Lubricant for magnetic recording medium, magnetic recording medium, manufacturing method of magnetic recording medium, and magnetic recording and reproducing device

1. A lubricant for a magnetic recording medium which includes an organic compound having a fullerene skeleton,

wherein the organic compound having the fullerene skeleton is expressed by the following general formula (i),

wherein A is a group in which any one hydroxyl group (OH) on a terminal of a fluoro compound in the following general formulas (1) to (6) is not included, and at least one hydroxyl group (OH) on at least one other terminal is substituted by any one of hydrogen (H), a methyl group (CH 3 ), and a trifluoro methyl group (CF 3 ), and is connected as a terminal of the organic compound having the fullerene skeleton through a portion in which the hydroxyl group (OH) is not included, R 1 is an organic group having 1 to 24 carbon atoms, m is an integer of 0 to 5, n is an integer of 1 to 4, R2 and R3 of the following general formulas (1) to (6) are perfluoro ether groups shown by the following general formulas (a) to (h), and p, q, r, s, t, u, v, w, x, y, and z of the following general formulas (a) to (h) are integers of 1 to 100

2. The lubricant for a magnetic recording medium according to claim 1 ,

wherein the organic compound in the general formula (i) is an organic compound in the following general formula (ii)

3. The lubricant for a magnetic recording medium according to claim 1 ,

wherein the organic compound having the fullerene skeleton is an organic compound in which at least one hydroxyl group (OH) on a terminal of an organic compound in the following general formula (iii) is substituted by any one of hydrogen (H), a methyl group (CH 3 ), and a trifluoro methyl group (CF 3 ), and an average molecular weight of the organic compound is in a range of 3000 to 7000,

wherein R2 is a perfluoro ether group in the general formulas (a) to (h), and p, q, r, s, t, u, v, w, x, y, and z of the general formulas (a) to (h) are integers of 1 to 100

4. A magnetic recording medium, comprising:

at least a magnetic layer, a protective layer including carbon, or carbon and hydrogen, and a lubricant layer including the lubricant for a magnetic recording medium according to claim 1 , on a non-magnetic substrate, in this order.

5. A manufacturing method of a magnetic recording medium, comprising:

preparing a base including at least a magnetic layer and a protective layer on a non-magnetic substrate in this order; and

forming a lubricant layer on the protective layer by immersing the base in a solution for forming a lubricant layer contained in an immersion tank, and then by pulling up the base from the immersion tank at a constant rate,

wherein the solution for forming a lubricant layer includes an organic compound having a fullerene skeleton, and a fluorine-based solvent,

the organic compound having the fullerene skeleton is an organic compound in the general formula (i) according to claim 1 , and

solubility of the organic compound having the fullerene skeleton with respect to the fluorine-based solvent is in a range of 0.001 mass % to 2 mass %.

6. A magnetic recording and reproducing device, comprising:

the magnetic recording medium according to claim 4 ;

a medium driving unit driving the magnetic recording medium in a recording direction;

a magnetic head performing recording and reproducing of information with respect to the magnetic recording medium;

a head movement unit relatively moving the magnetic head with respect to the magnetic recording medium; and

a recording and reproducing signal processing unit performing processing of a recording and reproducing signal from the magnetic head.