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thermal radiation emitted by a %hot cobalt wire in the temperature range from$T\approx 400\,$K up to melting. The radiation is linearly polarizedperpendicular to the wire.  $P$ decreases from $30\,\%$ just above room temperature down to$6.5\,\%$ near melting and does not show any particular behavior neither atthe martensitic {\em hcp}$-${\em fcc} transition at $\approx 700\,$K nor atthe Curie point at $ \approx 1400\,$K. However, $P$ shows a rapid decreasefor $T\gtrsim 1000\,$K and, contrary to previous measurements with tungstenwires, it hysteretically behaves if the temperature change is reversed. Thisbehavior is rationalized by %taking into account accounting for theirreversible thermal demagnetization of the wire with magnetic domain sizechange.

Influence of irreversible demagnetization on the polarization of thermal radiation emitted by a hot cobalt wire