Abstract
We succeeded in growing ultrathin Fe(110) films in ultrahigh vacuum sandwiched between Au(111), which show ferromagnetic behaviour even below monolayer coverage. For the first time, low-temperature magnetization measurements on such Au-Fe-Au sandwiches reveal a switching of the easy axis from the film plane to the film normal in iron films thinner than 3 monolayers (ML). We interpret this as an interface effect. The usually dominating shape anisotropy is overcompensated by a magnetic interface anisotropy at smaller iron coverages. The effective magnetic anisotropy field at 10 K is proportional to the inverse iron thickness down to 2 ML. The related interface anisotropy field is determined to 40 kOe per single Fe(110)-Au interface.
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