Varying the size and magnetic properties of carbon-encapsulated cobalt particles

被引：57

作者：

Bonard, JM ^{[1
]}

Seraphin, S

Wegrowe, JE

Jiao, J

Châtelain, A

机构：

[1] Ecole Polytech Fed Lausanne, Dept Phys, CH-1015 Lausanne, Switzerland

[2] Univ Arizona, Dept Mat Sci & Engn, Tucson, AZ 85721 USA

来源：

CHEMICAL PHYSICS LETTERS | 2001年 / 343卷 / 3-4期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/S0009-2614(01)00716-3

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：

Carbon-encapsulated cobalt particles were produced by a modified are-discharge technique and subsequently purified with an acid treatment. The arc discharge was realized between a graphite cathode and a graphite crucible with a solid Co target, under partial He pressure with an additional quenching jet. The produced particles are spherical and covered by typically 3-5 graphitic carbon shells. The mean diameter could be varied between 5 and 45 nm by changing the deposition parameters (gas pressure and flow rate of the quenching jet). The magnetic properties were analyzed with a variable temperature SQUID magnetometer. The encapsulated particles showed ferromagnetic hysteresis loops with marked size-dependent properties. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：251 / 257

页数：7

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