Investigation on the structural and magnetic properties of MxBi2-xTe3 (M = Gd, Fe, Cr) (x=0, 1) using colloidal hot-injection method

Gadolinium-doped bismuth telluride (GBT), ferric-doped bismuth telluride (FBT) and chromium-doped bismuth telluride (CBT) nanocrystals have been synthesized using colloidal hot-injection method with same doping ratio. Field-oriented uniaxial anisotropic ferromagnetic properties for all the samples were analysed from the squareness ratio (M-r/M-s), K-1 (magnetocrystalline anisotropic constant), K-1(v) (shape anisotropic constant), K-eff (effective anisotropy constant) and magnetic energy using vibration sample magnetometer. The magneto-impedance (MI) spectral ratio (Delta Z/Z(0))% has been influenced by rotational magnetization, as well as domain wall motion with respect to applied magnetic field. The results have proven that the GBT thin film sample exhibits the maximum MI effect. Our results may shed light on the simple method of synthesis and development of the effective MI materials based on rare-earth/transition-doped bismuth telluride for the realization of magnetic sensor applications in future.