Xiao-Hang Li et al 2002 J. Phys.: Condens. Matter 14 L177 doi:10.1088/0953-8984/14/8/101
Xiao-Hang Li, Yun-Hui Huang, Chun-Hua Yan1, Zhe-Ming Wang and Chun-Sheng Liao
Show affiliationsNanocrystalline La0.7Sr0.3Mn0.9M0.1O3 (M = Cr, Mn, Fe, Ni, Cu) powder samples were prepared by a sol-gel method. In the samples Mn atoms were partially substituted by a transition metal M. Pure perovskite phase nanocrystalline grains (~60 nm in diameter) were confirmed for all the samples through XRD and SEM observations. Magnetization and magnetoresistance of selected samples were investigated over a temperature range of 5 to 350 K, under a magnetic field of up to 5 T. Strong low field sensitive magnetoresistance was detected in Fe and Ni substituted samples. Spin polarized tunnelling and substitution modified non-balance magnetization processes are believed to be the origin of the enhanced low field sensitivity.
61.46.-w Structure of nanoscale materials
75.60.Ej Magnetization curves, hysteresis, Barkhausen and related effects
Issue 8 (4 March 2002)
Received 31 July 2001, in final form 22 August 2001
Published 15 February 2002
Xiao-Hang Li et al 2002 J. Phys.: Condens. Matter 14 L177
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