Anelasticity in an Mn-Ferrite Single Crystal

概要

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Anelastic behavior in a single crystal of Mn ferrite (Mn....Fe....0.) wasstudied at temperatures between 280 and 730 K by longitudinal vibrations of125 kHz. The acoustic loss curve showed three kinds of internal friction peaks.One of them appeared very near to the Curie temperature and was very sensitiveto applied magnetic field and strain amplitudes of vibrations. This peak wasexplained by magneto-mechanical coupling factor and the loss tangent of magneticpermeability.Another peak was observed at 500 K by longitudinal vibrations along the[1104 and [1114 directions but not along [1004. This was independent of strainamplitudes of vibrations and external magnetic field. The activation energy ofthis peak was estimated as 0.78 eV and explainecl by mutual exchange betweencations and their vacancies on the octahedral sites in the spinel lattice.The last one was at 300 K and independent of strain amplitudes of the vibrationsand magnetic field. This peak was much smaller than the abc>ve two peaks.
社団法人日本物理学会の論文
1978-09-15