Oriented attachment and exchange coupling of alpha-Fe2O3 nanoparticles

Article

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

DOI  :  10.1103/PhysRevB.72.214406

来源: SCIE

【 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.

【 授权许可】

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