Magnetophoretic Detection of Electron Spin Resonance in a Single Micro-Particle

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We have examined to detect electron spin resonance (ESR) in a micro-particle by using magnetophoresis, which is migration phenomenon under an inhomogeneous magnetic field. Magnetophoretic velocity of micro-droplets of manganese dichloride aqueous solution dispersed in an organic liquid was measured with irradiation of microwave, whose frequency was from 0.1 GHz to 20 GHz. As a result, slight decrease of magnetophoretic velocity only at the position where the magnetic field met the condition of ESR was observed. Therefore, it was suggested that ESR in micro-particle could be detected from the decrease of the magnetic susceptibility. However, the region where the velocity decreased was broader than that expected. More detailed discussion about the spatial distribution of microwave power should be discussed, and more effective method for irradiation is essential for clear observation of ESR by magnetophoresis.