Magnetic Properties of Copper oxide


As mentioned in the section on optical properties, photoluminescence and magnetic properties are the least studied for CuO nanomaterials; however, CuO nanostructures showed interesting and unique magnetic properties, so it is worth summarizing this topic. CuO, different from other antiferromagnetic transition metal monoxides such as NiO, MnO, and CoO, shows magnetic order above Neel temperature. Kimura et al. The ferromagnetic or antiferromagnetic ordering in CuO single crystal could be controlled by fine-tuning the bond angle between in-plane Cu-O-Cu. Large bond angle Cu-O-Cu was believed to result in considerable superexchange interaction, favored for antiferromagnetism, while spiral ordering in specific crystallographic directions favors a ferroelectric phase in the same material. Due to the complex dependence on the temperature of the spin structure, CuO typically shows two antiferromagnetic transitions at 213 K and 230 K, respectively. The first Neel temperature is related to commensurate to incommensurate growth, whereas the second one is attributed to incommensurate to paramagnetic transition. A few groups reported a hysteresis loop or a bifurcation in FC-ZFC curves as evidence for ferromagnetism in CuO nanostructures [45]. For CuO nanomaterials, some reports showed that magnetic properties could vary depending on the size of the nanostructures. For example, Punnoose et al. [46] showed that the susceptibility of CuO nanoparticles is inversely proportional to the particle size for particles smaller than 10 nm. The magnetic behaviors of CuO nanoparticles more significant than 10 nm are similar to the bulk material. However, the morphology of CuO nanostructures should also play an essential role because other authors showed that ferromagnetism could also arise in nanosheets, nanoneedles, and so on of larger size. If you are looking for high quality, high purity, and cost-effective copper oxide, or if you require the latest price of copper oxide, please feel free to email contact mis-asia.

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