inserting a first antistripping layer comprising a first non-magnetic layer 22 and a first conductive layer 23 between a first magnetic layer 16 and a magnetic separation layer 13 , adhesion between the first conductive layer 23 and the magnetic separation layer 13 is improved to prevent the first magnetic layer 16 from stripping. In addition, by inserting a second antistripping layer comprising a second non-magnetic layer 24 and a second conductive layer 25 between a second magnetic layer 21 and a magnetic gap layer 17 , adhesion between the second conductive layer 24 and the magnetic gap layer 17 is improved to prevent the second magnetic layer 25 from stripping.

1 . A magnetic head comprising: 
 a substrate having a principal surface;    an antistripping layer formed on the principal surface of said substrate;    a first magnetic layer formed on said antistripping layer;    a recording gap layer formed on said first magnetic layer;    an insulating layer formed on said recording gap layer except for a pole tip region;    a write coil enclosed with and insulated by said insulating layer; and    a second magnetic layer formed on said insulating layer and on the pole tip region of said recording gap layer.    
   
   
       2 . A magnetic head as claimed in  claim 1 , wherein said antistripping layer comprises: 
 a non-magnetic layer formed on the principal surface of said substrate; and    a conductive layer formed on said non-magnetic layer, said first magnetic layer being formed on said conductive layer.    
   
   
       3 . A magnetic head as claimed in  claim 2 , wherein said non-magnetic layer comprises a lamina made of metal selected from the group consisting essentially of titanium (Ti), tantalum (Ta), chromium (Cr), yttrium (Y), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), molybdenum (Mo), and tungsten (W).  
   
   
       4 . A magnetic head as claimed in  claim 3 , wherein said lamina comprises one selected from a single-layer film, a multi-layer film, and an alloy film.  
   
   
       5 . A magnetic head as claimed in  claim 2 , wherein said non-magnetic layer is made of a non-magnetic material of titanium (Ti), said non-magnetic layer having a thickness between 2 nm and 10 nm, both inclusive.  
   
   
       6 . A magnetic head as claimed in  claim 2 , wherein said non-magnetic layer is made of a non-magnetic material of tantalum (Ta), said non-magnetic layer having a thickness between 1.5 nm and  10   m , both inclusive.  
   
   
       7 . A magnetic head as claimed in  claim 2 , wherein said non-magnetic layer is made of a non-magnetic material of chromium (Cr), said non-magnetic layer having a thickness between 2.5 nm and 10 nm, both inclusive.  
   
   
       8 . A magnetic head as claimed in  claim 2 , wherein said non-magnetic layer comprises a lamina made of metal having a tensile stress.  
   
   
       9 . A magnetic head as claimed in  claim 8 , wherein said lamina comprises one selected from a single-layer film, a multi-layer film, and an alloy film.  
   
   
       10 . A magnetic head as claimed in  claim 1 , wherein said first magnetic layers comprise a lamina selected from the group consisting essentially of cobalt-iron-nickel (CoFeNi), cobalt-iron-copper (CoFeCu), cobalt-iron-molybdenum (CoFeMo), cobalt-iron-boron (CoFeB), and cobalt-iron (CoFe).  
   
   
       11 . A magnetic head as claimed in  claim 10 , wherein said lamina comprises alloy.  
   
   
       12 . A magnetic head as claimed in  claim 10 , wherein said lamina comprises one selected from a single-layer film and a multi-layer film.  
   
   
       13 . A magnetic head as claimed in  claim 10 , wherein said lamina comprises a mixture.  
   
   
       14 . A magnetic head as claimed in  claim 13 , wherein said mixture further comprises an additional alloy consisting essentially of nickel-iron (NiFe).  
   
   
       15 . A magnetic head as claimed in  claim 1 , wherein said first magnetic layer comprises essential elements of cobalt (Co), nickel (Ni), and iron (Fe)  
   
   
       16 . A magnetic head as claimed in  claim 1 , wherein said first magnetic layer comprises a laminated structure of a first magnetic sub-layer comprising essential elements of cobalt (Co), nickel (Ni), and iron (Fe) and a second magnetic sub-layer comprising essential elements of nickel (Ni) and iron (Fe), said first magnetic sub-layer being disposed near to said recording gap layer.  
   
