Directionally controlled superconductivity in ferromagnet/superconductor/ferromagnet trilayers with biaxial easy axes

7 páginas, 7 figuras.-- et al.
We report on the magnetic anisotropy controlled modulation of the superconductivity in La0.7 Ca0.3 MnO3/ YBa 2 Cu3O7-δ / La0.7 Ca 0.3 MnO3 ferromagnet/superconductor/ferromagnet hybrids with biaxial easy axes. The magnetoresistance (MR) is determined by the local misalignment of the magnetizations in the two layers and exhibits a positive MR plateau for antiparallel alignment along the easy axes and negative MR peaks at the coercive field near the hard axes. This evidences the importance of spin-dependent interfacial scattering effects (as opposed to stray fields) in the MR behavior of superconducting oxide inverse spin switches. © 2010 The American Physical Society.
We thank A. Goldman for fruitful discussions within the framework of the joint U.S.-Spain NSF Materials World Network under Grant No. 709584. This work was supported by the U.S. Department of Energy, Basic Energy Science, under Contracts No. DE-AC02-06CH11357 and No. DEAC02NA25396, by Spanish MICINN under Grant No. MAT2008-06517, Consolider Ingenio 2010 Grant CSD2009-00013 Imagine, and “Ramon y Cajal” program, by CAM under Grant S2009/Mat-1756 Phama , and by OTKA under Grants No. F61733, No. K68807, and No. PF63954, and the “Bolyai” program of the Hungarian Academy of Sciences.