Indications of antiferromagnetic interlayer coupling in La2/3Ba1/3MnO3/LaNiO3 multilayers

Nikolaev, K. R.; Bhattacharya, Anand; Kraus, Patrick; Vas'ko, V. A.; Cooley, W.; Goldman, A. M.

doi:10.1063/1.124294

Cited by 45 publications

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References 17 publications

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“…Magnetic multilayer structures based on transition metals 1,2 and their compounds [1][2][3][4][5][6][7][8][9][10][11][12][13][14] have high potential for technological applications as their transport and magnetic properties can be controlled with the non-magnetic spacer layer thickness. However, to use these materials for applications, it is necessary to understand and control precisely the physical properties that depend on various parameters such as the layer materials, their thicknesses and the interfaces between them.…”

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Interfacial strain measurements ofSrRuO3∕SrMnO3magnetic multilayers

2004

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Magnetic multilayers of (SrRuO 3 ) m (SrM nO 3 ) n were grown artificially using the pulsed laser deposition technique on (001)-oriented SrT iO 3 substrates.The state of strain at the interfaces and the structural coherency are studied in details utilizing asymmetrical X-ray diffraction and the sin 2 ψ method.First, the evolution of the lattice parameters, the crystallinity and the epitaxy of the films are evaluated as a function of the number of SrM nO 3 unit cells using X-rays diffraction and transmission electron microscopy. Second, our results on the stress indicate that the SrRuO 3 /SrM nO 3 superlattices show a larger residual strain as compared to the single layer film of SrRuO 3 . This suggests that the lattice stiffening from interfacial strain and inhibiting the dislocation by composition modulation. Finally, these results bring insights on the interfacial stress measurements of oxide multilayers that can be used to control the physical properties at the level of the atomic scale. * prellier@ismra.fr

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Interfacial strain measurements ofSrRuO3∕SrMnO3magnetic multilayers

2004

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“…Characterization by high resolution X-ray diffraction showed that the films were monocrystalline with c-axis oriented perpendicular to the substrate. Well-defined satellite peaks indicated the sharpness of the interfaces and good superlattice periodicity [16]. Cross-sectional transmission electron microscopy demonstrated the continuity of the layers over macroscopic scales, and notably defect-free structures on atomic length scales.…”

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“…In thin film form, it is a better conductor (resistivity of 50 − 100 µΩ · cm) than the manganites (resistivity of 300 − 500 µΩ · cm). Although advances in oxide film growth permit the fabrication of atomically defined layered structures with nanometer scale periodicity [15], the very strict control over stoichiometry and deposition conditions required to produce multilayers remains a significant experimental challenge.In our previous paper [16] we presented the evidence for antiferromagnetic (AFM) interlayer coupling in this system. Here we demonstrate that the initially AFM coupling becomes ferromagnetic (FM) at larger spacer thicknesses and explain this behavior within the RKKY model.…”

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Oscillatory Exchange Coupling and Positive Magnetoresistance in Epitaxial Oxide Heterostructures

et al. 2000

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Oscillations in the exchange coupling between ferromagnetic La 2/3 Ba 1/3 M nO3 layers with paramagnetic LaN iO3 spacer layer thickness has been observed in epitaxial heterostructures of the two oxides. This behavior is explained within the RKKY model employing an ab initio calculated band structure of LaN iO3, taking into account strong electron scattering in the spacer. Antiferromagnetically coupled superlattices exhibit a positive current-in-plane magnetoresistance. 75.70.Cn, 75.30.Vn, 71.18.+y, 75.70.Pa Since the discovery of giant magnetoresistance [1] and oscillatory interlayer coupling [2], metallic magnetic multilayers have been the subject of intensive research [3]. A physical picture of the coupling is provided in terms of quantum interference due to confinement of electrons in the nonmagnetic spacers [4,5]. Ruderman-KittelKasuya-Yosida (RKKY) theory [6], successfully used to describe the effect, appears to be a limiting case of a more general approach [5]. The prediction that oscillations periods are determined by the extremal spanning vectors of the Fermi surface of the nonmagnetic spacer is now supported by a wealth of experimental data [7]. The phase and magnitude of the coupling oscillations apparently are sensitive to the interface matching of the electron bands for a particular magnetic configuration of the layers [3][4][5].While these effects have been studied in many simple metal and alloy systems, little progress has been achieved in investigating them in multilayers consisting entirely of compounds [8]. In this Letter we report the first observation of oscillatory coupling in heterostructures fabricated entirely of oxides, thus extending the field to a novel class of materials. The ferromagnetic layer material, barium-doped lanthanum manganese oxide La 2/3 Ba 1/3 M nO 3 belongs to the family of metallic manganese oxides that exhibit very large (colossal) magnetoresistance [9]. Double exchange ferromagnetism [10] predicts half-metallicity in these compounds, which has been justified by ab initio band structure calculations [11] as well as confirmed (to a certain degree) experimentally [12]. As a spacer layer material, we have employed LaN iO 3 , which is lattice-matched to La 2/3 Ba 1/3 M nO 3 , and is the only rare earth nickelate that is a paramagnetic metal [13]. Its susceptibility is strongly enhanced by electron-electron exchange interactions [14]. In thin film form, it is a better conductor (resistivity of 50 − 100 µΩ · cm) than the manganites (resistivity of 300 − 500 µΩ · cm). Although advances in oxide film growth permit the fabrication of atomically defined layered structures with nanometer scale periodicity [15], the very strict control over stoichiometry and deposition conditions required to produce multilayers remains a significant experimental challenge.In our previous paper [16] we presented the evidence for antiferromagnetic (AFM) interlayer coupling in this system. Here we demonstrate that the initially AFM coupling becomes ferromagnetic (FM) at larger spacer thicknesses a...

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“…A few experimental investigations have explored heterostructures combining manganites and nickelates [5,[15][16][17][18][19][20][21]. Ferromagnetism that is present only at the interface between LaNiO 3 and CaMnO 3 has been observed by x-ray magnetic circular dichroism combined with polarized neutron reflectometry [16].…”

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Interfacial properties ofLaMnO3/LaNiO3superlattices grown along (001) and (111) orientations

et al. 2015

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We have employed x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD) at the Ni and Mn L 3,2 edges in LaMnO 3 /LaNiO 3 superlattices grown along (001) and (111) orientations. Our results show a significant XMCD signal and thus the presence of magnetic moments localized on both Ni and Mn, which are ferromagnetically coupled to each other. X-ray absorption experiments reveal a charge transfer between Ni and Mn which is larger for (111) than for (001) superlattices. These results are compared to theoretical predictions for such superlattices.

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Indications of antiferromagnetic interlayer coupling in La2/3Ba1/3MnO3/LaNiO3 multilayers

Cited by 45 publications

References 17 publications

Interfacial strain measurements ofSrRuO3∕SrMnO3magnetic multilayers

Interfacial strain measurements ofSrRuO3∕SrMnO3magnetic multilayers

Oscillatory Exchange Coupling and Positive Magnetoresistance in Epitaxial Oxide Heterostructures

Interfacial properties ofLaMnO3/LaNiO3superlattices grown along (001) and (111) orientations

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