Bistable Magnetoresistance Switching in Exchange-Coupled CoFe2O4-Fe3O4 Binary Nanocrystal Superlattices by Self-Assembly and Thermal Annealing

被引：78

作者：

Chen, Jun ^{[1
]}

Ye, Xingchen ^{[2
]}

Oh, Soong Ju ^{[1
]}

Kikkawa, James M. ^{[3
]}

Kagan, Cherie R. ^{[1
,2
,4
]}

Murray, Christopher B. ^{[1
,2
]}

机构：

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

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

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

[4] Univ Penn, Dept Elect & Syst Engn, Philadelphia, PA 19104 USA

来源：

ACS NANO | 2013年 / 7卷 / 02期

基金：

美国国家科学基金会;

关键词：

binary nanocrystal superlattices; BNSLs; self-assembly; exchange coupling; magnetoresistance; magnetic nanocrystal; MAGNETIC-PROPERTIES; COBALT NANOCRYSTALS; FEPT NANOPARTICLES; ARRAYS; SHAPE; SIZE;

D O I：

10.1021/nn3052617

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Self-assembly of multicomponent nanocrystal superlattices provides a modular approach to the design of metamaterials by choosing constituent nanocrystal building blocks with desired physical properties and engineering the interparticle coupling. In this work, we report the self-assembly of binary nanocrystal superlattices composed of magnetically hard CoFe2O4 nanocrystals and magnetically soft Fe3O4 nanocrystals. Both NaZn13- and MgZn2-type CoFe2O4-Fe3O4 binary nanocrystal superlattices have been formed by the liquid-air interfacial assembly approach. Exchange coupling is achieved in both types of binary superlattices after thermal annealing under vacuum at 400 degrees C. The exchange-coupled CoFe2O4-Fe3O4 binary nanocrystal superlattices show single-phase magnetization switching behavior and magnetoresistance switching behavior below 200 K. The NaZn13-type CoFe2O4-Fe3O4 binary nanocrystal superlattices annealed at 500 degrees C even exhibit bistable magnetoresistance switching behavior at room temperature constituting a simple nonvolatile memory function.

引用

页码：1478 / 1486

页数：9

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