Enhanced magnetoresistance in YBa2Cu3O7/Nd0.7Sr0.3MnO3 heterostructures using magnetic flux focusing
- 25 November 1996
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 69 (22) , 3432-3434
- https://doi.org/10.1063/1.117283
Abstract
Enhanced low field magnetoresistance (MR) in Nd0.7Sr0.3MnO3 (NSMO) has been achieved by using high‐Tc superconducting flux focusing devices made of YBa2Cu3O7(YBCO)/NSMO heterostructures. Two kinds of flux focusing schemes, gap, and washer devices, have been used where an applied magnetic field is expelled from patterned YBCO pads and focused onto a bridge of NSMO film. Using such a magnetic lens, at temperatures below 77 K ∼800% enhancement in MR=−(RH−R0)/R0 was observed for different samples. This corresponds to more than 10% change in the MR of NSMO in the presence of 200 G. For the maximum MR response in NSMO, the YBCO/NSMO heterostructures were deposited on (100) LaAlO3 substrate by pulsed laser deposition in situ so that the peak resistance temperature (Tp) of NSMO was below the superconducting transition temperature (Tc) of YBCO.Keywords
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