Abstract
Single crystal BCC Fe films have been stabilized on both GaAs(1 0 0)-4×6 and InAs(1 0 0)-4×2 substrates at room growth temperature. The magnetic properties of the Fe/GaAs were found to proceed via three phases determined by the growth morphology; a non-magnetic phase, a short-range-ordered superparamagnetic phase and a ferromagnetic phase above about five monolayers. A uniaxial magnetic anisotropy (UMA) was observed in ultrathin Fe/InAs(1 0 0)-4×2 films within a narrow thickness range of about 5–10ML. The easy axis is along the [0 1 1] direction rather than [0 1 ̄ 1] , the easy axis in Fe/GaAs(1 0 0)-4×6 and 4×2. As ultrathin Fe films tend to be compressed in-plane on GaAs and expanded on InAs, the strikingly different anisotropy behaviour in the Fe/GaAs(1 0 0) and the Fe/InAs(1 0 0) may indicate the importance of magneto-elastic interactions.
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