J. Phys. Colloques
Volume 49, Numéro C8, Décembre 1988
Proceedings of the International Conference on Magnetism
Page(s) C8-1631 - C8-1632
Proceedings of the International Conference on Magnetism

J. Phys. Colloques 49 (1988) C8-1631-C8-1632

DOI: 10.1051/jphyscol:19888745


R. W. Erwin1, J. J. Rhyne1, J. Borchers2, M. B. Salamon2, R. Du2 et C. P. Flyn2

1  National Bureau of Standards, Gaithersburg, MD 20899, U.S.A.
2  University of Illinois, Urbana-Champaign, IL 61801, U.S.A.

The magnetic structure of Er | Y superlattices has been determined by neutron diffraction and squid magnetometry on single crystal samples grown on sapphire substrates by molecular-beam-epitaxy techniques. The turn angle in the Er layers is magneto-elastically "clamped", and in fact locks-in to the commensurate state ω = 2π / 7 below about 35 K. For the [Er13 | Y26] superlattice the low temperature state is not 2π / 7 but can be shifted to that value by a magnetic field, since this state has a net moment of 8 µB / 7 atoms along the c-axis.