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标题：Attempt to detect diamagnetic anisotropy of dust-sized crystal orientated to investigate the origin of interstellar dust alignment
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作者：T. Takeuchi ; K. Hisayoshi ; C. Uyeda 等
期刊名称：Earth, Planets and Space
电子版ISSN：1880-5981
出版年度：2013
卷号：65
期号：3
页码：193-197
DOI：10.5047/eps.2012.05.007
出版社：Springer Verlag
摘要：Diamagnetic anisotropy Δ χ dia was detected on a submillimeter-sized calcite crystal by observing the rotational oscillation of its magnetically stable axis with respect to the magnetic field direction.The crystal was released in an area of microgravity generated by a 1.5-m-long drop shaft.When the oscillations are observable, the present method can measure Δ χ dia of crystal grains irrespective of how small they are without measuring the sample mass.In conventional Δ χ measurements, the background signal from the sample holder and the difficulty in measuring the sample mass prevent measurement of Δ χ dia for small samples.The present technique of observing Δ χ dia of a submillimeter-sized single crystal is a step toward realizing Δ χ dia measurements of micron-sized grains.The Δ χ dia values of single micron-sized grains can be used to assess the validity of a dust alignment model based on magnetic torque that originates from the Δ χ dia of individual dust particles. Key words Dust alignment diamagnetic anisotropy magnetic rotational oscillation.
关键词：Dust alignment ;diamagnetic anisotropy ;magnetic rotational oscillation