Structure and magnetic properties of Fe1.14Cr1.86Se4 ferrimagnet: Negative magnetization and its dependence on magnetic field

Small single crystals of the Fe1.14(7)Cr1.86(8)Se4.0(2) ferrimagnet were grown using chemical vapor transport. Fe1.14Cr1.86Se4 adopts the Cr3S4 structure with two metal sites. The magnetic behavior of Fe1.14Cr1.86Se4 can be described by two magnetic sublattices with different magnetization values and different temperature dependencies. Depending on the experimental conditions, such as the strength and direction of the cooling field, magnetization reversal, large negative magnetization and high-temperature compensation point may result. If the cooling field exceeds 1.5Oe, magnetization reversal occurs at low temperatures. If the cooling and applied fields are opposite, a large negative magnetization and high-temperature compensation point are observed.