Superparamagnetism and coercivity in HCP-Co nanoparticles dispersed in silica matrix

被引：11

作者：

de Julian Fernandez, C.

Mattei, G.

Sangregorio, C.

Battaglin, C.

Gatteschi, D.

Mazzoldi, P.

机构：

[1] Univ Padua, INFM, Dipartimento Fis, I-35131 Padua, Italy

[2] Univ Florence, INSTM, Dipartimento Chim, I-50019 Sesto Fiorentino, Italy

[3] Univ Venice, INFM, Dipartimento Chim Fis, I-30123 Venice, Italy

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2004年 / 272卷

关键词：

nanoparticles; cobalt; superparamagnetism; coercitivity; ion-implantation;

D O I：

10.1016/j.jmmm.2003.12.1111

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic properties of Co HCP nanoparticles dispersed in a silica matrix with sizes between 270: 7 and 5 +/- 2.2 nm were investigated. The temperature dependence of zero-field cooled and field cooled magnetizations and of the coercive field were analyzed considering the thermal activated demagnetization process. Enhanced anisotropy was observed for the 2 nm nanoparticles, while the demagnetization process of the larger ones is dominated by interparticle interactions. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：E1235 / E1236

页数：2

共 6 条

[1]

BARNIER Y, 1961, CR HEBD ACAD SCI, V252, P2839

[2] Cobalt nanoclusters in silica glass: Nonlinear optical and magnetic properties [J].

Cattaruzza, E ;

Gonella, F ;

Mattei, G ;

Mazzoldi, P ;

Gatteschi, D ;

Sangregorio, C ;

Falconieri, M ;

Salvetti, G ;

Battaglin, G .

APPLIED PHYSICS LETTERS, 1998, 73 (09) :1176-1178

[3]

Dormann JL, 1997, ADV CHEM PHYS, V98, P283, DOI 10.1002/9780470141571.ch4

[4] Magnetic nanoparticles [J].

Kodama, RH .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 200 (1-3) :359-372

[5]

MATTEI G, IN PRESS, P1202

[6] Nonmonotonic field dependence of the zero-field cooled magnetization peak in some systems of magnetic nanoparticles [J].

Sappey, R ;

Vincent, E ;

Hadacek, N ;

Chaput, F ;

Boilot, JP ;

Zins, D .

PHYSICAL REVIEW B, 1997, 56 (22) :14551-14559

← 1 →