Dresden 2017 – scientific programme

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MA: Fachverband Magnetismus

MA 55: Thin Films: Magnetic Anisotropy

MA 55.3: Talk

Thursday, March 23, 2017, 15:30–15:45, HSZ 101

Impact of Au interlayer on magnetoelasticity of Fe/Au/Fe sandwich — •Kenia Novakoski Fischer and Dirk Sander — Max Plack Institute of Microstructure Physics - Halle

Magnetic metallic structures separated by a nonmagnetic spacer are used in magnetic recording media and related devices. The interlayer exchange coupling between ferromagnetic (FM) layers shows an oscillatory response as a function of the spacer thickness. This effect is attributed to the influence of the quantum-well states in the nonmagnetic layer [1]. In this work, we shed light on the understanding of the impact of this nonmagnetic spacer layer on the magnetoelastic coupling of ferromagnetic films. The magnetoelastic coupling coefficients are obtained from measurements of the stress change of FM layers upon a magnetization reorientation [2]. We acquire the values of the magnetoelastic coupling coefficient B1 for Fe (15 ML)/Au (X ML)/Fe (10 ML) layers on Au (001), where X varies from 0 to 12 ML. Up to 2 ML Au, B1 remains constant at -1.3 MJ/m3. With increasing Au thickness B1 exhibits a non-monotonic behavior. We observe a non-monotonic variation of magnitude 3 MJ/m3 in an increment of Au thickness of 1 ML at a spacer thickness near 9 ML. The results of the magnetoelastic coupling in the Fe films sandwiched by Au are discussed in view of the interlayer exchange coupling of the ferromagnetic layers.

[1] J.E. Ortega et al., Phys. Rev. B 47, 1540, (1993); J. Unguris et al., Phys. Rev. B 75, 6437, (1994); W. Geerts et al., Phys. Rev. B 17, 12581, (1994).

[2] D. Sander, Rep. Prog. Phys. 62, 809 (1999).