@inproceedings{oai:jaxa.repo.nii.ac.jp:00013506,
 author = {植田, 千秋 and Ueda, Chiaki},
 book = {宇宙利用シンポジウム　第23回　平成18年度, Space Utilization Research: Proceedings of the Twenty-third Space Utilization Symposium},
 month = {Mar},
 note = {Magnetic alignment appears in important devices such as a compass, an electric generator or a memory disc; at present, only effects of spontaneous magnetic moments are used. Here we report that alignment occur for ordinary solid that do not contain spontaneous moment; alignment occurred by anisotropy of magnetic susceptibility Delta(sub chi). Rotational oscillation of a magnetically stable axis with respect to static field was observed for biotite, calcite, forsterite, graphite, muscovite, talc and urea at a low field of 0.11 T produced by a horseshoe magnet. Delta(sub chi) above 4 x 10(exp -8) emu/g are obtained from the period of oscillation tau = 2 pi x (I/(M x Delta(sub chi)))(exp -1/2) x B(exp -1); this was realized because restoration torque of the fiber that suspended the crystal was negligible. Sensitivity for measuring Delta(sub chi) can be improved drastically by realizing the oscillation in microgravity, where the fiber itself is deleted; oscillations were achieved for KDP (Potassium Dihydrogen Phosphate), gypsum, Rochelle salt and urea at B = 1.3 T. Higher sensitivity is necessary to obtain small Delta(sub chi) values; this can be done by increasing tau according to the above equation, and is realized by a parabolic flight or in an orbital laboratory. Characteristics of spontaneous moment have long been conceived to the public by rotational oscillation of a compass caused by terrestrial field, which led to invention of the above mentioned devices. In a same sense, rotational motions of ordinary crystals reported here may induce new types of applications in various fields that are not related to magnetism at present. Magnetically active property may be recognized for almost all the solid materials when sensitivity of Delta(sub chi) reach the level of 10(exp -11) emu/g in an parabolic flight., 資料番号: AA0063349008},
 pages = {29--32},
 publisher = {宇宙航空研究開発機構宇宙科学研究本部, Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA/ISAS)},
 title = {浮遊試料の磁気回転振動を用いた高感度での磁場配向特性の検出},
 year = {2007}
}