Regensburg 2016 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Poster Session I

MA 17.87: Poster

Dienstag, 8. März 2016, 09:30–12:30, Poster B1

Synthesis and magnetic properties of SrAl₂Fe₁₀O₁₉/α^′′-Fe₁₆N₂ nanocomposites — •Imants Dirba¹, Fabian Rhein^{1, 2}, and Oliver Gutfleisch¹ — ¹Materials Science, Technische Universität Darmstadt, 64287 Darmstadt, Germany — ²Siemens AG, Corporate Technology, 80200 Muenchen, Germany

Despite the superior magnetic properties of Nd-Fe-B, hard ferrites still dominate global permanent magnet market (in terms of tonnage) due to their low price combined with moderate magnetic performance. In this context, even a slight improvement in magnetic properties without significantly added cost would be of great importance. Here we report an attempt to increase the maximum energy product (BH)_max of SrAl₂Fe₁₀O₁₉ hexaferrite by exchange-coupling on nanoscale with a phase with higher polarisation. Nanocomposites from SrAl₂Fe₁₀O₁₉ as a hard and α^′′-Fe₁₆N₂ as a soft (semihard) phase have been synthesized. Morphology, structural and magnetic properties have been investigated in order to optimize synthesis conditions and achieve exchange-coupling between both phases.