Abstract
Magnetoelastic (ME) coupling, a property of major importance in heteroepitaxy, describes the dependence of the free energy of magnetic materials on strain/stress. Using our versatile ultrahigh vacuum cantilever beam magnetometer we have investigated the ME constant B 2 of epitaxial Fe(001) films in the thickness range of 2–100 nm, where the films are characterised by the magnetisation and the magnetic anisotropy of bulk Fe. Similar to B 1 both the magnitude and sign of B 2 depend on the film stress. B 2 decreases linearly with increasing stress and changes its sign at ca. 4 GPa. For stress-free Fe(001) films the bulk value of B 2 is obtained.
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