Enhanced low field magnetoresistance in Mn substituted nanocrystalline La0.7Sr0.3Mn0.9M0.1O3
- Li, XH
- Huang, YH
- Yan, CH
- Wang, ZM
- Liao, CS
DOIAbstract
Nanocrystalline 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 (similar to60 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.http://gateway.web...
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