电流导致的La0
67Sr0
33MnO3外延薄膜电致电阻效应[EB/OL]
北京：中国科技论文在线
发现20nm和70nm的薄膜表现出负的电致电阻效应
100nm的薄膜在9mA的电流下表现出异常的正电致电阻
Zhu Meihong 1, （ 1、 Department of Physics, Tsinghua University
电致电阻
） 摘要： 我们研究了不同厚度La0
67Sr0
33MnO3外延薄膜在不同电流下的输运性质
Zhang Xiaoping 1,
） Abstract： The electronic transport behavior of La0
67Sr0
33MnO3 epitaxial thin films with different thicknesses has been investigated under various applied dc currents
The 20 and 70 nm thick films show a giant negative electroresistance (ER)
In contrast, the films with 100 nm thickness show unusual giant positive ER, which can reach 30% with the current density of 1
8×108 A/cm2 at room temperature
It is interesting that the electric current can also change the magnetoresistance of the films
The results were explained by considering the spin polarized current induced increase of ferromagnetic metallic phase and current-induced lattice distortion via electron wind force under high current density
