Enhancing low-field magnetoresistance of La0.67Ca0.33MnO3 films deposited on anodized aluminium-oxide membranes
Tang Wei-Hua (唐为华)ab, Li Pei-Gang (李培刚)b, Lei Ming (雷鸣)b, Guo Yan-Feng (郭艳峰)b, Chen Lei-Ming (陈雷明)b, Li Ling-Hong (李玲红)c, Song Peng-Yun (宋朋云)d, Chen Chinping (陈晋平)d
a Department of Physics, Center for Optoelectronics materials and Devices, Zhejiang Sci-Tech University, Xiasha College Park, Hangzhou 310018, China; b Beijing National Laboratory for Condensed Matter Physics,Institute of Physics, Chinese Academy of Sciences,Beijing 100080, China; c Department of Physics, University of Dayton, Dayton, OH 45469, USA; d Department of Physics, Peking University, Beijing 100871, China
Abstract In this paper we report a new method to fabricate nanostructured films. La0.67Ca0.33MnO3 (LCMO) nanostructured films have been fabricated by using pulsed electron beam deposition (PED) on anodized aluminium oxide (AAO) membranes. The magnetic and electronic transport properties are investigated by using the Quantum Design physics properties measurement system (PPMS) and magnetic properties measurement system (MPMS). The resistance peak temperature (Tp) is about 85\,K and the Curie temperature (Tc is about 250 K for the LCMO film on an AAO membrane with a pore diameter of 20\,nm. Large magnetoresistance ratio (MR) is observed near Tp. The MR is as high as 85% under 1 T magnetic field. The great enhancement of MR at low magnetic fields could be attributed to the lattice distortion and the grain boundary that are induced by the nanopores on the AAO membrane.
Received: 30 December 2005
Revised: 23 February 2006
Accepted manuscript online:
Tang Wei-Hua (唐为华), Li Pei-Gang (李培刚), Lei Ming (雷鸣), Guo Yan-Feng (郭艳峰), Chen Lei-Ming (陈雷明), Li Ling-Hong (李玲红), Song Peng-Yun (宋朋云), Chen Chinping (陈晋平) Enhancing low-field magnetoresistance of La0.67Ca0.33MnO3 films deposited on anodized aluminium-oxide membranes 2006 Chinese Physics 15 767
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