Figure 4.

Neutron diffraction data for interacting 8 nm α-Fe₂O₃ particles obtained at 20 K. The inset shows a TEM image of three α-Fe₂O₃ particles attached along their common [001] axis. The antiferromagnetic order is indicated by the blue and red arrows superimposed on the TEM image. Adapted from Frandsen, C.; Bahl, C. R. H.; Lebech, B.; Lefmann, K.; Kuhn, L. T.; Keller, L.; Andersen, N. H.; von Zimmermann, M.; Johnson, E.; Klausen, S. N.; Mørup, S. Oriented attachment and exchange coupling of α-Fe₂O₃ nanoparticles, Phys. Rev. B 2005, 72, 214406. Copyright (2005) by the American Physical Society.