Anomalous Anisotropic Magnetoresistance And Magnetization In Mn3.69Bi95.69Fe0.62

It was found that the Mn3.69Bi95.69Fe 0.62 consists of two phases, namely of a bismuth matrix and BiMn inclusions. It is shown that the samples have a crystalline texture. Independently on the applied field orientation, maximum on the temperature dependence of magnetization is detected at Tmax ≈ 85 K, which is associated with the reorientation transition of the magnetic moments of Mn for αBiMn phase. In turn, the electrical resistivity also demonstrates maximum at Tmax ≈58 K in a magnetic field of 800 kA/m when HI. It is established that the maximum of increases and is shifted toward higher temperature Tmax ≈94 K when field increasing up to 2400 kA/m. At the same time no clear maximum on is observed for H || I. It is shown that the relative magnetoresistance,  is increased both with decreasing temperature and with increase of the magnetic field. The measured enhancement reaches ≈ 250% for H || Iand ≈ 2400% for HI in magnetic field of 2400 kA/m. Thus, the strong anisotropy of and is established both for HI and H || I. Possible explanation of observed anomalous behavior of the temperature dependences of the electrical resistivity in magnetic fields has been proposed.