Nd composition dependence of microstructure and magnetic properties for gradient sputtered NdFeB films |
| |
Authors: | Shandong Li Dawei Wang Jianglin Fang Jenq-Gong Duh Yinying Wang Yizhi Wu Junheng Huang Hongjun Zheng |
| |
Affiliation: | 1. Department of Physics, Fujian Normal University, Fuzhou 350007, China;2. Center for Materials Analysis, Nanjing University, Nanjing 210093, China;3. Department of Materials Science and Engineering, National TsingHua Universtiy, Hsinchu, Taiwan |
| |
Abstract: | NdFeB films with Nd compositions varied from 13.34 to 24.30 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 174 kJ/m3, and vertical domain structure. However, the samples with higher and lower Nd compositions showed almost isotropic loops. (0 0 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. |
| |
Keywords: | 81.15.Cd 75.50.Ww 75.70.Kw 75.70.&minus i |
本文献已被 ScienceDirect 等数据库收录! |
|