Magnetoresistance in hybrid organic spin valves at the onset of multiple-step tunneling

J.J.H.M. Schoonus, P.G.E. Lumens, W. Wagemans, J.T. Kohlhepp, P.A. Bobbert, H.J.M. Swagten, B. Koopmans

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By combining experiments with simple model calculations, we obtain new insight in spin transport through hybrid, CoFeB/Al2O3(1.5nm)/tris(8- hydroxyquinoline)aluminium (Alq3)/Co spin valves. We have measured the characteristic changes in the I-V behavior as well as the intrinsic loss of magnetoresistance at the onset of multiple-step tunneling. In the regime of multiple-step tunneling, under the condition of low hopping rates, spin precession in the presence of hyperfine coupling is conjectured to be the relevant source of spin relaxation. A quantitative analysis leads to the prediction of a symmetric magnetoresistance around zero magnetic field in addition to the hysteretic magnetoresistance curves, which are indeed observed in our experiments. © 2009 The American Physical Society
Originele taal-2Engels
Pagina's (van-tot)146601-1/4
Aantal pagina's4
TijdschriftPhysical Review Letters
Nummer van het tijdschrift14
StatusGepubliceerd - 2009

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