MOSSBAUER SPECTROSCOPIC CHARACTERIZATION OF MANGANESE AND COBALT FERRITE FERROFLUIDS

被引：17

作者：

RECHENBERG, HR

TOURINHO, FA

机构：

[1] Instituto de Física, Universidade de São Paulo, São Paulo, 01498

来源：

HYPERFINE INTERACTIONS | 1991年 / 67卷 / 1-4期

关键词：

D O I：

10.1007/BF02398211

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

Aqueous ferrofluids based on Mn and Co ferrites have been synthesized by a novel method. Mossbauer spectra of dried samples (average particle diameter almost-equal-to 10 nm) were measured in the 77-340 K temperature range. CoFe2O4 spectra show no superparamagnetic (SP) relaxation, in accordance with the high magnetic anisotropy of this compound. MnFe2O4 spectra exhibit SP relaxation, from which an effective K = (8 +/- 3) x 10(4) J/m3 is estimated. This value represents a 20 x enhancement over intrinsic magnetocrystalline anisotropy.

引用

页码：627 / 631

页数：5

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