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CoFe2O4和MnFe2O4纳米复合介质的制备及其磁性研究
  • ISSN号：1000-3290
  • 期刊名称：物理学报
  • 时间：0
  • 页码：-
  • 分类：O482.4[理学—固体物理;理学—物理]
  • 作者机构：[1]武汉大学物理科学与技术学院,人工微纳结构教育部重点实验室,武汉430072
  • 相关基金：国家自然科学基金（批准号：10974148,61106005,51172166）资助的课题.
  • 相关项目：新型Spinel轨道有序MgTi2O4和电荷有序LiRh2O4体系相变和输运性质的比较研究
作者： 高若瑞|喻伟|费春龙|张悦|熊锐|石兢|
关键词： 热分解法, 软-硬磁交换弹性耦合效应, 表面自旋冻结效应, henkel, thermal decomposition, soft-hard magnet exchange-spring effect, freezing effect of surface spins,Henkel
中文摘要：

采用热分解法制备了分散程度高且平均晶粒尺寸为20nm的CoFe2O4和MnFe2O4复合介质．低温磁化曲线测量显示，制备的复合介质具有软．硬磁交换弹性耦合效应，且合成温度以及软磁和硬磁相的成分比例对磁交换弹性耦合的强度有很大的影响．变温磁测量显示，温度为20K时，复合纳米介质的表面自旋冻结效应导致饱和磁化强度显著增加．Henkel测量显示，对分散的CoFe2O4和MnFe2O4复合介质，磁偶极相互作用占主导作用．

英文摘要：

Highly dispersed granular nano-composite material of CoFe2O4 and MnFe2O4 with an average size of 20 nm is synthesized through thermal decomposition. The soft-hard magnet exchange-spring effect is observed in magnetization measurements at low temperatures, and is found to be strongly affected by the temperature of the reaction and the composition ratio between soft and hard magnetic phases. Magnetization measurements at different temperatures show that at 20 K, the saturation magnetization increases significantly, which is attributed to the freezing of the spin-glass like state at the surface of the nano-composite material. A Henkel Plot measurement on our sample shows that for the dispersed composite material of CoFe2O4 and MnFe2O4, the dipole interaction is dominant among magnetic interactions.

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期刊信息
  • 《物理学报》
  • 北大核心期刊（2011版）
  • 主管单位:中国科学院
  • 主办单位:中国物理学会 中国科学院物理研究所
  • 主编：欧阳钟灿
  • 地址：北京603信箱(中国科学院物理研究所)
  • 邮编：100190
  • 邮箱：apsoffice@iphy.ac.cn
  • 电话：010-82649026
  • 国际标准刊号：ISSN：1000-3290
  • 国内统一刊号：ISSN：11-1958/O4
  • 邮发代号:2-425
  • 获奖情况:
  • 1999年首届国家期刊奖,2000年中科院优秀期刊特等奖,2001年科技期刊最高方阵队双高期刊居中国期刊第12位
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  • 被引量:49876