A rectifier circuit configured with a conventional configuration using an operational amplifier and a diode by a thin film transistor over an insulating substrate cannot exhibit the performance of a rectifier circuit due to the low stability of operational amplifier and the low high-frequency characteristic. Accordingly, in a portion where the insulating film side small holes are not formed, the conductive reflective film does not come into contact with the electrolytic solution, as the result, a ferrocene ion is not reduction-reacted. The conjugates provided herein are used to lessen or inhibit these processes to prevent or at least lessen the resulting secondary effects. The multiple models may be constrained based on a pre-processing measurement of the sample. Further, for preventing defoliation of the shield upon fabrication of the air bearing surface, a thickness for a portion away from the main pole is increased.