The atomic structure of the {110} surface of the ordered binary alloy was studied by using quantitative low-energy electron diffraction techniques. The structure of a surface with a stoichiometric composition was found to be bulk-like (1 x 1), but exhibited pronounced buckling. That is, the Fe sub-plane was raised by 0.015nm above the Rh sub-plane of the first layer. The first inter-layer spacing, as measured from the Rh sub-plane of the first layer to the bulk-like planar second atomic layer, was contracted by 0.005nm (2.4%). Non-stoichiometric (and probably Fe-poor) islands were found to exhibit a reconstruction which could be called 3 x 1, when referred to the oblique unit mesh of FeRh{110}, although its precise structure was unknown.

Atomic Structure of a {110} Surface of FeRh Alloy S.K.Kim, Y.Tian, F.Jona, P.M.Marcus: Physical Review B, 1997, 56[15], 9858-63