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Title:  Self-injection length of polarized spins in La0.7Ca0.3MnO3 -YBa2Cu3O7-d ferromagnet-superconductor heterostructures
Authors: Banerjee, T
Wanchoo, S K
Pai, S P
Spallart, M Neumann
Narsale, A M
Pinto, R
Keywords: Self-injection;Heterostructures;Quasi-particles;Microbridges
Issue Date: Oct-2004
Publisher: CSIR
IPC Code: H 01L 39/00, C 04B 35/00
Abstract:  Studies on the self-injection length of polarized spins in La0.7Ca0.3MnO3 (LCMO)-YBa2Cu3O7-d (YBCO) heterostructures on LaAlO3 (LAO) substrates fabricated in situ with pulsed laser deposition have been carried out. The measured critical current density, Jc of YBCO microbridges on LAO (control) arm was found to be larger than that of the microbridges on the LCMO arm. The difference in Jc in the two arms indicates that a certain thickness of YBCO has become effectively normal due to self-injection of spin-polarized carriers. Further, by measuring transition temperature Tc of YBCO layers with ac susceptibility, it has been found that the thickness of the non-superconducting YBCO layer, due to self-injection at the interface, depends upon the LCMO thickness. Both the above experiments led us to estimate the maximum thickness of the non-superconducting YBCO layer at the interface due to self-injection of spin polarized quasi-particles from YBCO into LCMO; this thickness is found to be in the range 650-850 Å for LCMO thickness ≥ 1000 Å. A control experiment performed on YBCO-LNO (LaNiO3) heterostructure did not show any evidence of self-injection.
Page(s): 764-770
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.42(10) [October 2004]

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