Developments of Multi-extreme High Field ESR in Kobe

作者：Ohta H^*; Okubo S; Ohmichi E; Sakurai T; Zhang W M; Shimokawa T

来源：Journal of Low Temperature Physics, 2013, 170(5-6): 511-519.

DOI：10.1007/s10909-012-0683-7

• High magnetic field
• Electron spin resonance
• High pressure
• Micro-cantilever

Recent developments of %26quot;multi-extreme%26quot; high magnetic field electron spin resonance (ESR) in Kobe will be reviewed. Our high magnetic field ESR covers the frequency region between 0.03 and 7 THz and the temperature region between 1.8 and 300 K. With this high magnetic field ESR system we can apply the magnetic field up to 55 T using a Cu-Ag pulsed magnet and a 300 kJ (10 kV) capacitor bank. Under this high magnetic field we can also apply the high pressure up to 1.4 GPa. As we can make the measurement under low temperature, high magnetic field and high pressure simultaneously, we name it as %26quot;multi-extreme%26quot; ESR. Moreover, in order to gain the sensitivity of our high magnetic field ESR, we have developed a micro-cantilever ESR system using a torque method, which enables the ESR measurement of micrometer size single crystal at low temperature. At the moment we are in the process of extending the magnetic field region of micro-cantilever ESR. Recently we have succeeded in making the measurement up to 369 GHz and the achieved sensitivity is about 10(10) spins/G, which is much higher than that using the conventional transmission method. Finally our development of magnetization detected ESR using SQUID magnetometer (SQUID ESR) will be also presented.

• 出版日期2013-3