Spin Dynamics in a Tunnel Junction between Ferromagnets

Details Spin Dynamics in a Tunnel Junction between Ferromagnets Spin Dynamics in a Tunnel Junction between Ferromagnets

2006-09-26

arxiv.org/abs/cond-mat/0609673v3

New J. Phys., 10, 013017 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 1 figure, accepted in the New Journal of Physics

Scientific paper

10.1088/1367-2630/10/1/013017

The dynamics of a single spin embedded in the tunnel junction (quantum point contact) between ferromagnets is addressed. Using the Keldysh technique, we derive a quantum Langevin equation. As a consequence of the spin-polarization in the leads, the spin displays a rich and unusual dynamics. Parallel configured and equally strong magnetic moments in the leads yield an ordinary spin precession with a Larmor frequency given by the effective magnetic field. Unequal and/or non-parallel configured magnetization, however, causes nutation of the spin in addition to the precession. Our predictions may be directly tested for macroscopic spin clusters.

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