Enhancement of Magnetic Properties for FePt Nanoparticles by Rapid Annealing in a Vacuum

被引：20
|
作者：
Lu, L. Y. [1 ]
Wang, D. [1 ]
Xu, X. G. [1 ]
Zhan, Y. [1 ]
Jiang, Y. [1 ]
机构：
[1] Univ Sci & Technol Beijing, Sch Mat Sci & Engn, State Key Lab Adv Met & Mat, Beijing 100083, Peoples R China
来源：
JOURNAL OF PHYSICAL CHEMISTRY C | 2009年 / 113卷 / 46期
关键词：
Annealing - Binary alloys - Chlorine compounds - Iron compounds - Nanomagnetics - Association reactions - Coercive force - Synthesis (chemical) - Iron alloys;
D O I：
10.1021/jp9076245
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
FePt nanoparticles with uniform compositions were synthesized by a modified coreduction process of FeCl2 center dot 4H(2)O and Pt(acac)(2) and then rapidly annealed in a vacuum under temperatures ranging from 500 to 700 degrees C. We found that the coercivities of the FePt nanoparticles were greatly enhanced by the rapid annealing in a vacuum. Negative peaks on delta M curves for the annealed FePt nanoparticles demonstrate that the predominant interparticle interactions are dipolar-type rather than exchange coupling ones, which indicates that the rapid annealing in a vacuum can prevent the agglomeration of the nanoparticles. Through the heat treatment of annealing in a vacuum, monodispersed Fe46Pt54 nanoparticles with a high coercivity of 9230 Oe were successfully fabricated.
引用
收藏
页码：19867 / 19870
页数：4
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