Two magnetically different, closely lying states of fcc iron grown on copper (100)

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Abstract
Two closely lying (in energy) states of fcc iron grown on copper (100) have been identified by magneto-optic and photoemission experiments. The as-grown state at 460 K exhibits in-plane surface ferromagnetism in magneto-optic measurements. Ferromagnetism parallel to the plane is not observed for the room-temperature state; its absence is supported by a comparison of our calculated and measured work functions and by the photoemission results. LEED shows expanded interplanar spacing at the surface. The temperature behavior and effect of fresh iron deposition indicate that the thermal transition between the two states is first order.