基于新型鼓包法测试NiFe_2O_4薄膜的力磁性能  

Analysis of Mechanical-magnetic Coupling Characteristics of NiFe_2O_4 Thin Film Based on Modified Bulge Tests

作　　者：孙长振 何元东[1] 毛卫国[1] 顾阳[1] 毛贻齐[2] 张宏龙 陈彦飞[3] 裴永茂[3] 方岱宁[4] SUN Changzhen HE Yuandong MAO Weiguo GU Yang MAO Yiqi ZHANG Honglong CHEN Yanfei PEI Yongmao FANG Daining(School of Materials Science and Engineering, Xiangtan University, Xiangtan 411105 College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082 College of Engineering, Peking University, Beijing 100871 Institute of Advanced Structure Technology, Beijing Institute of Technology, Beijing 100081)

机构地区：[1]湘潭大学材料科学与工程学院,湘潭411105 [2]湖南大学机械与运载工程学院,长沙410082 [3]北京大学工学院,北京100871 [4]北京理工大学先进结构技术研究院,北京100081

出　　处：《材料导报》2017年第15期145-148,共4页Materials Reports

基　　金：国家自然科学基金(11272276;11572277;11302004);湖南省自然科学基金杰出青年基金(14JJ1020);国家重大科学仪器设备开发专项(2012YQ03007502)

摘　　要：为表征NiFe_2O_4(NFO)薄膜材料的力磁性能,利用自主研发的新型多场耦合鼓包测试系统和发展的铁磁材料鼓包力磁本构方程,采用溶胶-凝胶法和化学腐蚀法制备了NFO薄膜鼓包样品,并在不同力磁条件下研究了NFO薄膜力磁耦合性能。结果表明,在外加磁场为0Oe时,NFO薄膜弹性模量和残余应力分别为187.8GPa和500.8 MPa。随着外加磁场的增大,NFO薄膜弹性模量由0Oe时的187.8GPa逐渐增大到800Oe时的484.6GPa;磁致伸缩系数由200Oe时的-94.2×10^(-6)增大到800Oe时的-326.2×10^(-6)。当鼓包油压由0kPa增大到50kPa时,NFO薄膜剩余磁化强度降低75%,矫顽磁场降低44%。A modified multiple functional bulge apparatus andbulge mechanical-magnetic constitutive equation were introduced to study the mechanical-magnetic characteristics of NiFe_2O_4（NFO）film materials.NFO thin film bulge samples were prepared by sol-gel and chemical etching methods.Magneto-mechanical characteristics of NFO thin film were studied under different mechanical and magnetic loads.The results show that residual stress and elastic modulus of NFO thin films were about 500.8 MPa and 187.8GPa,respectively,under no external magnetic field state.As the magnetic field increased from 0Oe to 800 Oe,the elastic modulus increased from 187.8GPa to 484.6GPa.The corresponding magnetostriction coefficient varies from-94.2×10^-6 to-326.2×10^-6 with the increase of applied magnetic fields from 200 Oe to 800 Oe.When the bulge oil pressure changes from 0kPa to 50 kPa,the residual polarization of NFO film decreased by 75% and the coercive field decreased by 44%.

关 键 词：铁磁薄膜 鼓包测试 弹性模量 残余应力 磁致伸缩系数 

分 类 号：O341[理学—固体力学]