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

本文研究了利用非均匀磁场下的电子迁移现象--磁泳法来检测微粒中的电子自旋共振（ESR）。在频率为0.1 ~ 20 GHz的微波辐射下，测量了分散在有机液体中的氯化锰水溶液微滴的磁泳速度。结果，仅在磁场满足ESR条件的位置处观察到磁泳速度的轻微降低。因此，可以从磁化率的降低来检测微粒中的ESR。然而，速度下降的区域比预期的要宽。对微波功率的空间分布应进行更详细的讨论，更有效的辐照方法是磁泳ESR清晰观察的必要条件。

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.