   
       17 . A magnetic head as claimed in  claim 15 , wherein said first magnetic layer has a crystal structure of a face-centered cubic (fcc) structure.  
   
   
       18 . A magnetic head as claimed in  claim 15 , wherein said first magnetic layer has a crystal structure of a body-centered cubic (bcc) structure.  
   
   
       19 . A magnetic head as claimed in  claim 15 , wherein said first magnetic layer has a crystal structure of a mixed crystal with a face-centered cubic (fcc) structure and a body-centered cubic (bcc) structure.  
   
   
       20 . A magnetic head as claimed in  claim 16 , wherein said first magnetic sub-layer has a crystal structure of a face-centered cubic (fcc) structure.  
   
   
       21 . A magnetic head as claimed in  claim 16 , wherein said first magnetic sub-layer has a crystal structure of a body-centered cubic (bcc) structure.  
   
   
       22 . A magnetic head as claimed in  claim 16 , wherein said first magnetic sub-layer has a crystal structure of a mixed crystal with a face-centered cubic (fcc) structure and a body-centered cubic (bcc) structure.  
   
   
       23 . A magnetic head as claimed in  claim 15 , wherein said first magnetic layer has a crystal particle diameter which is not more than 20 nm.  
   
   
       24 . A magnetic head as claimed in  claim 16 , wherein said first magnetic sub-layer has a crystal particle diameter which is not more than 20 nm.  
   
   
       25 . A magnetic head as claimed in  claim 1 , wherein a combination of said insulating layer and said write coil is made by successively laminating a first insulating layer, said write coil, and a second insulating layer on said recording gap layer, said second insulating layer having a periphery end on a side of an air bearing surface (ABS) that is close to said air bearing surface than a periphery end of said first insulating layer.  
   
   
       26 . A magnetic head as claimed in  claim 1 , wherein said substrate comprises: 
 an insulating substrate having a principal surface;    a first magnetic shield layer formed on the principal surface of said insulating substrate;    a magnetic separation layer formed on said first magnetic shield layer, said magnetic separation layer being made of an insulator; and    a magneto-resistive effective element sandwiched in said magnetic separation layer, said antistripping layer being formed on said magnetic separation layer, said first magnetic layer doubling as a second magnetic shield layer.    
   
   
       27 . A process for manufacturing a magnetic head as claimed in  claim 1 , wherein said first magnetic layers is made by electroplating.  
   
   
       28 . A process for manufacturing a magnetic head as claimed in  claim 15 , wherein said first magnetic layer is made by electroplating.  
   
   
       29 . A process for manufacturing a magnetic head as claimed in  claim 16 , wherein said first magnetic sub-layer is made by electroplating.  
   
   
       30 . A process for manufacturing a magnetic head as claimed in  claim 15 , wherein said first magnetic layer is made by electroplating with a plating bath including no stress relieving agent.  
   
   
       31 . A process for manufacturing a magnetic head as claimed in  claim 16 , wherein said first magnetic sub-layer is made by electroplating with a plating bath including no stress relieving agent.  
   
   
       32 . A magnetic storage unit comprising a magnetic head as claimed in  claim 1  and a magnetic recording medium which has a coercive force of 278600 A/m or more and which has a recording density of 10 gigabits/inch 2  or more.  
   
   
       33 . A magnetic storage unit comprising a magnetic head as claimed in  claim 2  and a magnetic recording medium which has a coercive force of 278600 A/m or more and which has a recording density of 10 gigabits/inch 2  or more.  
   
   
       34 . A magnetic storage unit comprising a magnetic head as claimed in  claim 15  and a magnetic recording medium which has a coercive force of 278600 A/m or more and which has a recording density of 10 gigabits/inch 2  or more.  
   
   
       35 . A magnetic storage unit comprising a magnetic head as claimed in  claim 25  and a magnetic recording medium which has a coercive force of 278600 A/m or more and which has a recording density of 10 gigabits/inch 2  or more.  
   
