Abstract
In the course of magneto‐optical studies of the metamagnet FeCl2 with H⇒ along [0001], we have encountered unexpected hysteresis phenomena on traversing the mixed phase region. The basic experiment consisted of measuring the net Faraday rotation of monochromatic light passing through a macroscopic area in the center of a much larger sheet as the magnetic field was slowly swept (102 Oe/sec) at constant temperature. This provided a sensitive measure of the magnetization. Below the 21.15K tricritical point, antiferromagnetic and paramagnetic phases may coexist over a finite range of applied field. Especially below 4.2K, hysteresis is seen along the low field boundary of the mixed phase region. The variation of the hysteresis with temperature suggests that the process is thermally activated.
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