• Koutzarova, Tatyana
• Tran, L-M
• Closset, R.
• Ghelev, Ch
• Babij, M.
• Kovacheva, D.
• Georgieva, B.
• Kolev, S.
• Krezhov, K.
• Zaleski, A.
• Vertruyen, B.

Abstract

<jats:title>Abstract</jats:title><jats:p>We report studies on the effect of substituting the magnetic Fe<jats:sup>3+</jats:sup> cations with nonmagnetic Al<jats:sup>3+</jats:sup> cations in Y-type hexaferrite Ba<jats:sub>0.5</jats:sub>Sr<jats:sub>1.5</jats:sub>Zn<jats:sub>2</jats:sub>Fe<jats:sub>11.92</jats:sub>Al<jats:sub>0.08</jats:sub>O<jats:sub>22</jats:sub> powders on their magnetic properties and especially on the magnetic phase transitions responsible for observing the magnetoelectric effect. In this research, the Y-type hexaferrite powders were synthesized by citric acid sol-gel auto-combustion. After the auto-combustion process, the precursor powders were annealed at 1170 °C in air to obtain the Y-type hexaferrite materials. The effects of Al substitution on the structural, microstructural properties and phase content were investigated in detail using X-ray powder diffraction and scanning electron microscopy. Hysteresis measurements were performed by a physical-property-measurement-system (PPMS) (Quantum Design) at 4.2 K and at room temperature. Dc-magnetic measurements of the temperature dependence of the magnetization at magnetic fields of 50 Oe, 100 Oe and 500 Oe were used to determine the effect of applying a magnetic field on the temperature of magnetic-phase transitions. We demonstrated that the helical spin state can be modified further by varying the magnetic field.</jats:p>

Topics

• phase
• scanning electron microscopy
• phase transition
• combustion
• magnetization