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Magneto-optic effects in spin-injection devices

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6 Author(s)
Ruggiero, S.T. ; Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 ; Williams, A. ; Tanner, C.E. ; Potashnik, S.
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The magneto-optic properties of semi-transparent ferromagnetic films are presented in the context of ferromagnet/GaAs spin-injection devices. We have measured the polarization-dependent photoresponse and magneto-optic properties of Co/n-GaAs, Co/p-GaAs and NiFe/n-GaAs Schottky diodes and NiFe/SiO2 and Co/SiO2 structures as a function of ferromagnetic film thickness, ranging from 8 to 100 nm. Our results show that magneto-optic effects intrinsic to the ferromagnetic films (2%–3%) are sufficient to account for the majority of the polarization-dependent photoresponse of the ferromagnet/GaAs systems studied. These effects are well described by a simple thin-film transmission model, which gives an upper limit of 0.4% for spin-transmission effects. © 2003 American Institute of Physics.

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Applied Physics Letters  (Volume:82 ,  Issue: 25 )