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| Home > Publications database > Structure and magnetic properties of ultrathin iron films deposited on the CoGa(100) surface |
| Journal Article | PreJuSER-24645 |
; ; ; ; ;
2002
APS
College Park, Md.
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Please use a persistent id in citations: http://hdl.handle.net/2128/2135 doi:10.1103/PhysRevB.66.184406
Abstract: Epitaxial bcc alpha-Fe(100) films are grown on the (100) surface of a CoGa crystal. The misfit between the Fe and the CoGa lattices is very small (<0.5%). Both, at room temperature and at 550 K layer by layer growth is found with thermal energy helium atom scattering (TEAS). The TEAS experiments show that iron films grown at 550 K on reconstructed c(4x2) CoGa(100) are smooth. The iron films are stable up to a temperature of 650 K. The magnetic properties of the Fe films are investigated with the magneto-optical Kerr effect. Fe films with a thickness in excess of 1.1-1.3 ML are ferromagnetic at 300 K, with the easy axis for magnetization oriented parallel to the surface. It is found that the coercive field H-c is sensitive to the order of the film. Upon annealing at 550-600 K subsequent to deposition, the coercive field, measured around room temperature, increases. The ordering of the film appeared to have no effect on the remanent magnetization. For a 1.7 ML Fe film a Curie temperature of 525 K is measured. At higher coverage the Curie temperature increases to above 600 K. The coercive field H-c is found to approach zero at a 50-100 K lower temperature.
Keyword(s): J
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