%0 Journal Article
%T Low-field positive and high-field negative magneto-resistances in multiphase Fe-oxide thin films at room temperature<br>Low-field positive and high-field negative magnetoresistances in multiphase Fe-oxide thin films at room temperature
%A ZHAO KUN
%A XING JIE LIU YUZI ZHAO JIAN-GAO LU HUIBIN
%A <br>ZHAO
%A Kun
%A XING
%A Jie
%A LIU
%A YuZi
%A ZHAO
%A JianGao
%A LU
%A HuiBin
%J 科学通报(英文版)
%D 2007
%I 
%X Multiphase Fe-oxide thin films are fabricated on glass substrates by a facing-target sputtering technique. X-ray diffraction and X-ray photoelectron spectroscopy reveal that Fe, Fe3O4, γ-Fe2O3 and FeO coexist in the films. High resolution transmission electron microscopy shows the well-defined columnar grain structure with the unoxidized Fe as the core and iron-oxide as the shell. The low-field positive and high-field negative magnetoresistances coexist in such a system at room temperature, which can be explained by considering a shell/core model. Nonlinear current-voltage curve and photovoltaic effect further confirm the tunneling-type conduction. Supported by the National Natural Science Foundation of China (Grant Nos. 50672132 and 60576015) and the Key Project of Chinese Ministry of Education (Grant No. 107020)
%K magnetoresistance
%K magnetic properties
%K thin film<br>磁致电阻
%K 多相铁氧薄膜
%K 磁性
%K 反应溅射法
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=432A9D2C728611FBA2B202E5950E60D0&yid=A732AF04DDA03BB3&vid=286FB2D22CF8D013&iid=59906B3B2830C2C5&sid=BF7851EF606736C9&eid=371466E036DA0FD9&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=0&reference_num=33