Abstract
In order to make a careful study of ferrofluids of single domain particles of magnetite at low temperatures it is essential to know whether the Verwey transition has taken place. We report the first clearcut evidence for its occurrence as exhibited by the magnetization of a sample cooled down from room temperature to 1K in the presence of an applied field of 8T. Removal of the field leads to a drop in the magnetization associated with a change in the direction of the easy axes in conjunction with the Verwey transition. Previous evidence, based upon the temperature dependence of Mössbauer spectra was quite weak.
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