We have succeeded in observing THz electron spin resonance (ESR) of Co Tutton salt at 315GHz using the micro cantilever. The achieved sensitivity is about 10{sup}9 spins/G at 4.5K. 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.
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