Perpendicular Recording Head Having Controlled Permeability and Saturation Moment

Abstract

A method and apparatus having magnetic properties. The apparatus includes a main pole and a return pole spaced apart from the main pole. The return includes at least one multilayer block having a plurality of alternating layers of magnetic material and non-magnetic material. The return pole also includes a single magnetic material layer coupled to the at least one multilayer block. The magnetic material layer has a permeability that is greater than a permeability of the at least one multilayer block.

1 - 14 . (canceled) 
     
     
         15 . A transducer comprising:
 a main pole having a leading edge and a trailing edge;   a first return pole spaced apart from the leading edge of the main pole and a second return pole spaced apart from the trailing edge of the main pole, wherein each of the first return pole and the second return pole comprise:
 a plurality of alternating layers of magnetic and non-magnetic material that includes at least one non-magnetic material layer positioned between first and second magnetic material layers; and 
 a third magnetic material layer coupled to the plurality of alternating layers, wherein the third magnetic material layer has a permeability greater than the permeability of the plurality of alternating layers. 
   
     
     
         16 . The transducer of  claim 15 , wherein the third magnetic material layer in each of the first return pole and the second return pole is positioned further from the main pole than the plurality of alternating layers. 
     
     
         17 . The transducer of  claim 15 , wherein a combined thickness of the plurality of alternating layers of magnetic and non-magnetic material do not exceed a distance between the transducer and a storage medium. 
     
     
         18 . The transducer of  claim 15 , wherein each magnetic material layer of the plurality of alternating layers that is located closest to the third magnetic material layer has a greater thickness than each magnetic material layer that is further from the third magnetic material layer. 
     
     
         19 . The transducer of  claim 15 , wherein the third magnetic material layer comprises a plurality of different magnetic materials, wherein the magnetic material of the third magnetic material layer that is furthest from the main pole has a greater permeability than the magnetic material that is closer to the main pole. 
     
     
         20 . The transducer of  claim 15 , wherein the main pole is configured to conduct a magnetic flux away from the transducer. 
     
     
         21 . The transducer of  claim 20 , wherein the first return pole is configured to conductively return a portion of the magnetic flux to the transducer. 
     
     
         22 . The transducer of  claim 21 , wherein the second return pole is configured to conductively return a remaining portion of the magnetic flux to the transducer. 
     
     
         23 . A device having magnetic properties comprising:
 a main pole configured to conduct a magnetic flux away from the device;   a first return pole spaced apart from the main pole and configured to conductively return a portion of the magnetic flux to the device and a second return pole spaced apart from the main pole and configured to conductively return a remaining portion of the magnetic flux to the device, each of the first return pole and the second return pole comprising:
 at least one multilayer block having a plurality of alternating layers of magnetic material and non-magnetic material, wherein each multilayer block includes at least one non-magnetic layer positioned between first and second magnetic material layers; 
 a third magnetic material layer coupled to the at least one multilayer block, wherein the third magnetic material layer has a permeability that is greater than a permeability of the at least one multilayer block; 
   
     
     
         24 . The device of  claim 23 , wherein the third magnetic material layer in each of the first return pole and the second return pole is positioned further from the main pole than the at least one multilayer block. 
     
     
         25 . The device of  claim 23 , wherein the first return pole is spaced apart from a leading edge of the main pole and the second return pole is spaced apart from a trailing edge of the main pole. 
     
     
         26 . The device of  claim 25 , wherein the third magnetic material layer in the first return pole is positioned further from the leading edge of the main pole than the at least one multilayer block. 
     
     
         27 . The device of  claim 25 , wherein the third magnetic material layer in the second return pole is positioned further from the trailing edge of the main pole than the at least one multilayer block. 
     
     
         28 . The device of  claim 23 , wherein each multilayer block of the first return pole and the second return pole comprises a thickness that is less than a distance between the device and a storage medium. 
     
     
         29 . The device of  claim 23 , wherein the layers of magnetic material in each multilayer block comprise a thickness greater than the layers of non-magnetic material in each multilayer block. 
     
     
         30 . The device of  claim 23 , wherein each multilayer block that is located closer to the third magnetic material layer has a greater permeability than each multilayer block that is located further from the third magnetic material layer. 
     
     
         31 . A transducer comprising:
 a first element comprising:
 a first magnetic material layer; 
 at least one multilayer block coupled to the first magnetic material layer, each multilayer block having a plurality of alternating layers of magnetic material and non-magnetic material that includes at least one non-magnetic material positioned between second and third magnetic material layers; 
 wherein the first magnetic material layer has a permeability that is greater than the at least one multilayer block; 
   a second element spaced apart from the first element by a first gap, wherein the at least one multilayer block of the first element are positioned in closer proximity to the gap than the first magnetic material layer of the first element; and   a third element spaced apart from the second element by a second gap, the third element comprising:
 a first magnetic material layer; 
 at least one multilayer block coupled to the first magnetic material layer, each multilayer block having a plurality of alternating layers of magnetic material and non-magnetic material that includes at least one non-magnetic material layer positioned between second and third magnetic material layers; and 
 wherein the first magnetic material layer has a permeability that is greater than the at least one multilayer block. 
   
     
     
         32 . The transducer of  claim 31 , wherein the second element is configured to conduct a magnetic flux away from the transducer, the first element is configured to conductively return a portion of the magnetic flux to the transducer and the third element is configured to conductively return a remaining portion of the magnetic flux to the transducer. 
     
     
         33 . The transducer of  claim 31 , wherein each multilayer block that is located closer to the first magnetic material layer of the first element and the third element have a greater permeability than each of multilayer block that is located further from the first magnetic material layer of the first element and the third element. 
     
     
         34 . The transducer of  claim 31 , wherein the at least one multilayer block in each of the first element and the second element comprises a plurality of mutually attached multilayer blocks coupled to the first magnetic material layer of each of the first element and the second element.