Enhancement of magnetic properties through morphology control of SrFe12O19 nanocrystallites

Anna Zink Eikeland, Marian Stingaciu, Aref Hasen Mamakhel, Matilde Saura-Múzquiz, Mogens Christensen*

*Corresponding author af dette arbejde

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Abstract

Nanocrystallites of the permanent magnetic material SrFe12O19 were synthesised using a conventional sol-gel (CSG) and a modified sol-gel (MSG) synthesis route. In the MSG synthesis, crystallite growth takes place in a solid NaCl matrix, resulting in freestanding nanocrystallites, as opposed to the CSG synthesis, where the produced nanocrystals are strongly intergrown. The resulting nanocrystallites from both methods exhibit similar intrinsic magnetic properties, but significantly different morphology and degree of aggregation. The nanocrystallites were compacted into dense pellets using a Spark Plasma Sintering (SPS) press, this allows investigating the influence of crystallite morphology and the alignment of the nanocrystallites on the magnetic performance. A remarkable correlation was observed between the crystallites morphology and their ability to align in the compaction process. Consequently, a significant enhancement of the maximum energy product was obtained after SPS for the MSG prepared sample (22.0 kJ/m3), compared to CSG sample, which achieved an energy product of 11.6 kJ/m3.

OriginalsprogEngelsk
Artikelnummer7325
TidsskriftScientific Reports
Vol/bind8
Nummer1
Antal sider9
ISSN2045-2322
DOI
StatusUdgivet - 1 dec. 2018

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