Magnetic properties and evidence of current-induced perpendicular field in epitaxial ferrimagnetic Mn_4N (002) film mixed with (111) phase

摘要

The magnetic properties and anomalous Hall effect of the Mn_4N (002) film mixed with the (111) phase were investigated. The lessened magnetization of hysteresis loops at a low field and the peak at about 50 K of the temperature-dependent magnetization curves display that magnetocrystalline anisotropies play a significant role in the magnetic properties of the film. Moreover, the centres of the anomalous Hall loops are shifted to the left for positive currents and show the opposite shift for negative currents, which may indicate the presence of current-induced effective fields. It is proposed that the (111) phase in the film could not only supply the magnetization m derivation from the c aixs but also afford asymmetric interfaces to induce effective fields. The effective perpendicular field arises from the perpendicular components of the effective fields.