Pengaruh Penambahan Unsur Kromium terhadap Sifat Magnetik Lapisan Ni90Co5Fe5-xCrx (x=0,1,2,3,4) yang Disintesis dengan Metode Elektrodeposisi = Effects of Cr Composition on Magnetic Properties of Ni90Co5Fe5-xCrx (x=0,1,2,3,4) Films Synthesized by Electrodeposition Method