Long-range atomic ordering and magnetic properties of Co1-xPtx/SiO2 granular films

The structure and magnetic properties of Co1-xPtx/SiO2 granular films with the Pt atomic content x varying from 0.42 to 0.71 have been investigated. I t was found that the CoPt grains transform from disordered fcc to the ideal ordered L1(0) structure after annealing at 680 degrees C. In the range of x=0.42-0.60, the lattice parameter ratio a/c slightly varies from 0.965 to 0.979. For the Pt content x similar to 0.7, the superstructure exists but t he lattice constant ratio is equal to 0.998. The coercivity dramatically in creases from 1.8 to 9.1 kOe and then decreases to several hundred Oe while x increases from 0.42 to 0.71 for the grain size d similar to 10 nm. We als o found that the coercivity increases with the grain size. Our results show that the highly ordered fct structure, accompanied by the high crystalline anisotropy, is a prerequisite for the high coercivity, and the coercivity can be tailored by controlling either the composition or the grain size. (C ) 2000 American Institute of Physics. [S0021- 8979(00)84708-8].