The effect of matrix and substrate on the coercivity and blocking temperature of self-assembled Ni nanoparticles

被引：10

作者：

Abiade, Jeremiah T. ^{[1
,2
]}

Oh, Sang Ho ^{[3
]}

Kumar, Dhananjay ^{[4
,5
,6
]}

Varela, Maria ^{[6
]}

Pennycook, Stephen ^{[6
]}

Guo, Haizhong ^{[7
,8
,9
]}

Gupta, Arunava ^{[7
,8
,9
]}

Sankar, Jagannathan ^{[4
,5
]}

机构：

[1] Virginia Polytech Inst & State Univ, LORE, Dept Mat Sci & Engn, Blacksburg, VA 24061 USA

[2] Virginia Polytech Inst & State Univ, Dept Mech Engn, Blacksburg, VA 24061 USA

[3] Korea Basic Sci Inst, Div Electron Microscop Res, Taejon 305333, South Korea

[4] N Carolina Agr & Tech State Univ, Dept Mech & Chem Engn, Greensboro, NC 27411 USA

[5] N Carolina Agr & Tech State Univ, CAMSS, Greensboro, NC 27411 USA

[6] Oak Ridge Natl Lab, Condensed Matter Sci Div, Oak Ridge, TN 37831 USA

[7] Univ Alabama, Dept Chem, Tuscaloosa, AL 35487 USA

[8] Univ Alabama, Dept Chem Engn, Tuscaloosa, AL 35487 USA

[9] Univ Alabama, Ctr Mat Informat Technol MINT, Tuscaloosa, AL 35487 USA

来源：

JOURNAL OF APPLIED PHYSICS | 2008年 / 104卷 / 07期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1063/1.2992528

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have shown that the magnetic properties of nanoparticles may be tuned from superparamagnetic to ferromagnetic by changing the substrate or thin film matrix in which they are embedded. Nickel nanoparticles were embedded into alumina, titanium nitride, and cerium oxide matrices on both silicon and sapphire substrates via pulsed laser deposition. The laser ablation time on the nickel target was kept constant. Only nickel nanoparticles in cerium oxide showed characteristics of ferromagnetism (room temperature coercivity and remanence). Ni nanoparticles, in either alumina or titanium nitride, possessed blocking temperatures below 200 K. Detailed scanning transmission electron microscopy analysis has been conducted on the samples embedded into cerium oxide on both substrates and related to the magnetic data. (c) 2008 American Institute of Physics.

引用

页数：6

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