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 UHV cantilever beam magnetometer we have investigated the ME coupling constants ${B}_{1}$ and ${B}_{2}$ of epitaxial Fe(001) films in the thickness range of 2--100 nm, where the films are characterized by the magnetization and the magnetic anisotropy of bulk Fe. Both constants exhibit a strong dependence on the film stress above 0.1 GPa and even change sign at stress values in the GPa range. Whereas ${B}_{2}$ decreases linearly with film stress up to 6 GPa, ${B}_{1}$ saturates after a steep linear increase at 2--3 GPa. Stress-free Fe(001) films exhibit bulk behavior.
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