Influence of low-temperature annealing on magnetic properties of (Nd0.625Ni0.375)85Al15 metallic glass |
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| Authors: | Feng Xu Zhiming Wang Guang Chen Jianzhong Jiang Youwei Du |
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| Affiliation: | aDepartment of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;bSchool of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China;cDepartment of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;dPhysics Department and National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China |
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| Abstract: | After a review of the selection process of (Nd0.625Ni0.375)85Al15 as a metallic glass with a relatively high glass-forming ability, we investigate the influences of its phase transitions by duplicating the heating process of the isochronal thermal analysis with low-temperature annealings. The structure, thermal stability and magnetic properties are characterized. And the influences on magnetic properties are particularly discussed with emphasis. Both the annealing processes, to the glass-transition temperature and to the onset temperature of crystallization, bring about a higher coercivity of the sample and a higher freezing temperature of the spin-glass-state. For the sample annealed to the onset temperature of crystallization, the influence is quite obvious and is ascribed to the formation of ferrimagnetic Nd7Ni3 phase, as detected by XRD. For the sample annealed to the glass-transition temperature, the indistinct influence is further identified with the analysis of the frequency dependence of the spin-glass-state, and it is mainly attributed to the change of the short-range order in the amorphous matrix. |
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| Keywords: | Metallic glasses Spin glasses Magnetic measurements |
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