La0.67Ca0.33MnO3/NdGaO3(001)薄膜中外延应变诱导的各向异性磁阻效应  

STRAIN-INDUCED ANISOTROPIC MAGNETORESISTANCE IN EPITAXIAL La_(0.67)Ca_(0.33)MnO_3/NdGaO_3(001) FILMS

作　　者：张福恒[1] 王凌飞[1] 黄振[1] 吴文彬[1] 

机构地区：[1]合肥微尺度物质国家实验室,中国科学技术大学,合肥230026

出　　处：《低温物理学报》2011年第3期166-169,共4页Low Temperature Physical Letters

基　　金：国家自然科学基金项目(批准号:10874166和50721061)资助的课题~~

摘　　要：本文使用脉冲激光沉积方法在正交的NdGaO3(001)衬底上外延生长了La0.67Ca0.33MnO3薄膜.退火后,由于外延应变引起薄膜正交畸变增强,薄膜在低于250K的整个温度区间都出现了铁磁金属态和反铁磁绝缘态的相分离和相竞争.这两相的竞争强烈依赖于磁场相对晶轴的方向,由此导致存在于很宽温度范围内的低场各向异性磁阻效应.In this work,La0.67Ca0.33MnO3 films were grown epitaxially on orthorhombic NdGaO3（001） substrates.With an increased orthorhombic lattice distortion because of the anisotropic epitaxial strain,the films show the phase coexistence of FM and antiferromagnetic-insulator below about 250K.The phase competition is found to be very sensitive to the strength of the magnetic field and its orientations with respect to the crystal axes,thus resulting in a large anisotropic magnetoresistance in a wide temperature range.

关 键 词：锰氧化物 各向异性磁阻 脉冲激光沉积 

分 类 号：O484.1[理学—固体物理]