Magnetic head with integrated write driver

Abstract

An apparatus comprises a slider body, a transducer and a write driver. The transducer comprises a writer. The write driver is integrated on the slider body, and directly connected to the writer.

1 . An apparatus comprising:
 a slider body;   a transducer on the slider body, the transducer comprising a writer;   a write driver integrated on the slider body, wherein the write driver is directly connected to the writer.   
     
     
         2 . The apparatus of  claim 1 , wherein the write driver is attached to an external surface of the slider body. 
     
     
         3 . The apparatus of  claim 1 , wherein the write driver is positioned in the transducer. 
     
     
         4 . The apparatus of  claim 3 , further comprising a transducer substrate and wherein the write driver is between the transducer substrate and the writer. 
     
     
         5 . The apparatus of  claim 3 , further comprising a transducer substrate and wherein the writer is between the transducer substrate and the write driver. 
     
     
         6 . The apparatus of  claim 1 , wherein the write driver comprises a current source and an impedance matching element. 
     
     
         7 . The apparatus of  claim 1 , wherein a write data input provides a data signal to the write driver. 
     
     
         8 . An apparatus comprising:
 a slider body;   a writer formed on the slider body, the writer comprising a write pole and a write coil;   a write driver formed on a substrate and integrated on the slider body, the write driver comprising a current source for generating a write current; and   an impedance-matching element connected between the current source and the write coil, such that the impedance-matching element matches impedance between the write driver and the writer.   
     
     
         9 . The apparatus of  claim 8 , wherein the substrate is attached to an external surface of the slider body. 
     
     
         10 . The apparatus of  claim 8 , wherein the substrate is located within a transducer on the slider body. 
     
     
         11 . The apparatus of  claim 8 , wherein the impedance-matching element comprises a resistive element for reducing reflections by matching a resistive impedance of the writer, such that the current source generates a write current of about 100 mA or more with a launch voltage of about 750 mV or less. 
     
     
         12 . The apparatus of  claim 8 , wherein the impedance-matching element comprises a reactive element for increasing power transfer by complex conjugate matching a reactive impedance of the writer, such that the current source generates a write current of about 100 mA or more with a power dissipation of about 100 mW or less. 
     
     
         13 . The apparatus of  claim 8 , wherein the write driver comprises a high-impedance data input for delivering write signals to the write driver and the impedance-matching element matches impedance across the high impedance data input. 
     
     
         14 . The apparatus of  claim 8 , wherein the write driver comprises a single-ended power input for delivering power to the current source and a bypass capacitor for buffering the single-ended power input. 
     
     
         15 . The apparatus of  claim 8 , wherein the write driver comprises a control input for scaling or shaping the write current in the write coil. 
     
     
         16 . The apparatus of  claim 8 , wherein the current source is formed of a non-silicon based semiconductor material having a minimum electron mobility of about five thousand centimeters squared per volt-second. 
     
     
         17 . The apparatus of  claim 8 , further comprising a bond pad or adhesive layer for bonding the substrate to an exposed surface of the slider body. 
     
     
         18 . A method comprising:
 forming a magnetic writer on a slider body;   forming a write driver on a substrate;   integrating the write driver and the substrate with the slider body; and   connecting an impedance-matching element between the write driver and the writer, such that the write driver drives a write current through the magnetic writer and the impedance-matching element matches impedance between the write driver and the writer.   
     
     
         19 . The method of  claim 18 , wherein connecting an impedance-matching element comprises connecting a reactive element between the write driver and the writer, such that the reactive element matches a complex conjugate of an impedance of the writer. 
     
     
         20 . The method of  claim 18 , wherein forming the write driver on the substrate comprises forming a non-silicon based write driver on a non-silicon based substrate.