  We observe multiple step-like jumps in a Dy-Fe-Ga-based ferrimagnetic alloy
in its magnetic hysteresis curve at 2 K. The observed jumps have a stochastic
character with respect to their magnitude and the critical field of occurrence,
and the jumps do not show any temporal effect. The jump size distribution
follows a power law variation indicating the scale invariance nature of the
jumps. We have invoked a simple two-dimensional random bond Ising-type spin
system to model the dynamics. Our computational work can qualitatively
reproduce the jumps and their scale invariant character. It also elucidates
that the flipping of antiferromagnetically coupled Dy and Fe clusters is
responsible for the observed discrete avalanche-like features in the hysteresis
loop. These characteristics indicate that the present phenomenon can be well
described within the realm of self-organized criticality
