Download Nanoscale phase separation and colossal magnetoresistance. by Elbio Dagotto PDF

By Elbio Dagotto

The learn of the spontaneous formation of nanostructures in unmarried crystals of numerous compounds is now a tremendous quarter of study in strongly correlated electrons. those constructions seem to originate within the festival of stages. The booklet addresses nanoscale part separation, targeting the manganese oxides often called manganites that experience the great magnetoresistance (CMR) influence of strength relevance for equipment purposes. it truly is argued that the nanostructures are on the middle of the CMR phenomenon. The publication includes up-to-date details on manganite learn directed to specialists, either theorists and experimentalists. in spite of the fact that, graduate scholars or postdocs will locate massive introductory fabric, together with parts of computational physics.

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Extra resources for Nanoscale phase separation and colossal magnetoresistance. Manganites

Sample text

8 in the figure corresponds to a measured MR ratio that is about 400% in the optimistic definition of the MR ratio [139, 140]. Recently, similar high MR ratios have been reported. Thus, we understand how a high MR ratio is realized in clean Fe/MgO/Fe junctions. However, high MR ratios also occur in disordered ferromagnetic electrodes such as FeCoB, which has an amorphous structure [150]. Possible reasons for this may be that B atoms may reside on regular sites in the fcc structure after annealing, and the electronic states of B atoms have energies that are distant from the Fermi energy.

33) indicates a balance between the spin accumulation and spin-flip rate. Using the parameters given in Fig. 22, the MR ratio is calculated for an F/N/F trilayer as a function of LF/LN, where LF and LN are the thicknesses of the F and N layers, respectively. We can see that the MR ratio becomes small when the spin-diffusion length is short. 02 0 5 15 10 20 25 LF/LN FIGURE 22 Calculated MR ratio in the Valet–Fert model. LF and LN are the thicknesses of the ferromagnetic and non-magnetic layers, respectively.

Therefore, we expect rþ ( rÀ for Co/Cu multilayers. The spin-dependent resistivity due to magnetic TM impurities in Cu may be estimated by applying the Anderson model. The MR ratio thus calculated is shown in Fig. 18 as a function of the number of d-electrons of the TM impurities [90]. The results are compared with the experimental values in the figure [97–102]. We see that the MR ratio becomes high for Co/Cu multilayers, consistent with experimental results. The calculated results indicate that Ni/Cu shows no MR, in contradiction to the experimental results.

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