Studies of the Magnetization Reversal Processes in Nd-Fe-B Type Magnets

I. Wnuka, A. Przybyła, M. Kaźmierczakb, c aDepartment of Physics, Faculty of Production Engineering and Materials Technology, Częstochowa University of Technology, al. Armii Krajowej 19, 42-200 Częstochowa, Poland bComplex of Schools in Słupia, Primary School, Słupia 281, 28-350 Słupia Jędrzejowska, Poland cComplex of Schools in Goleniowy, T. Kościuszki 20, 42-445 Szczekociny, Poland

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In the present work the analysis of the magnetization reversal processes based on the measurements of recoil curves were studied. Two series of specimens of Nd-Fe-B-type alloy were investigated: (i) melt-spun ribbons and (ii) mechanically alloyed magnets. It was shown that in both cases annealing of the samples causes change of the magnetic properties. This is an effect of the evolution of the microstructure and phase constitution driven by the annealing. Based on the recoil curves measurements the Mrev (Mirr) curves were constructed. Furthermore, the minor hysteresis loops allowed to determine the dependences of coercivity on the maximum external magnetic field. These two approaches allowed concluding about the magnetization reversal processes.

DOI:10.12693/APhysPolA.138.166 topics: magnetic properties, nanocrystalline structure, magnetic hysteresis loop, magnetization reversal process