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Ni-substitution effect on the properties of Ba0.5Sr1.5Zn2-xNixFe12O22 powders

  • Koutzarova, T.
  • Kolev, S.
  • Krezhov, K.
  • Georgieva, B.
  • Ghelev, C.
  • Kovacheva, D.
  • Vertruyen, Bénédicte
  • Closset, Raphaël
  • Tran, L. M.
  • Babij, M.
  • Zaleski, A. J.
Publication Date
Jan 01, 2020
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We consider the influence of the magnetic cation (Ni2+) substitution on the structural and magnetic properties of Ba0.5Sr1.5Zn2-xNixFe12O22 (x = 0.8, 1, 1.5) powders. The powders were synthesized by using the citric-acid sol–gel auto-combustion method. Their ac-magnetization was measured in an ac-magnetic field with an amplitude of 10 Oe and a frequency of 1000 Hz to detect any magnetic phase transitions. A strong influence of the Ni-substitution on the magnetic properties was thus observed. A magnetic phase transition from a helicoidal to a ferrimagnetic spin order at 284 K was observed for the sample Ba0.5Sr1.5Zn0.5Ni1.5Fe12O22. The magnetic-phase transition from conical spin order to hellicoidal spin order was registered at 149 K and 177 K for x = 0.8 and x = 1, respectively. Triple hysteresis loops were observed for all samples at 4.2 K, which indicates the presence of two kinds of ferromagnetic states with different magnetization values. © 2020 Elsevier B.V.

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