Magnetic recording medium, magnetic tape cartridge, and magnetic recording and reproducing device

A magnetic recording medium comprising:

• a non-magnetic support;
• and
• a magnetic layer containing a ferromagnetic powder,
• wherein an arithmetic average roughness Ra of a surface of the magnetic layer is 2.1 nm or less,
• a fluorine concentration A obtained by X-ray photoelectron spectroscopy performed on the surface of the magnetic layer at a photoelectron take-off angle of 10 degrees is 6 atom % or more and 50 atom % or less, and
• B, which is calculated by Equation 1 from an integrated intensity Ftotal of fragments derived from a fluorine-containing compound obtained for an entire region in a thickness direction of a cross section of the magnetic layer by line profile analysis of TOF-SIMS and an integrated intensity Fupper of fragments derived from a fluorine compound obtained for a region from the surface of the magnetic layer to an intermediate thickness in the thickness direction of the cross section, is 67% or more and 95% or less, said intermediate thickness being defined as T/2 where T is a thickness of a magnetic layer,
• B=(Fupper/Ftotal)×100 (Equation 1).