The investigation of the process of magnetization in FeNiBSi glasses by means of the Barkhausen jumps |
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| Institution: | 1. Institute of Environmental Sciences and Engineering, School of Civil and Environmental Engineering, National University of Sciences and Technology (NUST), Islamabad, Pakistan;2. National Culture Collection of Pakistan (NCCP), Land Resources Research Institute (LRRI), National Agriculture Research Center (NARC), Islamabad, Pakistan;3. School of Social Sciences and Humanities, National University of Sciences and Technology (NUST), Islamabad, Pakistan;4. Centre for Agricultural Biochemistry and Biotechnology, University of Agriculture, Faisalabad, Pakistan |
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| Abstract: | The Barkhausen jumps occuring during the magnetization of the amorphous Fe-Ni-B-Si alloys have been studied by the measurements of the derivative of magnetization with respect to time (dM/dt). The peaks in dM/dt vs. applied field (H) are reproducible after averaging over some fifty cycles of magnetization. The investigation of the variations of dM/dt with the applied field (H) and with the instantaneous magnetization (M) accompanied with the same studies, but performed starting from different values of the initial remanence (Mri), completes our earlier analysis of the process of magnetization in these alloys. It is shown that the model of Chikazumi used for the explanation of the variations of remanent magnetization, coercive field and loss with the maximum magnetization (Mm) is consistent with the observed Barkhausen jumps. The possibility of separation of contributions from particular domain walls to the process of magnetization in soft magnetic materials (which would enable the determination of the locations and strengths of the particular pinning centres) is briefly discussed. |
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