Spin-polarized quasiparticle injection devices using Au/YBa2Cu3O7/LaAIO3/Nd 0.7Sr0.3MnO3 heterostructures

Journal Article

Dong, Z.W., Ramamoorthy Ramesh, T. Venkatesan, M. Johnson, Z.Y. Chen, S.P. Pai, V. Talyansky, R.P. Sharma, R. Shreekala, C.J. Lobb, R.L. Greene

10.1063/1.120014

Oxide heterostructures were used for studies of quasiparticle injection effects in high-Tc superconducting thin films. The effect of injection of spin polarized quasiparticles from a ferromagnetic gate layer was compared to that of unpolarized quasiparticles from a nonmagnetic metallic gate. Transport measurements of the superconducting layer showed strong suppression in the supercurrent by the injection of spin-polarized quasiparticles, and a current gain of as large as five was attained. This is 10 to 30 times larger than the gain of unpolarized injection devices. Such large effects could be useful in a variety of active high-Tc superconductor/colossal magnetoresistance heterostructure based devices. © 1997 American Institute of Physics.

Applied Physics Letters

71

1997

00036951

Ramesh Lab