According to one embodiment, a magnetic recording layer is coated with a fine particle coating solution containing fine particles coated with a protective layer containing a first additive including a straight-chain structure for increasing wettability to the magnetic recording layer, and a carboxyl group or the like, and a second additive including a carboxyl group or the like and a polymerizable functional group, each fine particle having, on at least a surface thereof, a material selected from Al, Si, Ti, V, Cr, Mn, Fe, Co, Ni, Zn, Y, Zr, Sn, Mo, Ta, W, and oxides thereof, thereby forming a fine particle monolayer, and heat or light energy is applied, thereby curing the protective layer and forming a periodic pattern.