Emergent materials that exhibit two or more complex properties are attracting attention as new functional materials and are being studied with the interest of many scholars. In particular, in multiferroic materials where ferroelectricity and magnetism coexist, it is very important to understand the interaction such as the reversible flipping of polarization (magnetization) actuated by magnetic (electric) field as well as the change of dielectric constant by applied magnetic field. The causes of physical properties resulting from the interaction of two or more order functions cannot be observed with conventional macroscopic magnetometry equipment. Thus, from the point of view of an atom that can measure electronic structure and energy level, quantum mechanical experiments that satisfy the uncertainty principle are essential. Here, I would like to introduce some examples of emergent materials researched through the Mosbauer spectroscopy experiment, a quantum mechanical experimental tool.
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