ac transport in ferromagnetic tunnel junctions

Chui, S. T.; Hu, Liangbin
January 2002
Applied Physics Letters;1/14/2002, Vol. 80 Issue 2, p273
Academic Journal
To study possible capacitive effects, we incorporate the effect of electron interaction on the ac spin-polarized tunnelling. Under steady-state nonequilibrium conditions, the voltage-induced charge accumulated at the interface is a sum of two terms, decaying with length scales of the order of the screening length and the spin diffusion length. As a result, the effective width of the capacitor is changed by an additional term. This additional term is a function of the magnetic configurations on opposite sides of the junction and a magnetocapacitance is introduced. © 2002 American Institute of Physics.


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