Abstract
Measurements of birefringence in an Fe3O4 magnetic fluid with isopar-M as a liquid carrier were undertaken as a function of temperature for 100<T<320 K and in magnetic fields up to 2 kOe. The results show that the birefringence increases with temperature exhibiting a maximum at a certain temperature Tm. The position of Tm decreases with increasing field intensity. For T≳Tm the birefringence follows a Curie–Weiss-type behavior. The ordering temperature changes not only in magnitude but also in sign with increasing field intensity, being negative for H≳500 Oe.
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