Magnetic write head with structured trailing pole

Abstract

The invention is directed to a magnetic write head configured for writing to a magnetic medium, such as, a magnetic tape along a longitudinal direction x. The magnetic write head includes a trailing pole with a first face of height r 1 ; a leading pole with a second face, each of the first face and second face being arranged to face the magnetic medium in operation; and a magnetic gap of height g between the trailing pole and the leading pole. The height r 1 and the height g are such that r 1 ≦1.0 g and each of the height g and the height r 1 is measured parallel to said longitudinal direction x.

1 . A magnetic write head configured for writing to a magnetic medium along a longitudinal direction x, the magnetic write head comprising:
 a trailing pole with a first face of height r 1 ;   a leading pole with a second face, wherein each of the first face and the second face is arranged to face the magnetic medium, in operation; and   a magnetic gap of height g between the trailing pole and the leading pole, wherein the height r 1  and the height g are such that r 1 ≦1.0 g, and wherein each of the height g and the height r 1  are measured parallel to said longitudinal direction x.   
     
     
         2 . The magnetic write head of  claim 1 , wherein said height r 1  and said height g are such that 0.1 g<r 1 <1.0 g. 
     
     
         3 . The magnetic write head of  claim 1 , wherein the height r 1  is less than 300 nm. 
     
     
         4 . The magnetic write head of  claim 1 , wherein the height r 1  is less than 150 nm. 
     
     
         5 . The magnetic write head of  claim 1 , wherein said height r 1  is between 15 nm and 150 nm. 
     
     
         6 . The magnetic write head of  claim 1 , wherein the trailing pole comprises:
 a recessed portion having a third face arranged to face the magnetic medium, in operation; and   a non-recessed portion exhibiting said first face of height r 1 , wherein the third face is recessed with respect to the first face, opposite to the magnetic medium, in a direction z perpendicular to the magnetic medium.   
     
     
         7 . The magnetic write head of  claim 6 , wherein
 the third face is recessed a minimal distance t 2  with respect to said first face, in the direction z perpendicular to the magnetic medium; and   a surface of the third face is substantially larger than a surface of said first face.   
     
     
         8 . The magnetic write head of  claim 6 , wherein the trailing pole comprises a high-permeability magnetic material, the magnetic write head comprising a low-permeability material filling in a space delimited in part by the recessed portion and the non-recessed portion, such that the low-permeability material exhibits a fourth face facing the magnetic medium, in operation, said fourth face being flush with the first face and the second face. 
     
     
         9 . The magnetic write head of  claim 8 , wherein said minimal distance t 2  satisfies 0.25 r 1 <t 2 <10.00 r 1 . 
     
     
         10 . The magnetic write head of  claim 9 , wherein said minimal distance t 2  satisfies 0.50 r 1 <t 2 <2.00 r 1 . 
     
     
         11 . The magnetic write head of  claim 7 , wherein the third face is substantially not parallel to the first face. 
     
     
         12 . The magnetic write head of  claim 1 , wherein the leading pole further comprises a notch arranged to reduce a surface of the second face. 
     
     
         13 . The magnetic write head of  claim 12 , wherein the leading pole comprises two notches, each of said notches arranged to reduce the surface of the second face and exhibiting mirror symmetry. 
     
     
         14 . A magnetic write head configured for writing to a magnetic medium along a locally longitudinal direction x of the magnetic medium, the magnetic write head comprising:
 a trailing pole with a first face of height r 1 ;   a leading pole with a second face, wherein each of the first face and the second face is arranged to face the magnetic medium, in operation; and   a magnetic gap of height g between the trailing pole and the leading pole, wherein said height r 1 , measured parallel to said longitudinal direction x, is less than 300 nm.   
     
     
         15 . The magnetic write head of  claim 13 , wherein said height r 1 , measured parallel to said longitudinal direction x, is less than 150 nm. 
     
     
         16 . The magnetic write head of  claim 13 , wherein said height r 1 , measured parallel to said longitudinal direction x, is less between 20 nm and 150 nm. 
     
     
         17 . An apparatus comprising a magnetic write head configured for writing to a magnetic medium along a longitudinal direction x, the magnetic write head comprising:
 a trailing pole with a first face of height r 1 ;   a leading pole with a second face, wherein each of the first face and the second face is arranged to face the magnetic medium, in operation; and   a magnetic gap of height g between the trailing pole and the leading pole, wherein the height r 1  and the height g are such that r 1 ≦1.0 g, and wherein each of the height g and the height r 1  are measured parallel to said longitudinal direction x.   
     
     
         18 . A method of writing a magnetic medium, comprising:
 providing a magnetic medium;   providing an apparatus comprising a magnetic write head configured for writing to a magnetic medium along a longitudinal direction x; and   writing the magnetic medium via the apparatus;   wherein the magnetic write head comprises:
 a trailing pole with a first face of height r 1 ; 
 a leading pole with a second face, wherein each of the first face and the second face is arranged to face the magnetic medium, in operation; and 
 a magnetic gap of height g between the trailing pole and the leading pole; 
 wherein the height r 1  and the height g are such that r 1 ≦1.0 g, and wherein each of the height g and the height r 1  are measured parallel to said longitudinal direction x. 
   
     
     
         19 . A non-transitory computer readable article of manufacture tangibly embodying computer readable instructions which, when executed, cause a computer to carry out the steps of a method for writing a magnetic medium according to  claim 18 .