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Title: Study of low field magneto-resistance in La0.67A0.33MnO3 [A ≡ Ca, Ba, Sr] screen printed films
Authors: Khare, Neeraj
Moharil, U P
Singh, B
Gupta, A K
Keywords: Magneto-resistance;Polycrystalline films;Epitaxial films;Laser ablation technique;spin Polarized tunneling
Issue Date: Jan-2004
Publisher: CSIR
Abstract: Screen printed polycrystalline films of La0.67A0.33MnO3 [A ≡ Ca, Ba, Sr] have been found to exhibit substantially large magneto-resistance at low fields and low temperature as compared to an epitaxial La0.67Ba0.33MnO3 film prepared by laser ablation technique. A value of magneto-resistance ratio (MRR) of 6 % has been achieved even at a dc field of 600 Oe at 77 K. Temperature dependence of MRR of the screen-printed films show that MRR increases with decrease of the temperature. This MRR-T behaviour shows that magneto-resistance in screen printed films has its origin in grain boundaries. The variation of MRR of these films with magnetic field at 77 K shows sharp increase in the field 0-1 kOe and slower increase for the field 1-3 kOe. Sharp increase in the MRR has been attributed to spin polarized tunnelling occurring across the grain boundaries, where as the slower increase in MRR for a field variation of 1-3 kOe is due to suppression of spin disorders present in the grain boundary region in the polycrystalline films.
Page(s): 62-66
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.42(01) [January 2004]

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