Magnetoresistance in YBCO/LSMO bilayers

摘要

The magnetoresistance (MR) behavior in YBa_2Cu_3O_7/La_(0.7)Sr_(0.3)MnO_3 (YBCO/LSMO) bilayers grown on (100) LaAlO_3 substrate ate investigated. It is found that by increasing the thickness of YBCO (t) from zero to 200 nm, the MR ratio at 300K is suppressed from -15% to near zero. On the other hand, the MR ratio at 77 K increases from -5 % to -20 % as t increases to 50 nm, which is attributed to the spin accumulation at the interface between YBCO and LSMO layers.