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KR: Fachverband Kristallographie

KR 10: Poster: Multiferroics (with MA, DF, KR, DS)

KR 10.40: Poster

Dienstag, 23. März 2010, 10:45–13:45, Poster A

Epitaxial NdCo₅/SmCo₅ bilayers — •Marietta Seifert, Ludwig Schultz, and Volker Neu — IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany

RECo₅ magnets are of interest due to their strong magnetocrystalline anisotropies, which in some cases change with temperature. This work presents epitaxial NdCo₅/SmCo₅ bilayers, in which NdCo₅ undergoes a spin reorientation transition from easy axis along the c-axis above 310 K to easy plane below 255 K while SmCo₅ keeps the uniaxial anisotropy in the whole temperature range. The films were prepared on Cr buffered MgO(110) substrates resulting in a growth of the RECo₅ with a single orientation of the c-axis parallel to the film plane. In a first step, the magnetic behavior of single NdCo₅ thin films have been investigated and it was found that they possess intrinsic magnetic properties and especially a spin reorientation transition in good agreement with single crystal data. To analyze the magnetic coupling of the bilayer system, a series with a fixed thickness of the SmCo₅ layer and a varying thickness of the NdCo₅ have been prepared. Phase formation and texture were controlled with XRD and texture measurements. The magnetic properties in a temperature range between 20 and 400 K have been measured with Vibrating Sample Magnetometry.