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单一晶相氧化锰纳米颗粒的交换偏置效应：
  • ISSN号：1000-3290
  • 期刊名称：《物理学报》
  • 时间：0
  • 分类：TM271[电气工程—电工理论与新技术;一般工业技术—材料科学与工程]
  • 作者机构：[1]四川范大学物理与电子工程学院和固体物理研究所,成都610068, [2]中国科学院物理研究所磁学国家重点实验室,北京100190
  • 相关基金：国家自然科学基金（批准号：51071173,11274370,50931006,11074179）、科技部项目（批准号：2012CB933102,2011CB921801,2010CB934202）和四川高校科研创新团队建设计划（批准号：12TD008）资助的课题.
作者： 罗毅[1,2], 赵国平[1,2], 杨海涛[2], 宋宁宁[2], 任肖[2], 丁浩峰[2], 成昭华[2]
关键词： 纳米颗粒, 氧化锰, 交换偏置, 自旋玻璃, nanoparticles, MnO, exchange bias, spin glass
中文摘要：

本文利用高温油相法制备出尺寸、形状均一的MnO纳米颗粒，x射线衍射图（XRD）和透射电子显微镜（TEM）照片清晰表明MnO纳米颗粒为单一的面心立方岩盐晶体结构，尺寸为15nm，粒径分布很窄．通过零场冷却（ZFC）和带场冷却（FC）的磁滞回线发现MnO纳米颗粒具有明显的交换偏置效应，而且磁滞回线同时表现出横向和纵向偏移．横向偏移说明纳米颗粒中两相复合的存在，纵向偏移说明了存在自旋玻璃相或者超顺磁相．进而通过不同频率下随温度变化的交流磁化率的测定，根据Mydosh的经验数值确认MnO纳米颗粒表面层为自旋玻璃相，并得到MnO纳米颗粒表面自旋玻璃相的转变温度为TsG=32K．

英文摘要：

The MnO nanoparticles with uniform size （,-~ 15 nm） and shape have been synthesized in an inert atmosphers by high-temperature oil phase method. XRD patterns and HRTEM reveals that the as-synthesized MnO nanoparticles are of pure crystalline phase. TEM image shows that the MnO nanoparticles are in spherical shape with a narrow size distribution. Both oil phase and the nanoparticles protected with inert gas in the synthesis process can avoid the oxidization of Mn2＋. The obvious exchange bias effect can be observed from the M-H loop of MnO nanoparticles under zero field cooling （ZFC） and FC measurements. Furthermore, the temperature- dependent AC susceptibility of the MnO nanoparticles reveals that the exchange bias effect originates from the antiferromagnetic MnO core and the spin-glass surface, rather than the superparamagnefic phase.

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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