A Dual Gate BCMD pixel has a compact size, nondestructive readout; complete reset with no kTC-reset noise generation, anti-blooming protection, and column reset capability. The annular gap is formed between an inner circumferential surface of a hole portion provided in an outer circumferential jig and an outer circumferential surface of an inner circumferential jig disposed in the hole portion, and has a heating region and a cooling region. A rotor position sensor provides a signal to the control unit. The method may also comprise the use of a dispersion medium which is capable of undergoing a controllable phase change from a liquid phase to a solid phase. In addition, the metal-containing transaction card may be anodized, coated, or laser-engraved. The rings are mutually connected by bridges.