Magnetic properties of Y-type trigonal ferrites first-order magnetization processes in trigonal systems

  • Bolzoni F
  • Pareti L
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Magnetic properties of the single crystal ferrite Ba2(Zn1-xCox)2Fe12O22with O ≤ x ≤ 1, which has a trigonal symmetry around the c-axis, were investigated. The presence of Co ion strongly affects the properties of the Y-type ferrite: easy cone of magnetization, spin reorientation phase transition and first-order magnetization processes (FOMP) have been observed in this system. The observed effects as well as the origin of the magnetocrystalline anisotropy are discussed on the basis of a phenomenological analysis. The anisotropy constants K1, K2and Kttrigonal of the ferrite are given versus temperature and composition. The magnetic phase diagram of a trigonal system is also presented. The condition for the existence of FOMP are obtained in term of the anisotropy constants ratios. © 1984.

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  • F. Bolzoni

  • L. Pareti

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