Abstract
Ion implantation of epitaxial Fe/MgO/Fe magnetic tunnel junctions exhibitingantiferromagnetic exchange coupling by spin polarized tunneling has been performed. X-rayreflectivity and transmission electron microscopy experiments were performed toextensively study the structural changes of the junctions. Electron holography andvibrating sample magnetometry experiments show that the amplitude and the nature ofthe coupling are modified by the irradiation. A gradual increase in the bilinear and thebiquadratic coupling has been measured when the ion dose increases. For large doses, thenet coupling becomes ferromagnetic. This corresponds to an intermixing of the MgObarrier with the adjacent Fe layers which is demonstrated by x-ray reflectivity.
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