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Abstract : Internal friction in polycrystalline Nix Zn1-x Fe2O4 where x = 0.2, 0.6 and 0.8 films has been measured using one crystal composite oscillator method. The internal friction was recorded at three different frequencies i.e, 60, 100 and 160 KHz in the temperature range of 80 to 600 K. The films used are prepared by rf-sputtering method on quartz plate substate. X-ray analysis was carried out on the as prepared and annealed films to check the crystallization. MH curves at room temperature are observed using a VSM up to a magnetic field of 20 kOe. It was found that the results of X-ray diffraction and saturation magnetization are consistent each other. It was also found that the values of initial permeability in the frequency range of 1 MHz- 600 MHz are better than those of bulk materials. In all samples under investigation the internal friction with temperature three peaks at 580 , 510 and 280 K . The observed peaks and other results are compared with magnetic properties and available domain theories.





Autor: S. Murthy

Fuente: https://hal.archives-ouvertes.fr/



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