Low inductance, ferrite sub-gap substrate structure for surface film magnetic recording heads

Abstract

A thin film magnetic recording head is fabricated by forming a substrate from opposing ferrite blocks which have a ceramic member bonded between them. This structure is then diced to form a plurality of columns, wherein each column has a ferrite/ceramic combination. Each column represents a single channel in the completed head. A block of ceramic is then cut to match the columned structure and the two are bonded together. The bonded structure is then cut or ground until a head is formed, having ceramic disposed between each channel. A ferrite back-gap is then added to each channel, minimizing the reluctance of the flux path. The thin film is patterned on the head to optimize various channel configurations.

1 - 51 . (canceled)  
   
   
       52 . Magnetic media formed by writing the media with a multi-channel surface film magnetic recording head, the recording head comprising: 
 a plurality of magnetically permeable columns, each column being divided into two parts by a substantially magnetically impermeable gap member, the gap member forming a sub-gap on a writing side of the head;    at least one magnetically impermeable barrier, located between and magnetically isolating the plurality of magnetically permeable columns from one another; and    a magnetically permeable thin film layer spanning at least a portion of the sub-gap and magnetically coupling the two parts of each column, wherein the thin film layer includes writing gaps defining a pattern.    
   
   
       53 . The magnetic media of  claim 52 , wherein the recording head further comprises: 
 a plurality of magnetically permeable back-bars, wherein each magnetically permeable column has a back-bar coupled to it and the back-bar bypasses the magnetically impermeable gap member at one end of the magnetically permeable column.    
   
   
       54 . The magnetic media of  claim 52 , wherein the thin film layer has been removed in portions so as to magnetically isolate each of the magnetically permeable columns.  
   
   
       55 . Magnetic media formed by writing the media with a surface film magnetic recording head having a pattern, the recording head comprising: 
 a magnetically permeable core;    a substantially magnetically impermeable member dividing the core into two poles and forming a sub-gap;    at least one magnetically impermeable barrier dividing the core and the impermeable member into a plurality of channels; and    a magnetically permeable thin film coupling the two poles across the sub-gap, wherein the thin film includes writing gaps forming the pattern.    
   
   
       56 . The magnetic media of  claim 55 , wherein a space between each channel is devoid of the thin film, the space extending over the entire length of the head.  
   
   
       57 . Magnetic media formed by writing the media with a multi-channel surface film amplitude-based magnetic recording head, the recording head comprising: 
 a plurality of magnetically permeable columns, each column being divided into two parts by a substantially magnetically impermeable gap member, the gap member forming a sub-gap on a writing side of the head;    at least one magnetically impermeable barrier, located between and magnetically isolating the plurality of magnetically permeable columns from one another; and    a magnetically permeable thin film layer spanning at least a portion of the sub-gap and magnetically coupling the two parts of each column, wherein the thin film layer includes writing gaps defining an amplitude-based pattern.    
   
   
       58 . The magnetic media of  claim 57 , wherein the thin film layer has been removed in portions so as to magnetically isolate each of the magnetically permeable columns.  
   
   
       59 . Magnetic media formed by writing the media with a surface film magnetic recording head having an amplitude-based pattern, the recording head comprising: 
 a magnetically permeable core;    a substantially magnetically impermeable member dividing the core into two poles and forming a sub-gap;    at least one magnetically impermeable barrier dividing the core and the impermeable member into a plurality of channels; and    a magnetically permeable thin film coupling the two poles across the sub-gap, wherein the thin film includes writing gaps forming an amplitude-based pattern.    
   
   
       60 . The magnetic media of  claim 59 , wherein a separate back-bar is provided for each channel.  
   
   
       61 . The magnetic media of  claim 59 , wherein each channel is magnetically isolated.  
   
   
       62 . The magnetic media of  claim 59  wherein a space between each channel is devoid of the thin film, the space extending over the entire length of the head.  
   
   
       63 . Magnetic media formed by writing the media with a thin film magnetic recording head, the recording head comprising: 
 a plurality of magnetically permeable columns, each column being divided into two parts by a substantially magnetically impermeable gap member, the gap member forming a sub-gap on a writing side of the head;    at least one magnetically impermeable barrier, located between and magnetically isolating the plurality of magnetically permeable columns from one another; and    a magnetically permeable thin film layer spanning at least a portion of the sub-gap and magnetically coupling the two parts of each column, wherein the thin film layer includes writing gaps defining a pattern.    
   
   
       64 . The magnetic media of  claim 63 , wherein the recording head further comprises: 
 a plurality of magnetically permeable back-bars, wherein each magnetically permeable column has a back-bar coupled to it and the back-bar bypasses the magnetically impermeable gap member at one end of the magnetically permeable column.    
   
   
       65 . The magnetic media of  claim 63 , wherein the thin film layer has been removed in portions so as to magnetically isolate each of the magnetically permeable columns.  
   
   
       66 . Magnetic media formed by writing the media with a thin film magnetic recording head having a pattern, the recording head comprising: 
 a magnetically permeable core;    a substantially magnetically impermeable member dividing the core into two poles and forming a sub-gap;    at least one magnetically impermeable barrier dividing the core and the impermeable member into a plurality of channels; and    a magnetically permeable thin film coupling the two poles across the sub-gap, wherein the thin film includes writing gaps forming the pattern.    
   
   
       67 . The magnetic media of  claim 66 , wherein a space between each channel is devoid of the thin film, the space extending over the entire length of the head.  
   
   
       68 . Magnetic media formed by writing the media with a thin film amplitude-based magnetic recording head, the recording head comprising: 
 a plurality of magnetically permeable columns, each column being divided into two parts by a substantially magnetically impermeable gap member, the gap member forming a sub-gap on a writing side of the head;    at least one magnetically impermeable barrier, located between and magnetically isolating the plurality of magnetically permeable columns from one another; and    a magnetically permeable thin film layer spanning at least a portion of the sub-gap and magnetically coupling the two parts of each column, wherein the thin film layer includes writing gaps defining an amplitude-based pattern.    
   
   
       69 . The magnetic media of  claim 68 , wherein the magnetically impermeable barrier is ceramic.  
   
   
       70 . The magnetic media of  claim 68 , wherein the thin film layer has been removed in portions so as to magnetically isolate each of the magnetically permeable columns.  
   
   
       71 . Magnetic media formed by writing the media with a thin film magnetic recording head having an amplitude-based pattern, the recording head comprising: 
 a magnetically permeable core;    a substantially magnetically impermeable member dividing the core into two poles and forming a sub-gap;    at least one magnetically impermeable barrier dividing the core and the impermeable member into a plurality of channels; and    a magnetically permeable thin film coupling the two poles across the sub-gap, wherein the thin film includes writing gaps forming an amplitude-based pattern.    
   
   
       72 . The magnetic media of  claim 71 , wherein a separate back-bar is provided for each channel.  
   
   
       73 . The magnetic media of  claim 71 , wherein each channel is magnetically isolated.  
   
   
       74 . The magnetic media of  claim 71 , wherein a space between each channel is devoid of the thin film, the space extending over the entire length of the head.