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MA: Fachverband Magnetismus

MA 11: Magnetic Thin Films I

MA 11.4: Talk

Monday, March 7, 2016, 15:45–16:00, H33

c-axis oriented MnBi thin Films with high anisotropy grown from a stoichiometric Mn₅₅Bi₄₅ target — •Sareh Sabet, Erwin Hildebrandt, and Lambert Alff — Institute of Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany

There is an increased interest in the intermetallic compound MnBi as rare-earth free permanent magnet candidate to be used in magneto-optical memory applications as well as the hard magnetic component in an exchange spring magnet. The usual approach for the growth of MnBi thin films is stacking of individual Mn and Bi layers. Here, we report the synthesis of fully c-axis oriented MnBi thin films with high anisotropy from a single target with Mn₅₅Bi₄₅ (at. %) composition. The films were grown by DC magnetron sputtering at room temperature onto quartz glass substrates. The ferromagnetic low-temperature phase (LTP) was formed by a subsequent in-situ annealing step in vacuum. The out-of-plane and in-plane coercivity increases as expected with temperature and reaches 12 kOe and 14 kOe at 300 K, respectively. The maximum saturation magnetization is about 600 emu/cm³. We have estimated a lower bound for the uniaxial anisotropy to be around 1·10⁷ erg/cm³.