Polarized Hole Injection-induced Magnetic Enhancement in Carbon-Encapsulated Cobalt Ferrite Nanoparticles

doi:10.1021/acs.jpcc.3c03046

淡江大學機構典藏 > 理學院 > 物理學系暨研究所 > 期刊論文 > Item 987654321/125496

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題名:	Polarized Hole Injection-induced Magnetic Enhancement in Carbon-Encapsulated Cobalt Ferrite Nanoparticles
作者:	Jiann-Shing Lee, Shih-Min Hung, Chun-Rong Lin, Chi-Liang Chen, Jau-Wern Chiou, Chih-Yu Hua, Huang-Ming Tsai, Way-Faung Pong, Chien-Te Chen, Wen-Bin Wu, and Jiunn Chen
日期:	2023-08-29
上傳時間:	2024-07-05 12:05:17 (UTC+8)
出版者:	ACS Publications
摘要:	Magnetic enhancement was observed in carbon-encapsulated cobalt ferrite (CoFe2O4) nanoparticles. The induced magnetic moment of the nanoparticles was estimated using a vibrating-sample magnetometer and corrected based on thermogravimetric loss. Notably, up to 25% magnetic enhancement was achieved via carbon encapsulation by low-temperature hydrothermal reactions. A systematic variation on Co L-edge absorption spectra revealed the introduction of valence holes owing to carbon encapsulation, and the hole injection was attributed to carbon–sp contact. X-ray magnetic circular dichroism indicates holes injected upon both Fe and Co ions. Specifically, it is observed that the injection of polarized holes into Co2+ ions at the octahedral site results in magnetic enhancement. A spin–split electronic structure analysis of CoFe2O4 based on density functional theory with Hubbard correction demonstrated that octahedral Co, which served as a minority hole reservoir, controlled the magnetic properties of the hybrid system.
關聯:	The Journal of Physical Chemistry C 127, 36, 17978–17986
DOI:	10.1021/acs.jpcc.3c03046
顯示於類別:	[物理學系暨研究所] 期刊論文

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