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.