Significant enhancement of magnetoresistance with the reduction of particle size in nanometer scale

Scientific Reports
Kalipada DasI Das

Abstract

The Physics of materials with large magnetoresistance (MR), defined as the percentage change of electrical resistance with the application of external magnetic field, has been an active field of research for quite some times. In addition to the fundamental interest, large MR has widespread application that includes the field of magnetic field sensor technology. New materials with large MR is interesting. However it is more appealing to vast scientific community if a method describe to achieve many fold enhancement of MR of already known materials. Our study on several manganite samples [La(1-x)Ca(x)MnO3 (x = 0.52, 0.54, 0.55)] illustrates the method of significant enhancement of MR with the reduction of the particle size in nanometer scale. Our experimentally observed results are explained by considering model consisted of a charge ordered antiferromagnetic core and a shell having short range ferromagnetic correlation between the uncompensated surface spins in nanoscale regime. The ferromagnetic fractions obtained theoretically in the nanoparticles has been shown to be in the good agreement with the experimental results. The method of several orders of magnitude improvement of the magnetoresistive property will have enormous po...Continue Reading

References

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Aug 27, 2009·Proceedings of the National Academy of Sciences of the United States of America·Run-Wei LiJiandi Zhang
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Citations

Feb 11, 2021·ACS Applied Materials & Interfaces·Kyle P KelleyRama K Vasudevan
May 21, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Dipak MazumdarI Das

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Methods Mentioned

BETA
x-ray diffraction
Scanning Electron Microscopy

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