Control of Magnetic Phase Transition Using Interfacial Magnetic Frustration Effect

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In this research project, we have experimentally examined whether it is possible to control the magnetic properties of(antiferromagnetic) materials, such as magnetic structures and magnetic transition temperatures, using magnetic frustration effect at ferromagnetic/antiferromagnetic interfaces. Clear evidence that the magnetic properties can be controlled by the frustration effect was not obtained experimentally, so that it was found difficult to control the magnetic properties by this effect at the present stage. On the other hand, the project has boosted up the technique to prepare high-quality ferromagnetic and antiferromagnetic thin films. Some new ferromagnetic alloys which do not exist in natural equilibrium states were successfully prepared using atomically controlled alternate deposition. The nuclear resonant scattering with synchrotron radiation, which has been a key measurement technique to perform this project, also has been improved remarkably as a tool to study magnetism of thin films.