Influence of annealing on magnetic properties of Co-based metallic glasses |
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Authors: | T Kulik H Matyja B Lisowski |
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Institution: | Institute of Materials Science and Engineering, Warsaw Technical University, Narbutta 85, 02-524 Warsaw, Poland;Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warsaw, Poland |
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Abstract: | The influence of low-temperature annealing on the magnetic hysteresis loop parameters of magnetostrictive Co-Si-B and nonmagnetostrictive Co-Fe-Si-B glasses was studied. The dependence of Curie temperature (TC), crystallization temperature (Tx), full-stress-relaxation temperature, saturation magnetostriction constant, saturation magnetization and coercive field Hc on metalloids contents for as quenched Co100-x(Si0.5B0.5)x glasses was determined.It was found that annealing enhances remanence magnetization for all investigated Co-Si-B glasses. The coercive field of these glasses is influenced by annealing owing to: stress relaxation (resulting in an Hc decrease) and domain structure stabilization (resulting in an Hc increase). Significant Hc reduction for both magnetostrictive and non-magnetostrictive glasses was observed, after annealing above TC. For glasses with TC<>Tx, it was necessary to apply an external magnetic field in ord er to decrease Hc.It was found that non-magnetostrictive metallic glasses with low Curie temperatures (TC ? 450 K) exhibit the most stable magnetic hysteresis loop parameters. |
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