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Charge and spin currents along the    c   -axis in ferromagnet-insulator-superconductor (F/I/S) tunneling junctions have been studied within the framework of the tunneling Hamiltonian model. As a superconductor    S   , HgBa 2 Ca 2 Cu 3 O 8+ δ   (Hg-1223) with   δ  =  0.4   copper-oxide high-T    csuperconductor has been selected, and as a ferromagnet  F , Fe metal with bcc structure has been selected for simplicity. The electronic structures of above materials have been calculated on the basis of the band theory using the spin-polarized self-consistent-field data for the atomic orbital energies and the universal tight-binding parameters (UTBP) for the interactions. For theη    ↑andη    ↓    (  =  1  -    η    ↑    )   defined in the present paper, which are tunneling probabilities of the majority and the minority spin electrons, it is shown that the conditionη    ↑    =    η    ↓means the standard F/I/S tunneling junction with a nonmagnetic insulating layer, and the conditionη    ↑    ≠    η    ↓    means the F/I/S tunneling junction with a magnetic insulating layer showing a detectable magnetization. We have found that the charge current and the differential conductance nearly remain the same as the change ofη    ↑, but the spin current is largely changed due to the change ofη    ↑. As an experimental method to detect the change of the spin current, the validity of an X-ray magnetic circular dichroism (XMCD) has been pointed out.

international journal of superconductivity

Charge and Spin Currents in Ferromagnet-Insulator-Superconductor Tunneling Junctions Using Hg-1223 High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" id="M1"><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math> Superconductor

Charge and Spin Currents in Ferromagnet-Insulator-Superconductor Tunneling Junctions Using Hg-1223 High-Tc Superconductor