位置：成果数据库 > 期刊 > 期刊详情页
磁场下合成Fe3O4粉体的隧道磁阻
  • ISSN号：1000-3290
  • 期刊名称：《物理学报》
  • 时间：0
  • 分类：TM274[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] TB39[一般工业技术—材料科学与工程]
  • 作者机构：[1]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001, [2]中国科学院长春应用化学研究所稀土化学与物理重点实验室,长春130022
  • 相关基金：国家自然科学基金（批准号：20331030）资助的课题.
作者： 王敬平[1], 孟健[2]
关键词： 磁阻, 隧穿, 表面, 晶格缺陷, magnetoresistance, tunneling, surface, defect
中文摘要：

通过在半金属Fe3O4合成过程中外加磁场的方法,改变样品粒子的表面结晶状态和晶格缺陷,研究了由此引起的Fe3O4输运性质的变化.合成的Fe3O4粉体的主要导电机理均为自旋极化隧穿和高阶跃迁电导,电阻随温度升高成指数降低,电阻与电压显示了非线形相关性,磁阻与磁场的关系为蝴蝶形,是典型的隧道磁阻特征.与没有外加磁场时合成的样品比较,外加磁场合成的样品显示了更低的电阻和更高的磁阻.由于Fe3O4具有高的居里温度,引起Fe3O4粉体的磁阻随温度升高而降低缓慢.

英文摘要：

The magnetite particles were prepared in magnetic field in order to improve the surface crystallinity and reduce the lattice defests of particles. The magnetotransport properties of as-prepared magnetite compact were investigated and compared with that prepared without magnetic field. Spin polarization tunneling and high order hopping conductance were the main conduct mechanisms. The resistance decreased almost exponentially with increasing temperature, and was noncollinearity dependent on the voltage. Magnetoresistance vs magnetic field curves were butterfly-like, which was characteristic of tunneling magnetoresistance. The results showed that the sample prepared in magnetic field had lower resistance and higher magnetoresistance, maybe due to the particles having better crystallinty in the surface and less lattice defect. Magnetoresistance of both samples decreased slowly with increasing temperature.

同期刊论文项目
过渡金属化合物的合成及其特殊性质的研究
期刊论文 123 会议论文 4
同项目期刊论文
Low temperature and hard mater
First-Principles Study on Diff
先驱体合成法制备PMN-PT弛豫铁电
水热法合成负热膨胀材料ZrW2O8
Grain boundary conductivity of
The improvement of low magneto
An investigation of low-field
Phase Behavior of BaLn2Mn2O7 (
Electrical Properties and Dila
Electron affinities and ioniza
Influence of Mn-O-Mn bond angl
Phase Behavior of Rare Earth M
Density functional study of Au
A novel organically templated
铅基弛豫铁电体陶瓷材料PMN-PT制
Magnetic and electronic proper
新型固体电解质Ce6-xSmxMoO15-y
Chemical bonding and electroni
Enhanced Thermal Stability of
Electronic structures of 4d tr
Theoretical study of transitio
Ferrimagnetic and half-metalli
Electronic structures of MCO (
Electronic structures of Al2W,
Cation?Ordering?in?the?Microwa
Neutron?diffraction?studies?of
Thermodynamic Properties of La
Density functional study of 3d
溶胶-凝胶法合成钛酸锌陶瓷粉体
Sol-gel synthesis of LaMO3 (M
Interaction of H2 with transit
Synthesis?and?Characterization
Geometries and electronic prop
Structural investigations on f
Density functional studies of
Molten Salt Synthesis of Lead
Nanocrystalline La2Mo2O9 and I
Electronic structures of 5d tr
熔盐法合成PbTiO3粉体及表征
High spontaneous polarization
Morphology controlled synthesi
A?Rapid?Synthesis?of?Multiferr
Hydrothermal?synthesis?of?sing
Tunable Synthesis, Growth Mech
Orbital ordering in Cs2AgF4 fr
4Trends in elasticity and elec
Facile?Alcohothermal?Synthesis
Crystal structure of microwave
Elastic and electronic propert
Geometries and electronic stru
Synthesis?of?Pr-doped?Ceria?Na
Structures and elastic propert
Electronic structures and chem
Density functional study of la
Nano-crystalline Synthesis and
Phase Evolution of Barium Tita
Thermal expansions of ceramics
Theoretical investigation of 5
A New Oxide Ion Conductor: La3
Facile Preparation of ZnTiO3 C
(Zn,M)TiO3(M=Co,Ni,Co0.5Ni0.5)
First principles comparative s
Charge ordering induced metal-
The magnetic and structure pro
Effect of Ti doping on magneti
Thermal expansion of lattice p
铁电陶瓷Pb1-xLaxTiO3的热膨胀性
Single Crystal growth of ZrW2O
Electronic structures of 3d-me
Electronic structures of hafni
Structural stability and elect
Thermal Expansion Properties o
Facile synthesis and photolumi
Study on Structure and oxide i
Ground state of lutetium dimer
Crystal structures and elastic
A New Family of Ce6MoO15 as fa
First-principles comparative s
a large low-field tunneling ma
Morphology-Controllable Synthe
Electronic properties of rheni
Magnetic properties and micros
Morphological Control and Lumi
Low-Temperature Synthe1sis and
Structure and Negative Thermal
Synthesis and thermoelectric p
熔盐法合成PbTiO3粉体及其表征
Pr掺杂对Ce5.2Sm0.8MoO15-δ晶界及电性能的影响
Mo掺杂对高纯Ce1-xNdxO2-x/2（x=0.10,0.15）体系烧结温度及晶界电性能的影响
Sm，Pr掺杂CeO2和CeMoO15基固体电解质的结构与性能
新型氧离子导体La1.84R0.16Mo1.7W0.3O8.92（R=Ca^2＋、Sr^2＋、Ba^2＋）的制备及其电性能
Mn和Fe掺杂SnO2的水热合成与磁结构研究
熔盐快速合成Pb1-xLaxTiO3粉体
熔盐法合成LiTaO3粉体
稀土Dy^3＋掺杂Fe3O4的合成及电磁性质
新型固体电解质Ce5．2RE0．8MoO15-δ的合成及电性质
晶体结构对化合物电学性质的影响
（Zn，M）TiO3（M=Co，Ni，Co0．5Ni0．5）固溶体的溶胶-凝胶法合成
A New Oxide Ion Conductor： La3GaMo2O12
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
  • 国内外数据库收录:
  • 美国化学文摘（网络版）,荷兰文摘与引文数据库,美国工程索引,美国科学引文索引（扩展库）,英国科学文摘数据库,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊（2004版）,中国北大核心期刊（2008版）,中国北大核心期刊（2011版）,中国北大核心期刊（2014版）,中国北大核心期刊（2000版）
  • 被引量:49876