The structural and magnetic properties of metastable face-centered-cubic (fcc) Fe thin films on fee Co(100) substrate were studied using wedged samples, fee Co(100) was chosen for the substrate because it is structurally very similar to Cu(100) but is ferromagnetic at room temperature. Reflection high energy electron diffraction and low energy electron diffraction characterizations confirm that epitaxially grown (MBE) Fe on Co(100) is structurally very similar to Fe on Cu(100) : face-centered-tetragonal (fct) for d(Fe)< 6 ML, fee for 6 ML < d(Fe) < 11 ML, bcc for d(Fe) > 11 ML. In situ surface magneto-optic Ken effect measurements show that at room temperature the fct and bcc regions are ferromagnetic, while the fee region is nonferromagnetic with some magnetic live layers. All magnetizations are in-plane. Oxygen absorption experiments suggest that these live layers are at the Fe/Co interface. Low temperature growth Fe/Co(100) shows a Ken signal that increases linearly with d(Fe) and suggests that the magnetic moments for fee Fe and bcc Fe are the same. To further study the magnetic properties of the nonferromagnetic "fcc" phase, we used metastable fee Fe as a spacer layer between two Co layers. The Co/fcc Fe/Co on Cu(100) sandwiches exhibit ferromagnetic coupling, strong antiferromagnetic coupling (AFC) and weak AFC. An oscillation in the strong AFC was found by artificially lengthening the thickness range of the nonferromagnetic fee phase.