Recently, researchers from the Functional Materials Section of the Institute of Solid State Physics, Chinese Academy of Sciences, Hefei Research Institute of Materials Science have made new progress in controlling the dielectric properties of materials. The phenomenon that the dielectric properties of a material changes due to changes in the applied magnetic field is called the "magnetic dielectric effect." Materials with this effect have potential applications in resonant capacitors (which can be tunable with a magnetic field in their dielectric constant) and capacitive read heads for data storage. The large magnetic dielectric effect means that a smaller magnetic field can be used to obtain larger dielectric constants or capacitance changes. Because there is a certain correlation between the magnetoelectric effect and the magnetic dielectric effect of materials, materials with strong magnetoelectric effects may exhibit large magnetic dielectric effects. On the other hand, multiferroic materials or linear magnetoelectric materials generally exhibit strong magnetoelectric coupling. Therefore, it is possible to find a large magnetic dielectric effect in a multiferroic or linear magnetoelectric material with strong magnetoelectric coupling. Based on the above ideas, Yin Lihua, a functional material room for solid materials, cooperated with the researchers of the Strong Magnetic Field Science Center of the Hefei Research Institute of the Chinese Academy of Sciences, and conducted related research on Co4Nb2O9 single crystals with a linear magnetoelectric effect. The linear magnetoelectric effect refers to the direct relationship between the polarity (or magnetic moment) of the material and the applied magnetic field (or voltage). The researchers found that Co4Nb2O9 single crystal has a large linear magnetoelectric coupling coefficient (about 25.8 ps/m), which is about 6 times larger than typical linear magnetoelectric material Cr2O3 (~4.2 ps/m). In addition, it was found that the material exhibits a giant magneto-dielectric effect near the magnetic phase transition. That is, when the magnetic field is 8.5T, its magnetic dielectric effect can reach ~138%, second only to the multi-ferroic material DyMnO3 single crystal. The giant-magnetoelectric effect in the Co4Nb2O9 single crystal may originate from its large magnetoelectric coupling and the combined effects of spin fluctuation near the magnetic phase transition. The results of this study provide an idea for exploring materials with a low-field, strong-magnetic-dielectric effect at room temperature. The related research results were published in Applied Physics Letters (Appl. Phys. Lett. 109, 032905 (2016)) with the Colossal magnetodielectric effect and spin flop in magnetoelectric Co4Nb2O9 crystal. This work was funded by the National Natural Science Foundation of China. Cnc Turning Services,Lathe Services Near Me,Metal Lathe Services Near Me,Lathe Services Lizhi Precision Manufacturing Technology Co.,Ltd , https://www.lizhihardware.com