Spin-glass behavior in CoSt(2) Langmuir-Blodgett multilayer films

The dc susceptibilities have been measured on cobalt stearate (CoSt(2)) Lan gmuir-Blodgett (LB) multilayer films. Two successive peaks and irreversibil ity are observed clearly in both parallel and perpendicular directions to t he c axis. These behaviors are consistent with the mean-field theory for th e Heisenberg-type spin-glass system having a weak single-ion anisotropy. Th e above behavior has never been observed in small CoSt(2) particles, so it is considered to be an inherent characteristic in the LB film structure. Th e magnetic behaviors between CoSt(2) LB films and other related compounds a re compared: and discussed. [S0163-1829(99)03142-2].