Development of time-resolved ESR apparatus for micro/thin-film samples toward the application of molecular device measurement

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The aim of this research is to develop ESR apparatus which can apply easily for molecular device or spintronics researches by a minimum modification of the commercial ESR apparatus. A commercial high-speed DSP lock-in amplifier and the home-made external field-modulation unit was used for the detection. The sensitivity improvement of the time-resolved ESR was carried out using high-speed phase-sensitive detection until 1 micro second of time-constant. As the results, the sensitivity improvement was achieved to some extent but some points of issue to solve were clarified. We have also made a simple electric circuit and a detection prove which can measure the electrical detection of ESR signal for the devices using the same ESR apparatus using the DSP lock-in amplifier. We made home-made programs, which control all apparatus and make the measurements of a variety of ESR possible. Furthermore, we modified the program to use for a spin-pumping that is a recent hot topic in the spintronics.