Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1802768 | Journal of Magnetism and Magnetic Materials | 2008 | 4 Pages |
Abstract
NdFeB films with Nd compositions varied from 13.34 to 24.30Â at% were deposited by DC gradient sputtering using targets Nd12.5Fe71.5B16 and Nd. The hard magnetic properties, grain growth direction and magnetic domain structures were dramatically influenced by Nd composition. The samples with intermediate Nd concentrations exhibited optimal magnetic properties and microstructures, such as large squareness ratio over 0.9, large energy product up to 174Â kJ/m3, and vertical domain structure. However, the samples with higher and lower Nd compositions showed almost isotropic loops. (0Â 0Â l) as main X-ray diffraction peaks in the optimal Nd composition region indicated most of Nd2Fe14B grains with c-axis perpendicular to the film plane, while NdFeB grains in other region are almost random growth. The good magnetic properties can be attributed to the vertical growth of Nd2Fe14B grains.
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Condensed Matter Physics
Authors
Shandong Li, Dawei Wang, Jianglin Fang, Jenq-Gong Duh, Yinying Wang, Yizhi Wu, Junheng Huang, Hongjun Zheng,