2013 Fiscal Year Final Research Report

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

Research Project

Project/Area Number	23655133
Research Category	Grant-in-Aid for Challenging Exploratory Research
Allocation Type	Multi-year Fund
Research Field	Functional materials chemistry
Research Institution	Osaka City University
Principal Investigator	TEKI YOSHIO 大阪市立大学, 理学(系)研究科(研究院), 教授 (00180068)
Project Period (FY)	2011 – 2013
Keywords	電子スピン共鳴 / 分子デバイス測定 / 時間分解ＥＳＲ / 高速ＤＳＰロックインアンプ
Research Abstract	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.