Magnetic properties and structure of bulk nanocrystalline Sm(CoCuFeZr)(7.6) sintered magnet

作者：Zhang Dongtao^*; Yue Ming; Yang Jianjun; Xu Gang; Liu Weiqiang; Zhang Jiuxing; Liu Xubo

来源：Journal of Applied Physics, 2009, 105(7): 07A707.

DOI：10.1063/1.3067860

Structure and magnetic properties were studied for Sm(Co0.74Cu0.12Fe0.1Zr0.04)(7.6) nanocrystalline ball milled powders and bulk magnet consolidated via spark plasma sintering technique. The amorphous milling powders crystallize to TbCu7 structure or a mixture of Th2Zn17 and CaCu5 structures when annealed below or above 1023 K, respectively. The coercivity of the powders decreases from 1.27 to 0.56 T as the annealed temperature increases from 923 to 1223 K. The bulk magnet also exhibits a TbCu7 structure with an average grain size of 32 nm. Magnetic measurements show that the remanence is 0.49 T and the coercivity reaches as high as 1.42 T. The Mr/Ms ratio of 0.63 demonstrates the existence of intergrain exchange coupling among the nanograins. The magnet exhibits the coercivity of 0.27 T at 773 K.

• 出版日期2009-4-1
• 单位北京工业大学