Effective particle magnetic moment of multi-core particles

F. Ahrentorp, A. Astalan, J. Blomgren, C. Jonasson, E. Wetterskog, P. Svedlindh, A. Lak, F. Ludwig, L.J. Van IJzendoorn, F. Westphal, C. Grüttner, N. Gehrke, S. Gustafsson, E. Olsson, C. Johansson

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Abstract

In this study we investigate the magnetic behavior of magnetic multi-core particles and the differences in the magnetic properties of multi-core and single-core nanoparticles and correlate the results with the nanostructure of the different particles as determined from transmission electron microscopy (TEM). We also investigate how the effective particle magnetic moment is coupled to the individual moments of the single-domain nanocrystals by using different measurement techniques: DC magnetometry, AC susceptometry, dynamic light scattering and TEM. We have studied two magnetic multi-core particle systems - BNF Starch from Micromod with a median particle diameter of 100 nm and FeraSpin R from nanoPET with a median particle diameter of 70 nm - and one single-core particle system - SHP25 from Ocean NanoTech with a median particle core diameter of 25 nm.

Original languageEnglish
Pages (from-to)221-226
Number of pages6
JournalJournal of Magnetism and Magnetic Materials
Volume380
DOIs
Publication statusPublished - 15 Apr 2015

Keywords

  • Magnetic nanoparticles
  • Magnetic relaxation
  • Multi-core particles
  • Single-core particles

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    Ahrentorp, F., Astalan, A., Blomgren, J., Jonasson, C., Wetterskog, E., Svedlindh, P., Lak, A., Ludwig, F., Van IJzendoorn, L. J., Westphal, F., Grüttner, C., Gehrke, N., Gustafsson, S., Olsson, E., & Johansson, C. (2015). Effective particle magnetic moment of multi-core particles. Journal of Magnetism and Magnetic Materials, 380, 221-226. https://doi.org/10.1016/j.jmmm.2014.09.070