Abstract
This paper presents the results of measurements of magnetostrictive properties of Mn0.70Zn0.24Fe2.06O4 ferrite for power applications. Frame-shaped samples were used for measurements to guarantee a uniform magnetizing field and magnetostrictive strain distribution. Magnetostrictive hysteresis loops were measured by semiconductor strain gauges. The results indicate that the magnetostrictive characteristic of Mn0.70Zn0.24Fe2.06O4 ferrite is non-monotonic and magnetostriction changes have opposite signs for higher values of the magnetizing field.
Highlights
Magnetostriction is the most important magnetomechanical effect connected with the changes of the size of sample made of magnetic material subjected to a magnetizing field
Strain gauge is subjected to both elongation and bending. To avoid this problem and provide a uniform distribution of both the magnetizing field as well as magnetostrictive strain, isotropic frame-shaped samples [9] made of Mn0.70 Zn0.24 Fe2.06 O4 ferrite for power applications were produced on demand by POLFER Company in specialized forms for sintering
Magnetic hysteresis loop B(H) of the Mn0.70 Zn0.24 Fe2.06 O4 ferrite for power applications is presented in the Figure 3
Summary
Magnetostriction is the most important magnetomechanical effect connected with the changes of the size of sample made of magnetic material subjected to a magnetizing field. In spite of the fact that the magnetostriction effect was described first in 1847 by Joule [1], this phenomenon is still not fully understood. Presented models of magnetostriction [2,3] are rather a general, qualitative explanation of magnetostriction mechanisms. Quantitative understanding of the magnetostrictive characteristics requires quantum effects-based models [4], which are still under development. In spite of the lack of sufficient quantitative models, magnetostriction has a great technical importance. Magnetostrictive strain is the main source of acoustic noise generated by transformers [5]
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