Magnetic recording medium and magnetic recording/reproducing apparatus

  • US 10,559,320 B2
  • Filed: 12/16/2015
  • Issued: 02/11/2020
  • Est. Priority Date: 12/19/2014
  • Status: Active Grant
First Claim
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1. A magnetic recording medium comprising at least a magnetic layer, a protective layer and a lubricant layer in this order on a non-magnetic substrate, whereinthe protective layer is made of carbon or carbon nitride;

  • the lubricant layer which is formed on and in contact with the protective layer, comprisesa compound A represented by the following general formula (1);


    R1

    C6H4OCH2CH(OH)CH2OCH2

    R2

    CH2OCH2CH(OH)CH2OH 



    (1)wherein, R1 is an alkoxy group having 1 to 4 carbon atoms,R2 is


    CF2O(CF2CF2O)x(CF2O)yCF2

    wherein in parentheses of x and y, connection in this order, in reverse, or randomly; and

    x, y are real numbers of 0 to 15, respectively,


    CF2CF2O(CF2CF2CF2O)zCF2CF2

    wherein z is a real number of 1 to 15, or


    CF2CF2CF2O(CF2CF2CF2CF2O)nCF2CF2CF2

    wherein n is a real number from 0 to 4, anda compound B represented by the following general formula (2);


    HOCH2CF2CF2O(CF2CF2CF2O)mCF2CF2CH2OCH2CH(OH)CH2OH 



    (2)wherein m is an integer;

    a mass ratio (A/B) of the compound A with respect to the compound B is in the range of 0.2 to 3.0; and

    an average film thickness of the lubricant layer is 0.8 nm to 2 nm.

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