Oriented attachment and exchange coupling of alpha-Fe2O3 nanoparticles

[摘要] We show that antiferromagnetic nanoparticles of alpha-Fe2O3 (hematite) under wet conditions can attach into chains along a common [001] axis. Electron microscopy shows that such chains typically consist of two to five particles. X-ray and neutron diffraction studies show that both structural and magnetic correlations exist across the interfaces along the [001] direction. This gives direct evidence for exchange coupling between particles. Exchange coupling between nanoparticles can suppress superparamagnetic relaxation and it may play a role for attachment along preferred directions. The relations between exchange coupling, magnetic properties, and oriented attachment are discussed.

[发布日期] 2005-12-01

[关键词] HEMATITE NANOPARTICLES;MOSSBAUER SPECTROMETER;MAGNETIC-PROPERTIES;CRYSTAL-GROWTH;DYNAMICS;SIZE;NANOCRYSTALS;FERROFLUIDS;MICROSCOPY;PARTICLES