Optical measurement of anisotropic magnetic susceptibility for diamagnetic fine particles

Naoyuki Kitamura, Kohki Takahashi, Iwao Mogi, Satoshi Awaji, Kazuo Watanabe

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1 Citation (Scopus)


We have developed an apparatus that allows the observation of the transient rotational motion of fine particles under a high magnetic field in order to determine anisotropic magnetic susceptibility. The anisotropic susceptibilities of spherical nanoparticles of bismuth and commercially available carbon nanofibers were determined. The estimated Δ = 3.9 × 10-5 of spherical bismuth nanoparticles with a diameter of 370nm was fairly consistent with the value determined previously by the magnetic field dependence of diffraction peak intensity in the X-ray diffraction (XRD) pattern, but was slightly smaller than the value for the bulk crystal. In contrast, the transient behavior of carbon nanofibers did not obey the theoretical motion of a single crystal. The wide distribution of fiber lengths, the irregularity of the structure in the fiber, and the connections between the fibers are suggested for the anomalous behavior.

Original languageEnglish
Article number015001
JournalJapanese Journal of Applied Physics
Issue number1
Publication statusPublished - 2016 Jan


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