Materials Research Bulletin, Vol.101, 162-166, 2018
The relation of magnetic properties and anomalous Hall behaviors in Mn4N (200) epitaxial films
The Mn4N(200) films were grown on MgO(100) substrates by molecular beam epitaxy. The saturated magnetizations are 0.735 mu B/f.u. and 0.892 mu B/f.u. under pressure of 7.5 x 10(-6) mbar-9.5 x 10(-6) mbar. Increasing of growth pressure enhances the magnetism of Mn4N due to the reduction of nitrogen vacancies. Debye temperature (TD) of Mn4N is estimated to be 86K. The longitudinal resistivity is linear to T-1.9994 when T < T-D, which coincides with electron-electron scattering of ferromagnetic coupling. The longitudinal resistivity originates from electron-electron scattering below T-D since electron-phonon scattering is frozen. The longitudinal resistivity at 0 K is about 10% lower than 5 K as 7.085 mu Omega cm. Mn4N films show obvious anomalous Hall Effect in perpendicular magnetic fields. The anomalous Hall resistivity (rho(AH)) of Mn4N film is obtained by subtracting the ordinary Hall resistivity from transverse resistivity. The rho(AH) is verified to be linear to magnetization at low magnetic field strength region (0-9 KOe).