Magnetic memory based on La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7)/La_(0.7)Ca_(0.3)MnO_(3) ferromagnet/superconductor hybrid structures
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2010
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American Institute of Physics
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Abstract
We report a memory concept utilizing ferromagnet/superconductor/ferromagnet La_(0.7)Ca_(0.3)MnO_(3)/YBa_(2)Cu_(3)O_(7)/La_(0.7)Ca_(0.3)MnO_(3) thin film hybrid structures. The orientation of the magnetic field with respect to the ferromagnetic easy axis has a strong effect on superconductivity as indicated by a strong variation in the magnetoresistance MR. MR can be controlled by rotating a small magnetic field applied in the plane of the film in a way that is determined by the in-plane biaxial magnetic anisotropy. The proposed memory device has the advantages of superconducting detection elements fast response and low dissipation, small 100–150 Oe writing fields, and resistance read-out without need for applied field.
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© 2010 American Institute of Physics. We thank A. Goldman for fruitful discussions within the framework of the joint U.S.-Spain NSF Materials World Network Grant No. 709584. Work was supported by the U.S. Department of Energy, Basic Energy Science under Contract Nos. DE-AC02-06CH11357 and DE-AC02NA25396, by Spanish MICINN under Contracts “Ramon y Cajal,” Grant Nos. MAT2008-06517 and CONSOLIDER INGENIO 2010 CSD2009-00013 IMAGINE, by CAM under PHAMA Grant No. S2009/Mat-1756, and by OTKA Grant Nos. K68807 and PF63954 and the “Bolyai” program of the Hungarian Academy of Sciences.