Pure spin currents generation in magnetic tunnel junctions by means of adiabatic quantum pumping |
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Authors: | F Romeo R Citro |
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Affiliation: | (1) Dipartimento di Fisica “E.R. Caianiello", Università degli Studi di Salerno, C.N.I.S.M. Unità di Salerno, via S. Allende, 84081 Baronissi (SA), Italy |
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Abstract: | We study the spin polarized currents generation in a magnetic
(ferromagnetic/ferromagnetic) tunnel junction by means of
adiabatic quantum pumping. Using a scattering matrix approach, it
is shown that a pure spin current can be pumped from one
ferromagnetic lead into the adjacent one by adiabatic modulation
of the magnetization and the height of the barrier at the
interface in absence of external bias voltage. We numerically
study the characteristic features of the pure spin current and
discuss its behavior for realistic values of the parameters. We
show that the generated pure spin current is robust with respect
to the variation of the magnetization strength, a very important
feature for a realistic device, and that the proposed device can
operate close to the optimal pumping regime. An experimental
realization of a pure spin current injector is also discussed. |
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Keywords: | 72 25 Ba Spin polarized transport in metals 05 60 Gg Quantum transport 85 75 -d Magnetoelectronics spintronics: devices exploiting spin polarized transport or integrated magnetic fields |
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