| abstract |
(57) [Summary] [Purpose] To obtain a thin-film metal magnetic recording medium excellent in running property, durability and storability. In a magnetic recording medium having a ferromagnetic metal thin film on at least one surface of a non-magnetic support, a phosphorus compound having a short carbon chain and a long carbon chain represented by the following formula are provided on the ferromagnetic metal thin film. It is a magnetic recording medium in which at least one phosphorus compound is present. Embedded image However, R is a fluorine-containing hydrocarbon chain or a carbon-hydrogen chain having a carbon number of 4 or more and 10 or less, or a carbon number of 14 or more and 21 or less, and n is an integer of 1 or more and 3 or less, M is hydrogen, an alkali metal, or ammonium. Alternatively, it is a primary to quaternary alkylammonium. [Effect] A strong protective film can be obtained. |