Weak-ferromagnetism of quasi two-dimensional manganese stearate

It is known that the salts of fatty acids (soaps) may have layered structures with inter-layer spacings of 50 Å or more. If the metal ion is from the transition or rare-earth groups, there is the possibility of forming interesting quasi two-dimensional magnetic materials. This is verified by measurements on manganese stearate, which we find undergoes a transition to weak-ferromagnetic order at about 5°K. © 1976.