33 Magnetostructural Properties of Mechanical Milled Sm25Fe75 Alloy

Wednesday, November 4, 2009
Ballroom A+B (Camino Real Hotel)
Jose Trinidad Elizalde Galindo, Professor Researcher , Department of Basic Science, Universidad Autonoma de Ciudad Juarez, Cd. Juarez, Mexico
Gloria E Rodriguez Vazquez , Department of Basic Science, Universidad Autonoma de Ciudad Juarez, Cd. Juarez, Mexico
Jose Rurik Farias Mancilla , Department of Basic Science, Universidad Autonoma de Ciudad Juarez, Cd. Juarez, Mexico
Carlos Santillan Rodriguez , Division de Fisica de Materiales, Centro de Investigación en Materiales Avanzados, Chihuahua, Mexico
Jose andres Matutes Aquino, Researcher , Division de Fisica de Materiales, Centro de Investigación en Materiales Avanzados, Chihuahua, Mexico
Nanocrystalline Sm25Fe75 powders with high coercivity HC were prepared by mechanical milling and subsequent annealing. Annealing was carried out at temperature T equal to 800 °C, and times t ranging from 1 to 6 minutes. X-ray diffraction, magnetization measurements and scanning electron microscopy were used to study the microstructure and magnetic properties of these samples. The analisys of X-ray diffraction patterns demonstrate that the average grain size of the nanocrystalline powders depends on the annealing time t: ranges from 15 nm (for t = 1.5 minutes) to 80 nm (for t = 6.0 minutes). In addition, scanning electron microscopy images showed a small particle size for all samples. Finally, magnetic measurements performed at room temperature indicates high coercivity values (HC > 4 kOe) for best sample, where was found a strong annealing-induced grain size dependence.
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