We develop the novel research fields using electronic and magnetic spectroscopies. Our objectives are the creations of “spin-orbitronics” at the interfaces. These are exciting and challenging subjects combining both physics and chemistry. Please ask us if you have some interests for the following researches.
1. Measurements of orbital magnetic moments
Magnetic atom such as 3d transition metals possesses the orbital magnetic moments which are smaller than the spin moments. They affect to the physics through the spin-orbit interaction. Especially at the interfaces between magnetic layer and insulators, the interface chemical bonding can control the perpendicular magnetic anisotropy (PMA) by the symmetry breaking. We focus on the x-ray magnetic circular dichroism (XMCD) techniques for detecting the orbital moments. We conduct the novel research fields using this technique, which brings the “spin-orbitronics” research fields.
2. Developments of novel techniques applying external fields
We develop the novel systems in XMCD and Mossbauer spectrometry. For the creation of spin-orbitronics, the spectroscopies combined with the transport measurements for the detection of non-equilibrium conditions are needed. We pursue the electronic and magnetic states during applying the external fields. In order to control the spin and orbital magnetic moments, external perturbations of electric field, pulsed laser light, and thermal effects are introduced into the conventional XMCD systems.
3. Physics and Chemistry in molecular ferromagnets, ferromagnetic metals, and ferromagnetic semiconductors
We are interested in the ‘induced magnetism’ through the intermediated exchange interactions. The candidates of carriers between local spins are electrons, holes, and radicals in molecules. Induced magnetism in non-magnetic elements is also interesting. We synthesize these kinds of systems using chemical approach.
Since the complex molecular magnets have an advantage of the flexible properties, they can be easily controlled and the distortion can be easily introduced. Using above original spectroscopic techniques, we aim to synthesis the novel “molecular magnetic semiconductors” combining chemistry and applied physics.
On the other hand, we earn to focus thoroughly for the interfaces in the stacked thin-film structures using the 3d transition metals which are utilized in spintronics devices. Artificial structures can be designed in stacked thin films. We develop the structures enhancing the orbital moments, which brings the orbitornics at the interfaces through the symmetry breaking and enhancement of spin-orbit interaction.
4. Development of the calculation methods including the ligand-field effects
In order to analyze the core-level spectra, we need the precise simulation methods. We develop the calculation methods concerning the electron correlation, the hybridization between wave functions, the distortion, and the ligand effects within the cluster models. Especially, we conduct the interpretation of the anisotropic XMCD spectra taken under the external fields.
