Thickness Dependence of Giant Magnetoresistance in Spin Valves: Influence of Interface and Bulk Scattering

Wang, Li; Han, Guchang; Wu, Yihong

doi:10.1109/tmag.2006.887359

Cited by 1 publication

(1 citation statement)

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“…These numerical values lead to ≈99.65% magnetoresistance, that is quite close to the maximum possible MR = 100% for this coherent regime. Compare this to purely incoherent currents where there will be no MR at all in such two-layer system, so that the finite effect only appears from their partial mixing due to scattering at the interfaces [9,16] and is estimated phenomenologically as ∼ exp(−d/ ) of the above maximum value.…”

Section: Numerical Calculationsmentioning

confidence: 96%

Quantum effects in atomically perfect specular spin valve structures

Teixeira¹,

Ventura²,

Pogorelov³

et al. 2008

J. Phys.: Condens. Matter

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A simple tight-binding theoretical model is proposed for spin-dependent, current-in-plane transport in highly coherent spin valve structures under specularity conditions. Using quantum-mechanically coherent and spatially quantized Fermi states in the considered multilayered system, a system of partial Boltzmann kinetic equations is built for relevant subbands to yield the expressions for conductance in parallel or antiparallel spin valve states and thus for the magneto-conductance. It is shown that specularity favors the magnetoresistance for this structure reaching a high value (very close to 100%). This result is practically independent of the model parameters, in particular it does not even need that the lifetimes of majority and minority carriers be different (as necessary for the quasiclassical regimes). The main MR effect in the considered limit is due to the transformation of coherent quantum states, induced by the relative rotation of magnetization in the FM layers. Numerical calculations based on the specific Boltzmann equation with an account of spin-dependent specular reflection at the interfaces is also performed for a typical choice of material parameters.

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Section: Numerical Calculationsmentioning

confidence: 96%