Effective magnetic anisotropy of nanocrystalline Nd-Fe-Ti-N hard magnetic alloys |
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| Authors: | Z.-Q. Jin W. Tang J.-R. Zhang H.-X. Qin Y.-W. Du |
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| Affiliation: | (1) National Laboratory of Solid State Microstructures and Institute of Solid State Physics, Department of Physics, Nanjing University, Nanjing 210093, China, CN;(2) Department of Material Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China, CN |
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| Abstract: | The intermetallic compound Nd-Fe-Ti-N has been successfully synthesized by a mechanical alloying process. The structure and magnetic properties of the sample have been studied using X-ray diffraction and magnetic measurements. It is found that alloy exhibits a nanocrystalline ThMn12-type tetragonal structure with lattice parameters of a=0.8723 nm and c=0.4896 nm. The saturation magnetization MS and effective magnetic anisotropy Keff of the compound have been determined by investigating magnetization processes. The calculated results based on the law of approach to magnetic saturation have been successfully used to determine the constant Keff. The difference between observed and calculated values in magnetization is lower than 3%. Of all terms in the law of approach to saturation, it is the 1/H 2 term, which is attributed more to non-compensated anisotropy energy, that has the prevailing effect for the compound. The absorption of nitrogen is found to increase unit cell volume, MS and Keff. Received: 28 October 1996 / Revised: 14 March 1997 and 4 August 1997 / Accepted: 8 August 1997 |
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| Keywords: | PACS. 75.50.Bb Fe and its alloys - 75.60.-d Domain effects magnetization curves and hysteresis |
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