Welcome to fascinating nanomagnetism and spintronics research !
The group's research focus is on nanoscale magnetism and spin related effects, aiming at discovering novel concepts in condensed matter physics. Research study in nanostructures allows us to address the challenging questions in the field of spin-related phenomena by artificially designing and fabricating nanostructures. A number of remarkable new physical effects associated with the conservation law of angular momentum and energy have been already discovered designing artificial interfaces, where strong electron-phonon-spin coupling emerges at nanoscale. Quite the opposite, revealing the physics underlying provides a fundamental basis and means for manipulating the physical phenomena. The group's current research topics are divided into the following key themes.
Quasi-particle transmission and tunnelling
Spin waves are low-lying collective excitation, which propagate in ferromagnetic and antiferromagnetic materials via exchange and magnetostatic interaction. The quantized quasiparticle is called a magnon. In general, magnons propagate in magnetic materials. However, if an energy barrier for magnons., e.g., an antiferromagnetic layer, is inserted in the propagation path, it may be possible to observe the tunnelling phenomena of magnons. Our interest in this research study is how magnons transmit across ferromagnetic/antiferromagnetic/ferromagnetic interfaces.
Cross-correlations in multiferroic heterostructures
Multiferroics are fascinating materials that possess more than one order parameters such as magnetization, electric polarization, etc. Since there exist cross-coupling between these order parameters in multiferroics, you can manipulate magnetization by an electric field. However, single phase multiferroics that show room temperature ferromagnetism and ferroelectrics are very rare. In this study, our interest is to design and create multiferroic properties at ferromagnetic/ferroelectric interfaces and to get insight into the physical mechanism of the multiferroic properties.
Correlation of spin current and magnetic orders
When electrons flow across a ferromagnetic/nonmagnetic interface, spin angular momentum accumulate close to the interface, generating diffusive spin current in the nonmagnet. The spin current interacts with localized moments in the material and a non-equillibrium spin state is generated. Our interest in this topic is how spin current can generate such a non-equillibrium spin state as a consequence of the interaction between spin current and localized magnetic moments.
Department of Physics
Nagoya University
Furo-cho, Chikusa, Nagoya 464-8602, Japan
Office (Prof. Taniyama)：Science Hall Room #416
Phone：+81-52-789-2886
Office (Students)：Science Hall Room #418
Phone：+81-52-789-2870