SOME STRUCTURAL-PROPERTIES OF SOLID HE FILMS - CONSEQUENCES ON HE-3 FILM FERROMAGNETISM

Presently available experimental data on neutron diffraction, elastic properties, specific heat, high temperature susceptibility for solid h elium films adsorbed on Grafoil and theoretical calculations of the en ergy of the fluid ave used to give an estimate of first and second sol id layer densities as a function of total coverage, Important informat ion on the second layer phase diagram is deduced from this analysis. I n He-3 films, the knowledge of the second-layer-solid density rho(2)(x ) as a function of fetal coverage x is essential to elucidate the orig in of ferromagnetism for two solid films in the presence of a fluid th ird layer.