Understanding the formation of ultrafine spinel CoFe2O4 nanoplatelets and their magnetic properties

Wenchao Liu, Yukkwan Chan, Jinzhu Cai, Chi Wah Leung, Chee Leung Mak, Kinhung Wong, Fengming Zhang, Xiaoshan Wu, X. D. Qi

Research output: Journal article publicationJournal articleAcademic researchpeer-review

37 Citations (Scopus)

Abstract

Cobalt ferrite (CoFe2O4, CFO) nanoplatelets with a rhomboidal shape were synthesized through a facile hydrothermal route using a very low concentration precursor at low temperatures. The effects of reaction temperature and time on the morphologies as well as the sizes of the products were systemically investigated. The as-synthesized CFO nanocrystals showed a special rhomboidal shape with crystal growth along the (111) direction. The very low concentration precursor plays an important role in forming CFO nanocrystals with such special shape and ultrafine size. The single-phase CFO nanoplatelets synthesized at 180°C with size of 17 nm present high saturation magnetization (79.7 emu/g) and high coercivity (3100 Oe). The preparation conditions have significant effects on the crystal size and shape, magnetization and relaxation activation of the CFO nanoplatelets.
Original languageEnglish
Article number104306
JournalJournal of Applied Physics
Volume112
Issue number10
DOIs
Publication statusPublished - 15 Nov 2012

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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