| 摘要 |
The object of the present invention is to provide a magnetic recording medium, particularly, a tape for data backup, which is less in wear of head, small in output deterioration and high in recording density. According to the present invention, there is provided a magnetic recording medium comprising a non-magnetic support having on one side at least one non-magnetic undercoat layer and a magnetic layer in succession and on another side a back coat layer, in which the magnetic layer is an ultra-thin magnetic layer having a thickness of not more than 0.20 mum provided by adjusting a standard deviation of histogram obtained by measuring the surface roughness of the magnetic layer by a light interference surface roughness meter to not more than 0.56 nm.
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