Magnetic, ferroelectric, and spin phonon coupling studies of Sr3Co2Fe24O41 multiferroic Z-type hexaferrite

The magnetic, Raman, ferroelectric, and in-field ⁵⁷Fe Mössbauer studies of polycrystalline multiferroic Sr₃Co₂Fe₂₄O₄₁ are reported in this paper. From the magnetization studies, it is observed that the sample is soft magnetic in nature with low temperature magnetic spin transitions like longitudinal to transverse conical structure around 130 K and change in magnetic crystalline anisotropy from conical to planar structure at 250 K. Ferroelectric studies of the sample exhibit the spontaneous polarization at low temperature. Strong spin phonon and spin lattice coupling is observed through low temperature Raman spectroscopy. From the in-field ⁵⁷Fe Mössbauer spectroscopy, spin up and spin down site occupations of Fe ions are calculated in the unit cell.