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Berlin 2005 – scientific programme

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MA: Magnetismus

MA 7: Magnetische dünne Schichten II

MA 7.1: Talk

Friday, March 4, 2005, 15:15–15:30, TU H1012

Fully oriented Nd-Fe-B films grown on MgO(100) substrates — •Ah-Ram Kwon, Ullrich Hannemann, Sebastian Fähler, Volker Neu, Bernhard Holzapfel, and Ludwig Schultz — IFW Dresden, Helmholtzstr. 20, 01069 Dresden and SFB 463

For both, applications and the study of their anisotropic intrinsic properties, well textured Nd2Fe14B film are required. This can be achieved by epitaxial film growth, which is controlled by a suitable choice of buffer and substrate materials as well as deposition conditions. Nd-Fe-B films were prepared by pulsed laser deposition on Ta buffer layer using different substrates: amorphous SiN, Al2O3 (0001) and MgO(100) substrates in order to control the texture in the films. On all substrates, Nd-Fe-B films possess an out-of-plane c-axis texture with a high remanence to saturation magnetization ratio of around 0.95 and high coercivities between 1.3 T and 2.0 T. However, whereas films on SiN grow with a fiber texture, the films on MgO(100) have a single in-plane orientation of the NdFeB crystallites, growing epitaxially on the substrate. A detailed comparison of microstructure and magnetic properties is presented together with in-plane anisotropy measurements of these films through the spin reorientation transition.

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