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In this paper, we investigated the Co2TiX (X = Ge, Sn) Heusler alloys bystructural, magnetic and spin polarization measurements to probe thehalf-metallic nature. Alloys are synthesized using the arc melting technique,and found to exist in L21 crystal structure with Fm-3m space group. Curietemperature (TC) is found to be 384 and 371 K for Co2TiGe and Co2TiSnrespectively. The saturation magnetization (MS) value of 1.8 and 2.0 Bohrmagneton/f.u. are obtained at 5 K for for Co2TiGe and Co2TiSn respectively,compared to 2.0 Bohr magneton/f.u. calculated by Slater-Pauling rule. To obtainthe spin polarization value, differential conductance curves are recorded atthe ferromagnetic/superconducting point contact at 4.2 K. The current spinpolarization (P) value of 0.63 and 0.64 are deduced for Co2TiGe and Co2TiSnrespectively. Considering the high current spin polarization and TC, thesematerials appear to be promising for spintronic devices.

Spin polarization studies in half-metallic Co2TiX (X = Ge and Sn) Heusler alloys