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Strategy to control magnetic coercivity by elucidating crystallization pathway-dependent microstructural evolution of magnetite mesocrystals

Authors
Park, Bum ChulCho, JiungKim, Myeong SooKo, Min JunPan, LijunNa, Jin YeongKim, Young Keun
Issue Date
15-1월-2020
Publisher
NATURE PUBLISHING GROUP
Citation
NATURE COMMUNICATIONS, v.11, no.1
Indexed
SCIE
SCOPUS
Journal Title
NATURE COMMUNICATIONS
Volume
11
Number
1
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/58301
DOI
10.1038/s41467-019-14168-0
ISSN
2041-1723
Abstract
Mesocrystals are assemblies of smaller crystallites and have attracted attention because of their nonclassical crystallization pathway and emerging collective functionalities. Understanding the mesocrystal crystallization mechanism in chemical routes is essential for precise control of size and microstructure, which influence the function of mesocrystals. However, microstructure evolution from the nucleus stage through various crystallization pathways remains unclear. We propose a unified model on the basis of the observation of two crystallization pathways, with different ferric (oxyhydr)oxide polymorphs appearing as intermediates, producing microstructures of magnetite mesocrystal via different mechanisms. An understanding of the crystallization mechanism enables independent chemical control of the mesocrystal diameter and crystallite size, as manifested by a series of magnetic coercivity measurements. We successfully implement an experimental model system that exhibits a universal crystallite size effect on the magnetic coercivity of mesocrystals. These findings provide a general approach to controlling the microstructure through crystallization pathway selection, thus providing a strategy for controlling magnetic coercivity in magnetite systems.
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공과대학 (신소재공학부)
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