Isostructural magnetic phase transitions and the magnetocaloric effect in Ising ferromagnets

Abstract

It is shown that the first-order isostructural magnetic phase transition between antiferromagnetic phases with different magnitudes of the antiferromagnetism vector induced by an external magnetic field in Ising antiferromagnets can be related to entropy. It is found that, depending on the temperature, the entropy jump and the corresponding heat release can change their signs at the phase transition point. In the low-temperature region of the metamagnetic first-order phase transition the entropy jump is positive, while the entropy jump is negative near the triple point for isostructural magnetic phase transitions. V

Novel Multiferroic‐Like Nanocomposite with High Pressure‐Modulated Magnetic and Electric Properties

“…The anomalous appearance of the FM contribution in the PM/(PM+FE) phase (see the inset in Figure 5) is a consequence of a metamagnetic phase transition [ 7a,34 ] in the FM/(AFM+FE) phase. The metamagnetic phase transition is a reorientation process with the “order–order” type phase transition induced by a field, which changes the type of magnetic ordering [ 35 ] or an angle between magnetic sublattices in the magnet. [ 36 ] The metamagnetic phase transition can be induced not only by external H but also internal H int .…”