Dresden 2009 – scientific programme

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MA: Fachverband Magnetismus

MA 40: Poster II: Bio- and Molecular Magnetism (1-9); Magnetic Coupling Phenomena/Exchange Bias (10-15); Magnetic Particlicles and Clusters (16-29); Micro and Nanostructured Magnetic Materials (30-51); Multiferroics (52-64); Spin Injection in Heterostructures (65-67); Spin-Dyn./Spin-Torque (68-93); Spindependent Transport (94-108)

MA 40.108: Poster

Friday, March 27, 2009, 11:00–14:00, P1A

Magnetic properties of Co₂FeSi thin films deposited by magnetron sputtering using different target compositions — •Daniel Ebke, Jan Schmalhorst, Andy Thomas, Andreas Hütten, and Günter Reiss — Bielefeld University, Thin Films and Physics of Nanostructures, D-33615 Bielefeld, Germany

The Heusler alloy Co₂FeSi is predicted to show 100% spin polarization at the Fermi energy E_F and a high magnetic moment of 6µB as well as a high Curie temperature of 1100K [1]. Therefore it is a promising material for spintronic applications. In experiments a lower spin polarization and a lower magnetic moment are reported by different groups [2,3].

Sputtered thin films from stoichiometrical targets show off-stoichiometrical layers which might be the reason for lowering the spin polarization of the Heusler alloy. However, a correct film composition is required to enhance the spin polarization and so the tunneling magneto resistance (TMR) ratio.

We have studied the growth conditions and the magnetic properties of Co₂FeSi thin films which were deposited by using different target compositions. The electrical transport properties were investigated and will be discussed in combination with the magnetic properties and XRD measurements.

[1] S. Wurmehl et al., Phys. Rev. B, 72, 184434 (2005)

[2] Z. Gercsi et al., Appl. Phys. Lett., 89, 082512 (2006)

[3] T. Daibou et al., IEEE Trans. on Magn., 42, 2655-2657 (2006)