Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 65: Poster 2

MA 65.26: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG1

Stripe domains in tetragonally distorted Fe-Co-C films with perpendicular anisotropy — •Volker Neu, Ludwig Reichel, Sebastian Fähler, Rudolf Schäfer, and Kornelius Nielsch — IFW Dresden, Institute for Metallic Materials

The tetragonal distortion of an epitaxially grown Fe-Co-C film introduces a significant perpendicular magnetic anisotropy into the otherwise cubic Fe-Co with low magnetocrystalline anisotropy. Unlike C-free films, which obtain their tetragonal distortion solely from lattice mismatch and which relaxes within a few nm, C-containing films maintain a crystallographic distortion of (c/a)_bct = 1.03 and a perpendicular magnetic anisotropy of ca. 0.4 MJ/m³ even up to thicknesses of 100 nm [1]. We present the magnetic domain structure of such a (Fe_0.4Co_0.6)_0.98C_0.02 film prepared on MgO(100) single crystal substrates. It has a thickness slightly above the critical stripe nucleation value, and hence the perpendicular anisotropy leads to a modulation of the out-of-plane magnetization in parallel stripes of 45 nm width, superimposed on large domains oriented in the film plane along the [110] and [1-10] direction. The analysis of such a multiscale domain pattern requires the combination of high resolution magnetic force microscopy (MFM) with its sensitivity to perpendicular stray fields and the large-view vectorial imaging capabilities of Kerr microscopy for in-plane magnetization. The details of the 90^∘ and 180^∘ boundaries of the large in-plane domains are resolved by MFM on a sub-50 nm level. [1] L. Reichel et al. JAP 116 (2014) 213901.