Periodic Enhancement of the Electron-Electron Interactions and the Magnetoresistance in Magnetic Co/(Cr/Ag)/Co Multilayers

Aliev, F.G.; Kunnen, E.; Temst, Kristiaan; Mae, K.; Verbanck, G.; Barnaś, J.; Moshchalkov, Victor; Bruynseraede, Y.

doi:10.1103/physrevlett.78.134

Cited by 30 publications

(19 citation statements)

References 21 publications

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“…The presence of large narrow peaks in the dependence of the coupling constant λ on the width of the Ag layer observed in Co/Cr/Ag/Co structures [1] is consistent with our considerations. A rough estimation of the magnitude and width of peaks is also consistent with experimental observations.…”

supporting

confidence: 91%

“…The peaks occur in the thickness dependence of the factor λ and originate from some peculiarities in electron screening, which are due to spin-splitting of the electron subbands in SQWs. Our results may explain the origin of a recently observed enhancement of the logarithmic term in resistivity of Co/Cr/Ag/Co structures, which was found at certain values of the Cr/Ag bilayer thicknesses [1]. The key point of the model is the existence of SQWs, which result from the Stoner splitting of the electron bands in transition metals.…”

supporting

confidence: 60%

“…3 as dashed vertical lines, where also the experimental data are reproduced from ref. [1]. Despite the simplifications, agreement between experimental and theoretical positions of the peaks is quite satisfactory.…”

mentioning

confidence: 82%

“…[1]. The spin-down quantum well corresponds then to the Ag sublayer, while the spin-up quantum well corresponds to the Ag/Co bilayer.…”

mentioning

confidence: 99%

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Electron-electron interaction effects in magnetic layered structures

Dugaev

Barnaś

2001

Europhys. Lett.

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Abstract. -We consider some peculiarities of the logarithmic electron-electron interaction corrections to conductivity, which can arise in magnetic quantum wells due to spin-splitting of energy levels. The matrix elements of Coulomb interaction include different screening contributions from spin-up and spin-down electrons, which can lead to anomalous behavior of the interaction constant when the width of a spin quantum well is changed. Our results explain qualitatively the physical origin of the recently observed anomalous behavior of the logarithmic term in electrical resistivity of Co/Cr/Ag/Co layered structures (Aliev F. G. et al., Phys. Rev. Lett., 78 (1997) 134).There has been a great interest recently in confined structures with magnetic and nonmagnetic materials, like metallic magnetic multilayers or magnetic tunnel junctions [1][2][3][4]. An important feature of such systems is the existence of spin quantum wells (SQWs), i.e., different quantum wells for electrons with opposite spin orientations. Although a lot of work has been done on transport properties of magnetic layered structures, the low-temperature regime, where quantum corrections due to weak localization and electron-electron interaction are important [5][6][7], is still not well understood [1,[8][9][10]. The main issue is related to an internal magnetic field which may suppress the localization corrections. However, nonvanishing localization corrections were observed, e.g., in percolating Ni films [10]. On the other hand, the available results on low-temperature transport properties of epitaxial iron films [9] can be explained by both localization and interaction corrections. As is well known, the electronelectron interaction corrections are weakly sensitive to magnetic field and therefore can be expected to play a significant role in magnetic materials [11].( * ) Present address:

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supporting

confidence: 91%

supporting

confidence: 60%

mentioning

confidence: 82%

“…[1]. The spin-down quantum well corresponds then to the Ag sublayer, while the spin-up quantum well corresponds to the Ag/Co bilayer.…”

mentioning

confidence: 99%

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Electron-electron interaction effects in magnetic layered structures

Dugaev

Barnaś

2001

Europhys. Lett.

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“…The resistivity increase below 40 K (Fig. 1b) scales with − log T , pointing either to a Kondo-type problem or to a resistivity contribution caused by electron-electron interactions [27].…”

Section: Correlations Between the Structure And Resistive/magnetic Prmentioning

confidence: 98%

Influence of the cooperative Jahn-Teller effect on the transport and magnetic properties ofLa7/8Sr1/8<

et al. 2000

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The low-doped magnetic perovskite La 7/8 Sr 1/8 MnO 3 undergoes within the paramagneticsemiconducting phase a first-order structural transition due to antiferrodistorsive ordering of Jahn-Teller deformed MnO 6 octahedra. This allows to study not only the influence of the spin configuration on the magneto-transport properties (CMR effect) but also the role of orbital order and disorder. The orbital ordering transition (at 269 K in zero magnetic field) causes a doubling of the resistivity (regardless of the CMR effect in applied magnetic fields) and a drop of the paramagnetic susceptibility. The latter might be interpreted in terms of a shrinking of spin polarons. External magnetic fields shift the ordering transition to lower temperatures according to the field-induced decrease of the carrier localization. The magnetic field -temperature phase boundary line was investigated by means of magnetoresistance (up to 12 T) and pulsed-fields magnetization measurements up to 50 T. The pronounced magnetization anomalies, associated with the phase transition, vanish for fields exceeding 20 T. This behaviour has been attributed to a field-induced crossover from antiferrodistorsive order to a nondistorsive/ferromagnetic orbital configuration. PACS

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Absence of weak electron localization in (Co/Pt)n-multilayer-nanowires with perpendicular anisotropy

Brands¹,

Carl

Dumpich

2005

Ann. Phys.

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We report on low temperature resistance and magnetoresistance (MR) measurements for various (Co/Pt)nmultilayer-nanowires with perpendicular magnetic anisotropy and different widths, designed as model systems for the experimental observation of weak electron localization effects in ferromagnetic systems as proposed by Dugaev et al. [Phys. Rev. B 64, 144423 (2001)]. The low temperature MR is found to originate from both the anisotropic MR and domain wall scattering. The temperature dependence of the resistance shows a logarithmic resistance increase with decreasing temperature, as it is typical for quantum corrections in two dimensional systems. Upon application of a perpendicular magnetic field, however, the slope of the logarithmic resistance increase does not change in magnitude, which proofs that weak localization effects are not present, at least within the accuracy of our measurements. Instead, the observed quantum corrections of the resistance are well explained by enhanced electron-electron interaction effects in two dimensions. The results are discussed with regard to recent experimental as well as theoretical works.

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Periodic Enhancement of the Electron-Electron Interactions and the Magnetoresistance in Magnetic Co/(Cr/Ag)/Co Multilayers

Cited by 30 publications

References 21 publications

Electron-electron interaction effects in magnetic layered structures

Electron-electron interaction effects in magnetic layered structures

Influence of the cooperative Jahn-Teller effect on the transport and magnetic properties ofLa7/8Sr1/8<

Absence of weak electron localization in (Co/Pt)n-multilayer-nanowires with perpendicular anisotropy

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