TAILIEUCHUNG - Magnetization and Magnetoresistance of Particulate Sr2FeMoO6 Samples Prepared via Sol-gel Route and Heat Treatment in H2/Ar Atmospheres
The magnetization data were discussed based on the influence of impurity phase and cation antisite disorder parameter. The magnetoresistance results were analyzed based on the models of spin– dependent electron scattering and electron tunneling through grain boundaries. | VNU Journal of Science: Mathematics – Physics, Vol. 32, No. 4 (2016) 45-51 Magnetization and Magnetoresistance of Particulate Sr2FeMoO6 Samples Prepared via Sol-gel Route and Heat Treatment in H2/Ar Atmospheres Le Duc Hien1,2, Dao Thi Thuy Nguyet1, Luong Ngoc Anh1, To Thanh Loan1, Nguyen Phuc Duong1,*, Ta Van Khoa2, Than Duc Hien1 1 International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology, 1 Dai Co Viet, Hanoi, Vietnam 2 Technology Institute–General Department of Defense Technology, Duc Thang, North Tu Liem, Hanoi, Vietnam Received 10 November 2016 Revised 29 November 2016; Accepted 28 December 2016 Abstract: Double perovskite Sr2FeMoO6 samples were prepared via sol-gel route followed by heat treatment in reduce gas atmosphere of H2/Ar (10 vol.% H2) at 900–1100 C for 8 hours. All the samples contain the main phase Sr2FeMoO6 with tetragonal structure (space group I4/m) and a certain amount of secondary phase SrMoO4 with contents being dependent on annealing temperature. Magnetic properties of the samples were investigated by means of vibrating sample magnetometer (VSM) in temperature range 80–450 K and in magnetic fields of 10 kOe. Their magnetoresistance in applied fields of 10 kOe was also studied at room temperature. The magnetization data were discussed based on the influence of impurity phase and cation antisite disorder parameter. The magnetoresistance results were analyzed based on the models of spin– dependent electron scattering and electron tunneling through grain boundaries. Keywords: Sr2FeMoO6, sol-gel, antisite disorder, magnetization, magnetoresistance. 1. Introduction Sr2FeMoO6 (SFMO) belongs to the double perovskite family with half-metallic ground states in which conduction electrons are fully spin polarized and have ferromagnetic transition temperatures well above room temperature (TC > 400 K). Consequently, this material has tremendous potential for applications in the field of spintronics
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