Materials Fabrication for Magnetics / Spintronics by Artificial Nanostructure Control


 Magnetic properties based on electron spins and transport properties of electrons are closely correlated in magnetic nanostructures, which makes it possible to control electric signals (current/voltage) by magnetic signals (magnetization), and conversely, magnetic signals by electric and/or optical signals. A new electronics utilizing these mutual controls is called "Spintronics".

 Particularly, we are interested in magnetic ordered alloys or nanoparticles, and fabricate nanolayered structures, tunnel junctions or composite device structures with these materials to investigate novel magnetic and magnetotransport properties. Prominent results obtained to date include the observation of spin accumulation and the determination of spin lifetime in metallic nanoparticles, the discovery of giant spin-Hall effect in a system with perpendicularly magnetized FePt, and the enhancement of the giant magnetoresistance effect in a half-metallic Heusler alloy system. Recently we are proceeding with the study from the viewpoint of spin current, a fundamental concept in spintronics, and study on the interaction between spin current and thermal energy, which is called "Spin caloritronics".

  Recent problem of resource depletion requires of us the development of noble metal-free and rare earth-free hard magnetis. We are also doing on the fabrication of new ordered alloys with hard magnetic properties, which consists of only 3d transition metals such as Fe, Co, Ni.