MAGNETISM OF CO THIN-FILM WITH PERPENDICULAR ANISOTROPY GROWN ON AU LAYER

Single Co film with a thickness of d (d=0.3-1.8 nm) was prepared on a Au buffer layer in an ultrahigh vacuum (10(-10) Torr) system using ele ctron beam evaporation. Temperature dependence of the uniaxial anisotr opy constants was evaluated up to the fourth order from the result of electron spin resonance study. The critical exponent gamma' for the sa mple of d=0.3 nm was evaluated to be gamma'=1.71+/-0.01, which is clos e to the theoretical value of 7/4 for the two-dimensional Ising system . (C) 1997 American Institute of Physics.