Enhanced Thermal Stability and Magnetic Properties in NaCl-Type FePt-MnO Binary Nanocrystal Superlattices

被引：57

作者：

Dong, Angang ^{[1
]}

Chen, Jun ^{[2
]}

Ye, Xingchen ^{[3
]}

Kikkawa, James M. ^{[4
]}

Murray, Christopher B. ^{[2
,3
]}

机构：

[1] Univ Calif Berkeley, Lawrence Berkeley Lab, Mol Foundry, Berkeley, CA 94720 USA

[2] Univ Penn, Dept Mat Sci & Engn, Philadelphia, PA 19104 USA

[3] Univ Penn, Dept Chem, Philadelphia, PA 19104 USA

[4] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 34期

基金：

美国国家科学基金会;

关键词：

ORDERING TEMPERATURE; NANOPARTICLES; REDUCTION; MEDIA; MEMBRANES; PHASE;

D O I：

10.1021/ja2057314

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the growth of NaCl-type binary nanocrystal (NC) superlattice membranes by coassembly of FePt and MnO NCs at the liquid-air interface. The constituent FePt NCs were converted into the hard magnetic L1(0) phase by thermal annealing at 650 degrees C without degradation of the long-range NC ordering. In contrast, both FePt-only NC superlattices and FePt-MnO disordered NC mixtures showed substantial FePt sintering under the same annealing conditions. Our results demonstrate that the incorporation of FePt NCs into binary superlattices can solve the problems of FePt sintering during conversion to the L1(0) phase, opening a new route to the fabrication of ordered ferromagnetic NC arrays on a desired substrate for high-density data storage applications.

引用

页码：13296 / 13299

页数：4

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