Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)

MA 63.28: Poster

Freitag, 18. März 2011, 11:00–14:00, P2

Ultrathin continuous CoPt films with perpendicular anisotropy — •Ludwig Reichel, Karin Leistner, Sebastian Fähler, and Ludwig Schultz — IFW Dresden, PF 270116, 01171 Dresden

The change of magnetic properties of ferromagnetic ultrathin films by an electric field would be an easy and fast way to control their behaviour in nanosized devices. Among the ordered L10 phases, DFT calculations [1] predict the highest E-field induced change of anisotropy for the CoPt phase. Experimentally, the application of the electric field can be achieved by using a film as electrode in an electrochemical cell. For this, continuous, conducting films are required.

In the present investigation, 2-10 nm thick continuous CoPt films were deposited by pulsed laser deposition on MgO(001) substrates with Cr and Pt(001) buffer layers. Magnetic hysteresis curves with the magnetic field applied perpendicular to the film plane were obtained by anomalous Hall effect measurements. For films deposited at low temperatures, the A1 CoPt phase is present and shape anisotropy in the film plane dominates. On the other hand, temperatures above 500°C lead to interdiffusion and a lower degree of texture. Optimum (001)-textured L10 phase formation occurs for deposition temperatures of 450°C to 500°C. In these films, perpendicular anisotropy and switching of magnetization is achieved. We will present first results on electrolyte-CoPt interactions and electrolytic charging of these films.

[1] Zhang et al.: New J. Phys. 11 (2009) 043007