Open AccessMagnetic phase transitions in Ba0.5Sr1.5Zn2Fe11.92Al0.08O22 hexaferrites
Author(s) -
Borislava Georgieva,
Svetoslav Kolev,
K. Krezhov,
Chavdar Ghelev,
Daniela Kovacheva,
Lan Maria Tran,
M. Babij,
A. J. Zaleski,
Bénédicte Vertruyen,
Raphaël Closset,
T. Koutzarova
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1762/1/012034
Subject(s) - materials science , magnetization , magnetic hysteresis , phase (matter) , analytical chemistry (journal) , magnetic field , hysteresis , scanning electron microscope , condensed matter physics , annealing (glass) , nuclear magnetic resonance , chemistry , metallurgy , composite material , physics , organic chemistry , chromatography , quantum mechanics
We report studies on the effect of substituting the magnetic Fe 3+ cations with nonmagnetic Al 3+ cations in Y-type hexaferrite Ba 0.5 Sr 1.5 Zn 2 Fe 11.92 Al 0.08 O 22 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.