   
       36 . A magnetic storage unit comprising a magnetic head as claimed in  claim 26  and a magnetic recording medium which has a coercive force of 278600 A/m or more and which has a recording density of 10 gigabits/inch 2  or more.  
   
   
       37 - 62 . (canceled)  
   
   
       63 . A process for manufacturing a magnetic head, the magnetic head comprising: 
 a substrate having a principal surface;    a first magnetic layer formed on said substrate;    a recording gap layer formed on said first magnetic layer;    an insulating layer formed on said recording gap layer except for a pole tip region;    a write coil enclosed with and insulated by said insulating layer;    an antistripping layer formed on said insulating layer and on the pole tip region of said recording zap layer; and    a second magnetic layer formed on said antistripping layer;    wherein said second magnetic layer is made by electroplating.    
   
   
       64 . A process for manufacturing a magnetic head, the magnetic head comprising: 
 a substrate having a principal surface;    a first magnetic layer formed on said substrate;    a recording gap layer formed on said first magnetic layer;    an insulating layer formed on said recording gap layer except for a pole tip region;    a write coil enclosed with and insulated by said insulating layer;    an antistripping layer formed on said insulating layer and on the pole tip region of said recording gap layer; and    a second magnetic layer formed on said antistripping layer;    wherein said magnetic layer comprises essential elements of cobalt (Co), nickel (Ni) and iron (Fe); and    wherein said second magnetic layer is made by electroplating.    
   
   
       65 . A process for manufacturing a magnetic head, the magnetic head comprising: 
 a substrate having a principal surface;    a first magnetic layer formed on said substrate;    a recording gap layer formed on said first magnetic layer;    an insulating layer formed on said recording gap layer except for a pole tip region;    a write coil enclosed with and insulated by said insulating layer;    an antistripping layer formed on said insulating layer and on the pole tip region of said recording gap layer; and    a second magnetic layer formed on said antistripping layer;    wherein said second magnetic layer comprises a laminated structure of a first magnetic sub-layer comprising essential elements of cobalt (Co), nickel (Ni), and iron (Fe) and a second magnetic sublayer comprising essential elements of nickel (Ni) and iron (Fe), said first magnetic sub-layer being disposed near to said recording gap layer; and    wherein said first magnetic sub-layer is made by electroplating.    
   
   
       66 . A process for manufacturing a magnetic head, the magnetic head comprising: 
 a substrate having a principal surface;    a first magnetic layer formed on said substrate;    a recording gap layer formed on said first magnetic layer;    an insulating layer formed on said recording gap layer except for a pole tip region;    a write coil enclosed with and insulated by said insulating layer;    an antistripping layer formed on said insulating layer and on the pole tip region of said recording gap layer; and    a second magnetic layer formed on said antistripping layer;    wherein said wherein said magnetic layer comprises essential elements of cobalt (Co), nickel (Ni), and iron (Fe); and    wherein said second magnetic layer is made by electroplating with a plating bath including no stress relieving agent.    
   
   
       67 . A process for manufacturing a magnetic head, the magnetic head comprising 
 a substrate having a principal surface;    a first magnetic layer formed on said substrate;    a recording gap layer formed on said first magnetic layer;    an insulating layer formed on said recording gap layer except for a pole tip region;    a write coil enclosed with and insulated by said insulating layer;    an antistripping layer formed on said insulating layer and on the pole tip region of said recording gap layer; and    a second magnetic layer formed on said antistripping layer;    wherein said second magnetic layer comprises a laminated structure of a first magnetic sub-layer comprising a laminated structure of a first magnetic sub-layer comprising essential elements of cobalt (Co), nickel (Ni), and iron (Fe), and a second magnetic sub-layer comprising essential elements of nickel (Ni) and iron (Fe), said first magnetic sub-layer being disposed near to said recording gap layer; and    wherein said first magnetic sub-layer is made by electroplating with a plating bath including no stress relieving agent.    
   
