Year: 2004
Type: article
Abstract: 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 I J spin ∝ sin (θ 1 − θ 2 ). Here the phases are associated with the planar contribution to the magnetization, ⟨ c ↑ † c ↓ ⟩ ∼ e i θ . 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: [θ, S z ] = i . This is the counterpart to the commutation relation [φ, N ] = i 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.
Source: Europhysics Letters (EPL)
Authors: F. S Nogueira, K.-H Bennemann
Institution: Freie Universität Berlin
Language: English
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2035940841