Abstract
Thin epitaxial iron overlayers and sandwiches on Cu(001) have been investigated by spin-polarized photoemission. The magnetization was measured as a function of perpendicularly applied field and temperature. Up to 14 monolayers (ML) of iron grow epitaxially on Cu(001) in the fcc phase and are ferromagnetic. At 30 K a remanence magnetization perpendicular to the plane of the film is observed for both the Fe/Cu(001) and the Cu/Fe/Cu(001) systems with Fe layers thicker than 2 ML. The coercive field, measured as function of temperature for a 10-ML Fe film, decreases rapidly from 2.7 kOe at 30 K to about 50 Oe at 200 K. The Curie temperature is 300 K for films thicker than 8 ML and increases for thinner films up to 500 K. The transition from fcc to bcc iron occurs at 15 ML. It is recognized by a jump of the Curie temperature to 1000 K and by the disappearance of the remanence magnetization at 30 K. Simultaneous evaporation of Fe and Cu at various rates also results in epitaxial overlayers with characteristic magnetic features. The fcc Fe films are suitable for thermomagnetic recording. Writing and reading has been carried out by a UV excimer laser. Reading was performed by analyzing the sign of the spin polarization of the photoelectrons.
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