   
       68 .- 98 . (canceled)  
   
   
       99 . A process for manufacturing a magnetic head, the magnetic head comprising: 
 a substrate having a principal surface;    a first antistripping layer formed on the principal surface of said substrate;    a first magnetic layer formed on said first antistripping layer;    a recording gap layer formed on said first magnetic layer;    an insulating layer formed on said recording gap layer except for a pole tip region;    a write coil enclosed with and insulated by said insulating layer;    a second antistripping layer formed on said insulating layer and on the pole tip region of said recording gap layer:    and a second magnetic layer formed on said second antistripping layer:    wherein each of said first and said second magnetic layers is made by electroplating.    
   
   
       100 . A process for manufacturing a magnetic head, the magnetic head comprising: 
 a substrate having a principal surface;    a first antistripping layer formed on the principal surface of said substrate;    a first magnetic layer formed on said first antistripping layer;    a recording gap layer formed on said first magnetic layer;    an insulating layer formed on said recording gap layer except for a pole tip region;    a write coil enclosed with and insulated by said insulating layer;    a second antistripping layer formed on said insulating layer and on the pole tip region of said recording gap layer;    and a second magnetic layer formed on said second antistripping layer,    wherein each of said first and said second magnetic layers comprises essential elements of cobalt (CO), nickel (Ni), and iron (Fe), and    wherein each of said first and said second magnetic layers is made by electroplating.    
   
   
       101 . A process for manufacturing a magnetic head, the magnetic head comprising: 
 a substrate having a principal surface;    a first antistripping layer formed on the principal surface of said substrate    a first magnetic layer formed on said first antistripping layer;    a recording gap layer formed on said first magnetic layer;    an insulating layer formed on said recording gap layer except for a pole tip region;    a write coil enclosed with and insulated by said insulating layer;    a second antistripping layer formed on said insulating layer and on the pole tip region of said recording gap layer; and    a second magnetic layer formed on said second antistripping layer,    wherein each of said first and said second magnetic layers comprises a laminated structure of a first magnetic sub-layer comprising essential elements of cobalt (Co), nickel (Ni), and iron (Fe) and a second magnetic sub-layer comprising essential elements of nickel (Ni) and iron (Fe), said first magnetic sub-layer being disposed near to said recording gap layer, and    wherein said first magnetic sub-layer is made by electroplating.    
   
   
       102 . A process for manufacturing a magnetic head, the magnetic head comprising: 
 a substrate having a principal surface;    a first antistripping layer formed on the principal surface of said substrate;    a first magnetic layer formed on said first antistripping layer;    a recording gap layer formed on said first magnetic layer;    an insulating layer formed on said recording gap layer except for a pole tip region;    a write coil enclosed with and insulated by said insulating layer;    a second antistripping layer formed on said insulating layer and on the pole tip region of said recording gap layer; and    a second magnetic layer formed on said second antistripping layer,    wherein each of said first and said second magnetic layers comprises essential elements of cobalt (Co), nickel (Ni), and iron (Fe), and    wherein each of said first and said second magnetic layers is made by electroplating with a plating bath including no stress relieving agent.    
   
   
       103 . A process for manufacturing a magnetic head, the magnetic head comprising: 
 a substrate having a principal surface;    a first antistripping layer formed on the principal surface of said substrate;    a first magnetic layer formed on said first antistripping layer;    a recording gap layer formed on said first magnetic layer;    an insulating layer formed on said recording gap layer except for a pole tip region;    a write coil enclosed with and insulated by said insulating layer;    a second antistripping layer formed on said insulating layer and on the pole tip region of said recording gap layer; and    a second magnetic layer formed on said second antistripping layer,    wherein each of said first and said second magnetic layers comprises a laminated structure of a first magnetic sub-layer comprising essential elements of cobalt (Co), nickel (Ni), and iron (Fe) and a second magnetic sub-layer comprising essential elements of nickel (Ni) and iron (Fe), said first magnetic sub-layer being disposed near to said recording gap layer, and    wherein said first magnetic sub-layer is made by electroplating with a plating bath including no stress relieving agent.    
   
   
       104 - 108 . (canceled)