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Effect of co Addition on Magnetic Properties of Nanocrystalline FINEMET Alloy

TavaKoli, Zeinab | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40382 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Maddah Hosseini, Hamid Reza
  7. Abstract:
  8. In this work, the effect of chemical composition on structural, mechanical, electrical and magnetic properties of nanocrystalline Finemet-type alloys with the composition of Fe73.5Si13.5B9Nb3Cu1 , Fe77Si11B9Nb2.4Cu0.6 and (〖Fe_0.5 Co_0.5)〗_77 Si_11 B_9 Nb_2.4 Cu_(0.6 )was investigated. The samples were prepared by vacuum arc melting of high purity constitution in order to obtain a nanocrystalline structure. The amorphous ribbons were then annealed under vacuum with the same conditions of temperatures and time to compare their properties. The structural and thermal properties of the samples were analyzed using various techniques such as X-ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC). electrical resistivity and magnetic measurements were used to study mechanical, electrical and magnetic properties of the samples, respectively In this paper complex permeability-frequency spectra of Fe_73.5 Si_13.5 B_9 Nb_3 Cu_(1 ),Fe_77 Si_11 B_9 Nb_2.4 Cu_(0.6 )and(〖Fe_0.5 Co_0.5)〗_77 Si_11 B_9 Nb_2.4 Cu_(0.6 ) nanocrystalline alloys were measured for studying the influence of Co on the stability of permeability of material at high frequency regimes for improving frequency application of Finemet alloys and also these alloys were studying under various AC magnetic field. It was found that variation of AC magnetic field has little effect on complex permeability spectra of (〖Fe_0.5 Co_0.5)〗_77 Si_11 B_9 Nb_2.4 Cu_(0.6 ) nanocrystalline alloy. This is attributed to the increased pinning field after substitution of Fe with Co in Fe_73.5 Si_13.5 B_9 Nb_3 Cu_(1 )nanaocrystalline alloy.

  9. Keywords:
  10. Permeability ; Frequency Response ; Magnetic Impedance ; Finemet Alloys

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