Dresden 2011 – scientific programme

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MA: Fachverband Magnetismus

MA 32: Magnetic Thin Films I

MA 32.1: Talk

Wednesday, March 16, 2011, 11:00–11:15, HSZ 04

Remanence enhanced high-energy density in epitaxial exchange-coupled SmCo₅/Fe/SmCo₅-trilayers — •Simon Sawatzki¹, Rene Heller², Christine Mickel¹, Marietta Seifert¹, Ludwig Schultz¹, and Volker Neu¹ — ¹IFW Dresden, Institute for Metallic Materials, PO Box 270116, D-01171 Germany — ²Helmholtz-Zentrum Dresden Rossendorf, Germany

In order to enhance the energy density (BH)_max, as a key property for permanent magnet applications, exchanged-coupled trilayers of SmCo₅/Fe/SmCo₅ with fixed SmCo₅ layer thicknesses (25 nm) and varying soft magnetic Fe film thickness have been epitaxially grown by pulsed laser deposition on Cr buffered MgO(110) substrates. The realization of one single in-plane easy axis of the highly anisotropic SmCo₅ phase through the whole layer stack as well as phase formation and texture could be confirmed by Bragg-Brentano X-ray diffraction and pole figure measurements. The effect of the increasing soft layer thickness on the reversal mechanism and improved remanence due to the higher Fe-volume fraction was investigated by vibrating sample magnetometer measurements with external fields up to 9 T. As the energy density strongly depends on the volume of the samples, emphasize is put on multilayer architecture investigation and reliable thickness determination. Concerning the latter all applied analysis methods as energy dispersive X-ray analysis, Rutherford backscattering spectroscopy and transmission electron microscopy confirm energy densities with maximum values of 312 kJ/m³ (39 MGOe).