Magnetic oscillation of crystal without spontaneous moment caused by single-ion anisotropy achieved by a horseshoe magnet above 1000 K

Temperature dependence of anisotropy of magnetic susceptibility Δχ was studied up to T=1000 K for various oxide crystals using a method based on field-induced rotational-oscillation of a sample; Δχ-T relationships followed the Curie-Weiss law for muscovite, talc, Mg(OH)2, Al(OH)3, AlOOH orthoclase and corundum. The Δχ-values are above 10-7 emu/g at T=1000 K for many of the measured oxides; spontaneous magnetic moments due to spin ordering are usually lost at this temperature. This magnitude of Δχ is large enough for micro-crystals, which are dispersed in fluid medium, to be aligned below B=1 T that can be produced by a permanent magnet. Alignment at low field intensity is effective to extend various field-induced materials processing at high temperatures, for example, crystal growth of high quality