Features of magnetoresistance and magnetic properties in Bi95.69Mn3.69Fe0.62

A study of textured, polycrystalline Bi95.69Mn3.69Fe0.62 containing two phases: the bismuth matrix and inclusions of the α-BiMn phase. It is shown that the anomalous behavior of the magnetization temperature dependences can be linked to the reorientation transition of the Mn magnetic moments in the α-BiMn phase, caused by the change in the sign of the magnetic anisotropy constant. It is established that the temperature dependences of the electrical resistivity in a magnetic field are non-monotonic, and that the magnetoresistance is positive in all temperature ranges, reaching a maximum value of 3033% for a magnetic field of 140 kOe, when the magnetic field is perpendicular to the transport current. A strong anisotropy of electrical resistivity is measured in a magnetic field. It is assumed that the anomalous behavior of the electrical resistivity as a function of temperature in Bi95.69Mn3.69Fe0.62, as compared to pure bismuth, is linked to a change in the overlap between the electron and the hole Fermi su...