Patent ID: 6878445

Claim:
A method of producing a nanoparticle coated material, including a support and a nanoparticle layer formed on the support, wherein the nanoparticle layer contains nanoparticles, which include a CuAu-type or Cu 3 Au-type hard magnetic ordered alloy, and wherein the method satisfies at least one of the following conditions (i) and (ii): (i) the method comprises a step of forming a shielding layer on the support before forming the nanoparticle layer; and (ii) a step of forming the nanoparticle layer comprises the steps of: applying a coating liquid containing nanoparticles consisting of an alloy having a disordered phase and having at least two metals having different oxidation-reduction potentials on the support to form a coating film; and irradiating laser light on the coating film.