Magnetoresistance in metals with embedded magnetic nano-clusters
  We propose a kinetic theory of transport in metals embedded with ferromagnetic nanoclusters, describing the dependence of the form of magnetoresistance on anisotropy characteristics of the ensemble of clusters and the influence of the electron spin depolarisation by clusters. We note that this effect is strongest when all the clusters have the same intrinsic easy-axis anisotropy. 
O. Tsyplyatyev, Vladimir I. Fal'ko