Texturing of magnetic disk substrates

Abstract

A method for texturing a substrate for a magnetic disk comprises abrading the substrate using nano-sized diamond particles (e.g. having a diameter less than or equal to 20 nm). A magnetic layer is then deposited over the substrate. Even when the texture is extremely smooth (e.g. less than about 2.2 Å Ra), the disk still exhibits good Hc and MrT orientation ratios, SNR and PW50.

1 - 28 . (canceled)  
   
   
       29 . A method comprising texturing a substrate with particles having a size less than or equal to about 20 nm to texture said substrate, said texturing resulting in a Ra of said substrate less than 2.2 Å.  
   
   
       30 . Method of  claim 29  wherein said particles comprise diamond.  
   
   
       31 . Method of  claim 29  further comprising forming a magnetic layer above said substrate.  
   
   
       32 . Method of  claim 31  further comprising forming one or more intermediate layers between said substrate and said magnetic layer.  
   
   
       33 . Method of  claim 32  wherein said abrasive particles have a diameter greater than or equal to 2 nm.  
   
   
       34 . Method of  claim 32  wherein said texture causes said magnetic layer to exhibit anisotropic magnetic characteristics.  
   
   
       35 . Method of  claim 32  further comprising mounting said substrate with said magnetic layer formed thereon in a disk drive.  
   
   
       36 . A method comprising texturing a magnetic data storage medium substrate with particles being sufficiently small to form a texture Ra less than 2.2 Å while inducing magnetic anisotropy in a magnetic layer deposited over said substrate, said texturing resulting in a Ra of said substrate less than 2.2 Å.  
   
   
       37 . Method of  claim 36  further comprising depositing said magnetic layer over said substrate.  
   
   
       38 . Method of  claim 37  further comprising one or more intermediate layers between said substrate and said magnetic layer.  
   
   
       39 . Method of  claim 38  further comprising mounting said substrate with said magnetic layer formed thereon in a disk drive.  
   
   
       40 . Structure comprising: 
 a substrate textured with abrasive particles having a size less than or equal to about 20 nm and having a Ra less than 2.2 angstroms.    
   
   
       41 . Structure of  claim 40  further comprising a magnetic recording layer formed above said substrate, said magnetic recording layer exhibiting anisotropy.  
   
   
       42 . Structure of  claim 41  further comprising one or more intermediate layers formed between said substrate and said magnetic layer.  
   
   
       43 . A magnetic disk drive comprising the structure of  claim 41 .  
   
   
       44 . A magnetic data storage medium substrate textured with abrasive particles sufficiently small to leave a Ra less than 2.2 angstroms while permitting a magnetic layer deposited over said substrate to exhibit magnetic anisotropy.  
   
   
       45 . Structure of  claim 44  further comprising a magnetic layer formed over said substrate, said layer exhibiting magnetic anisotropy.  
   
   
       46 . Structure of  claim 45  further comprising one or more intermediate layers formed between said substrate and said magnetic layer.