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We present studies of structural, magnetic and electrical properties ofZn/1-x-y/Cd/x/Mn/y/GeAs/2/ nanocomposite ferromagnetic semiconductor sampleswith changeable chemical composition. The presence of MnAs clusters induces inthe studied alloy room temperature ferromagnetism with the Curie temperature,TC, around 305 K. The chemical composition of the chalcopyrite matrix controlsthe geometrical parameters of the clusters inducing different magnetoresistanceeffects in the crystals. The presence of ferromagnetic clusters in the alloyinduces either negative or positive magnetoresistance with different values.The Cd-content allows a change of magnetoresistance sign in our samples fromnegative (for x = 0.85) to positive (for x = 0.12). The negativemagnetoresistance present in the samples with x = 0.85 is observed attemperatures T < 25 K with maximum values of about -32% at T = 1.4 K and B = 13T, strongly depending on the Mn content, y. The positive magnetoresistancepresent in the samples with x = 0.12 is observed with maximum values notexceeding 50% at B =13 T and T = 4.3 K, changing with the Mn content, y.

Magnetoresistance control in granular Zn/1-x-y/Cd/x/Mn/y/GeAs/2/ nanocomposite ferromagnetic semiconductors