  It is widely believed that integer quantum Hall systems do not have
fractional excitations. Here we show the converse to be true for a class of
systems where integer quantum Hall effect emerges spontaneously due to the
interplay of itinerant electrons and noncoplanar magnetic ordering. We show
that magnetic $Z_2$ vortices in such systems, whose topological stability is
guaranteed by the structure of the order parameter, indeed carry fractional
charge.
