A semiconductor device correctly switches endian modes regardless of the current endian mode of an interface. When electric currents flows from the in-plane free layer side to the perpendicular free layer side, both free layers exchange spin information and thereby rotate their respective magnetizations almost antiparallel to each other and along a boundary surface with high-speed. Accordingly, productivity can be increased. The method preferably involves delivering the probiotic, prebiotic or composition via a delivery tube, such as an enteral feeding tube, directly to a position downstream of the stomach, most preferably to the jejunum. The auxiliary layer includes a dot-like first region covered with the magnetic dot pattern, and a second region not covered with the magnetic dot pattern. A semiconductive polymer capable of luminescence in an optical device is provided.