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Loop bifurcation and magnetization rotation in exchange-biased<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>Ni</mml:mi><mml:mo>โ</mml:mo><mml:msub><mml:mi>FeF</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Exchange-biased $\mathrm{Ni}โ{\mathrm{FeF}}_{2}$ films have been investigated using vector coil vibrating-sample magnetometry as a function of the cooling field strength ${H}_{FC}$. In films with epitaxial ${\mathrm{FeF}}_{2}$, a loop bifurcation develops with increasing ${H}_{FC}$ as it divides into two sub-loops shifted oppositely from zero field by the same amount. The positively biased โฆ