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Developments of our highly sensitive THz ESR systems are presented. One method is the ESR detection using a micro-cantilever, and we achieved the sensitivity of about 1011 spins/G up to 315 GHz. Another method is the ESR detection up to 315 GHz using a commercial SQUID magnetometer.
Spin dynamics of S=2 triangular lattice antiferromagnet have been investigated by the submillimeter and the millimeter wave ESR measurements of polycrystalline samples of InMnO3. Single absorption line is observed in whole temperature range from 2.0 K to 265 K. The resonance field shifts due to the development of internal field are observed below 40 K. The spin dynamics of InMnO3 will be discussed...
We have succeeded in observing THz electron spin resonance (ESR) of Co Tutton salt at 315 GHz using the micro cantilever. The achieved sensitivity is about 109 spins/G at 4.5 K. As far as we know, this is the highest frequency achieved for the highly sensitive cantilever THz ESR. The result opens an application of THz ESR to the nano-science.
Cu3(OH)4SO4, which was obtained by the hydorothermal synthesis, was studied by our high frequency electron spin resonance (ESR) measurements. It has an interesting magnetic structure which consists of triple chains of Cu2+ spins (s=1/2). It undergoes the 3D-transition below 5.3 K. In the ordered state, the magnetic moment of the central chain becomes zero. This interesting behavior is called as "idle...
The edge states in the finite S=1 Haldane chain are expected to have different energy structures depending on the chain length due to the interaction through the finite chain. Electron spin resonance (ESR) signals coming from the finite chains with various chain length have been observed separately in Y2BaNi0.96Mg0.04O5, which is a famous Haldane system doped with non-magnetic ions, due to the high...
Submillimeter wave ESR of stoichiometric powder samples of Mott-Hubbard insulator RTiO 3 (R = Y, La) has been performed in the frequency region from 50 to 300 GHz. The EPR was observed for YTiO 3 at T > T c = 30 K and the nearly isotropic g-value 1.92 was obtained. The anisotropic FMR observed below T c for YTiO 3 . On the other hand, very weak EPR was observed...
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