ISSP - The institute for Solid State Physics

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Miwa Group
Associate Professor
MIWA
Shinji

Research Associate
SAKAMOTO,
Shoya

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We study experimental condensed-matter and material physics using high-quality and unique nano-structures. We employ ultrahigh vacuum technique, which has been used for semiconductor engineering, for the multilayer fabrication with metals, insulators, and organic molecules. We focus on spin and orbital properties, which can be pronounced in nano-structure, and fabricate quantum spintronics devices with metals, quantum materials, and functional molecules. Our research purpose is to characterize the physical properties in such devices and use them for application. Recently, we study spin-dynamics using microwave voltage/current and femtosecond pulse laser systems. We also study microscopic origin of the various spintronics phenomena using operando X-ray absorption spectroscopy. Using the obtained knowledge, we design and fabricate spintronics devices showing large effects at room temperature.

(a) An example of novel multilayer with characteristic nano-structure. By using conventional materials such as Fe, Pt, and Pd, we fabricated novel multilayer device with new physical phenomena. (b) An example of operando X-ray spectroscopy. We conducted the operando X-ray magnetic circular dichroism spectroscopy under electric-field application to the MgO dielectric, and found a change in electronic state in interfacial Pt layer. The origin for the voltage-controlled magnetic anisotropy, which is important for future non-volatile random access memory, has been revealed.
(a) Functional device using spin-dynamics in nano-magnets. (b) Schematic of spin-dynamics and potential. If we precisely control the spin-potential, non-linear effect can be enhanced. We find that signal-to-noise ratio in the spin-torque diode effect in nano-magnets can be enhanced by the non-linear effect.

Research Subjects

  1. Spintronics device using quantum materials
  2. Operando X-ray spectroscopy to reveal device physics
  3. Interface engineering to develop device performance
  4. Brain-inspired computing using spintronics