Magnetic Ejection and Oscillation of Diamagnetic Crystals Observed in Microgravity

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概要

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• Translations induced by a field gradient force are newly reported on various diamagnetic crystals that are released in microgravity (μG) produced by a drop capsule. A crystal released near a field center ($B \sim 1$ T) with negligible initial velocity translates through a diffused gas medium, in a direction of monotonically decreasing field. In a given field distribution, the velocity of the crystal uniquely depends on the intrinsic diamagnetic susceptibility $\chi_{\text{DIA}}$ of the material; velocity is independent of the mass $m$ of particles. The general features of rotational oscillation caused by field-induced anisotropy energy are studied on the basis of previous experimental data; the rotational oscillation of a magnetically stable axis with respect to the direction of homogeneous field has recently been observed for various diamagnetic crystals in μG. At a given field intensity, the period of oscillation is uniquely determined by the intrinsic diamagnetic anisotropy $\Delta\chi_{\text{DIA}}$ and $Im^{-1}$ of crystals; $I$ denotes the moment of inertia of crystals. The period is independent of $m$. In a long duration of μG, field-induced translation and rotation are generally observable for diamagnetic solids at low field intensities. By observing the two motions in μG, $\chi_{\text{DIA}}$ and $\Delta\chi_{\text{DIA}}$ are obtained without introducing a sample holder, and without performing $m$ measurement; magnetization becomes detectable for a single particle with a limitlessly small size, under the condition that field-induced motions of particles are observed.

• 2010-06-15

著者

• Uyeda Chiaki

  Institute Of Earth And Planetary Science College Of General Education Osaka University

• Chiaki Uyeda

  Institute of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan

• Hisayoshi Keiji

  Institute of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan

• Kanou Shun

  Institute of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan

• Keiji Hisayoshi

  Institute of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan

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