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The present work reports on the inelastic, spin-dependent tunneling in magnetic junctions with AlOx barrier and Co50Fe50 ferromagnetic (FM) electrodes. The identification of the transport inelastic channels is possible through their distinctive temperature dependencies. For the observed temperature behavior of the magnetotransport properties of the junctions, two spin-dependent, inelastic mechanisms are proposed: assisted tunneling due to interfacial (a) magnons and (b) metallic phonons. Their relative contributions are closely linked to the microstructural properties of the FM metal/oxide interfaces, related to the plasma oxidation of the tunnel barrier and to thermal annealing.
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Dimopoulos et al. (2004) studied this question.
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