Abstract
The size dependence of diamagnetic orientation is reported on micron-sized graphite grains suspended in liquid ethanol at room temperature. The experiment was performed as a preliminary step to reproduce the magnetic alignment of astronomical dust particles in space. The mean grain sizes of the two samples were 2.5 and 3.8 μm in diameter with the field of full orientation H S being 35.9 and 29.0 mT, respectively. The present H S obtained for graphite grains are the smallest values compared to any of the reported data on micron-sized particles. The diamagnetic orientation may be applicable to explain the grain alignment in the cosmic dense cloud of a star formation region.
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