A smart label comprises a circuitry pattern on a smart label substrate and a structural part comprises an integrated circuit on a chip on a structural part substrate. The electric motor device includes: a first drive member that has a plurality of permanent magnets; a second drive member that has a plurality of electromagnetic coils; and a clearance controller that shifts at least either one of the first drive member and the second drive member, thereby changing a size of a clearance formed between the first drive member and the second drive member. The oxide layer includes Fe and at least one kind of metal selected from a group consisting of Zr, Ti, and Hf.