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Title: <link rel="File-List" href="file:///C:%5CDOCUME%7E1%5Ccharu%5CLOCALS%7E1%5CTemp%5Cmsohtml1%5C01%5Cclip_filelist.xml"> Self-injection length of polarized spins in La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> -YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-</sub><sub>d</sub> ferromagnet-superconductor heterostructures
Authors: Banerjee, T
Wanchoo, S K
Pai, S P
Spallart, M Neumann
Narsale, A M
Pinto, R
Keywords: Self-injection
Issue Date: Oct-2004
Publisher: CSIR
Series/Report no.: H 01L 39/00, C 04B 35/00
Abstract: <link rel="File-List" href="file:///C:%5CDOCUME%7E1%5Ccharu%5CLOCALS%7E1%5CTemp%5Cmsohtml1%5C01%5Cclip_filelist.xml"> Studies on the self-injection length of polarized spins in La<sub>0.7</sub>Ca<sub>0.3</sub>MnO<sub>3</sub> (LCMO)-YBa<sub>2</sub>Cu<sub>3</sub>O<sub>7-</sub><sub>d</sub> (YBCO) heterostructures on LaAlO<sub>3</sub> (LAO) substrates fabricated <i style="">in situ</i> with pulsed laser deposition have been carried out. The measured critical current density, <i>J<sub>c</sub></i> of YBCO microbridges on LAO (control) arm was found to be larger than that of the microbridges on the LCMO arm. The difference in <i>J<sub>c</sub></i> 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 <i>T<sub>c</sub></i> 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 (LaNiO<sub>3</sub>) heterostructure did not show any evidence of self-injection.
Description: 764-770
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.42(10) [October 2004]

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