Faraday rotation in magnetic gamma-Fe2O3/SiO2 nanocomposites

被引：52

作者：

Guerrero, H ^{[1
]}

Rosa, G ^{[1
]}

Morales, MP ^{[1
]}

delMonte, F ^{[1
]}

Moreno, EM ^{[1
]}

Levy, D ^{[1
]}

delReal, RP ^{[1
]}

Belenguer, T ^{[1
]}

Sema, CJ ^{[1
]}

机构：

[1] CSIC CANTOBLANCO,INST CIENCIA MAT MADRID,MADRID 28049,SPAIN

来源：

APPLIED PHYSICS LETTERS | 1997年 / 71卷 / 18期

关键词：

D O I：

10.1063/1.120181

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Faraday rotation spectrum has been measured at room temperature in a magnetic nanocomposite of gamma-Fe2O3/SiO2. The material consists of isolated gamma-Fe2O3 nanoparticles dispersed in a silica matrix, and it was prepared through a sol-gel method. The composite contains 18% of gamma-Fe2O3 in weight with an average particle size of 20 nm. It has a coercitivity of 30 Oe and an M-S of 6 emu/g. The specific Faraday rotation spectrum exhibits a narrow peak centered around 765 nm, reaching a value of 110 degrees/cm and an absorption coefficient of 64 cm(-1). Faraday rotation versus applied held has also been measured, and a cycle similar to the one described by the magnetization has been found. (C) 1997 American Institute of Physics. [S0003-6951(97)02444-3].

引用

页码：2698 / 2700

页数：3

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