Epitaxial growth and magnetic properties of RM5 thin films (R=rare earth, M=Ni,Co,Fe) prepared by laser ablation deposition (abstract)

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Abstract
Different experimental methods have been developed in recent years for the preparation of metallic thin films and multilayers in which the individual layers consist of a simple element. We are developing another method, laser ablation deposition, which permits the congruent evaporation and deposition of almost any target to be obtained and is thus well suited to the preparation of thin films of intermetallic compounds. A major obstacle in the development of this technique in the past has been the formation of droplets, expelled from the target which pollute the prepared films. This has been solved recently with the use of a velocity selector to eliminate the droplets. YNi5 thin films, of thicknesses between 50 and 200 Å, have been found to grow epitaxially on sapphire substrate, with the [0001] and [101̄0] sapphire directions being parallel, respectively, to the [0001] and [112̄0] YNi5 directions. YCo5 thin films, with thicknesses between 20 and 200 Å, have been subsequently grown on YNi5. Their magnetic properties have been studied using a SQUID magnetometer. Finally, test experiments to grow Y-Fe compounds on such substrates will be reported.

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