Cancellation of the internal and hyperfine fields at the Sn119 nuclei in Ho has been observed following application of an external magnetic field, and hysteresis of the hyperfine interaction was observed after the field was removed. A connection is established between these phenomena and the realignment and "freezing" of the magnetic structure.
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![](/ps/1377/article_20870_800_head.png "Cancellation of the internal and hyperfine fields at the Sn<sup>119</sup> nuclei in Ho has been observed following application of an external magnetic field, and hysteresis of the hyperfine interaction was observed after the field was removed. A connection is established between these phenomena and the realignment and "freezing" of the magnetic structure.")