A NEW APPROACH FOR CALCULATION OF RELAXATION TIME AND MAGNETIC ANISOTROPY OF FERROFLUIDS CONTAINING SUPERPARMAGNETIC NANOPARTICLES

被引：4

作者：

Ahmadi, R. ^{[1
]}

Hosseini, H. R. Madaah ^{[1
]}

机构：

[1] Sharif Univ Technol, Dept Mat Sci & Engn, Tehran, Iran

来源：

JOURNAL OF MINING AND METALLURGY SECTION B-METALLURGY | 2012年 / 48卷 / 01期

关键词：

relaxation time; magnetic anisotropy; Ferrofluids; magnetite nanoparticles; SIZE DEPENDENCE; PARTICLE-SIZE; FIELD; DELIVERY;

D O I：

10.2298/JMMB110330004A

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

In this work, a new approach is described for the calculation of the relaxation time and magnetic anisotropy energy of magnetic nanoparticles. Ferrofluids containing monodispersed magnetite nanoparticles were synthesized via hydrothermal method and then heated using the 10 kA/m external AC magnetic fields in three different frequencies: 10, 50 and 100 kHz. By measuring the temperature variations during the application of the magnetic field, the total magnetic time constant including both Brownian and Neel relaxation times can be calculated. By measuring the magnetic core size and hydrodynamic size of particles, the magnetic anisotropy can be calculated too. Synthesized ferrofluids were characterized via TEM, XRD, VSM and PCS techniques and the results were used for the mentioned calculations.

引用

收藏

页码：81 / 88

页数：8

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