Design of a Novel Magnet Exhibiting Photoinduced Magnetic Pole Inversion Based on Molecular Field Theory

Abstract

We show a novel magnetic phenomenon, “photoinduced magnetic pole inversion”, which occurs even in the absence of an external magnetic field. The key of this strategy is to control the compensation temperature by a pure photoprocess. Here, we combined two magnetic behaviors which were developed recently. One of them is the photoinduced change of magnetization for some of the Prussian blue analogues. The other is a so-called mixed ferro-ferrimagnetism in the system of ternary metal Prussian blue analogues. We show a strategy to obtain this phenomenon based on molecular field (MF) theory and we design new classes of ternary metal Prussian blue analogues, (FeIIxMnII1-x)1.5[CrIII(CN)6]·zH2O, including photosensitive FeII−CrIII sites. Their magnetic properties, such as saturation magnetization, coercive field, Curie temperature, and compensation temperature, were controlled by changing the compositional factor x. When the material for x = 0.40 was irradiated by visible light under a weak external magnetic field...