Directionally controlled superconductivity in ferromagnet/superconductor/ferromagnet trilayers with biaxial easy axes
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2010
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American Physical Society
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Abstract
We report on the magnetic anisotropy controlled modulation of the superconductivity in La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7−δ)/La_(0.7)Ca_(0.3)MnO_(3) 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.
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© 2010 The American Physical Society. Artículo firmado por 12 autores. 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.