Volume 67, Number 4, August 2004
|Page(s)||620 - 626|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 August 2004|
Spin Josephson effect in ferromagnet/ferromagnet tunnel junctions
Institut für Theoretische Physik, Freie Universität Berlin Arnimallee 14, D-14195 Berlin, Germany
Accepted: 10 June 2004
We consider the tunnel current between two ferromagnetic metals from a perspective similar to the one used in superconductor/superconductor tunnel junctions. We use fundamental arguments to derive a Josephson-like tunnel spin current . Here the phases are associated with the planar contribution to the magnetization, . The crucial step in our analysis is the fact that the z-component of the spin is canonically conjugate to the phase of the planar contribution: . This is the counterpart to the commutation relation in superconductors, where φ is the phase associated with the superconducting order parameter and N is the Cooper pair number operator. We briefly discuss the experimental consequences of our theoretical analysis.
PACS: 72.25.-b – Spin polarized transport / 72.25.Mk – Spin transport through interfaces / 74.50.+r – Tunneling phenomena; point contacts, weak links, Josephson effects
© EDP Sciences, 2004
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