Effect ofA-site cation ordering on the magnetoelectric properties in[(LaMnO3)m/(

Abstract

In order to evaluate the effect of charge transfer and/or charge ordering in La 1Ϫx Sr x MnO 3 on the magnetic and transport properties, a library of ͓(LaMnO 3 ) m /(SrMnO 3 ) m ͔ n superlattices have been fabricated by the combinatorial pulsed laser deposition method. The properties of superlattices were found to depend strongly on the periodicity m; superlattices of mр4 behaved like a solid solution La 0.5 Sr 0.5 MnO 3 film, while the superlattices of mϾ4 were significantly different from the solid solution. These superlattices exhibited a higher resistivity and lower Curie temperature than mр4 superlattices. The results indicate that the properties of the superlattices are dominated not only by the magnetic interaction between the superlattice constituents but also by carrier (e g electrons͒ transfer thorough the superlattice interface. The contribution of carrier transfer is supported by the magnetoelectric properties of another library of ͓(La 0.8 Sr 0.2 MnO 3 ) 8 /(La 0.2 Sr 0.8 MnO 3 ) m ͔ 12 superlattices. The A-site cation order can change both effective carrier concentration and magnetic interaction.

La Mn O 3 ∕ Sr Mn O 3 interfaces with coupled charge-spin-orbital modulation

“…Considering that both LMO and SMO films are antiferromagnetic insulators even under the epitaxial strain, 9,13 these data are consistent with our assumption that the orbital degree of freedom does play a crucial role at the interface of perovskite manganite. 16 Figure 4 shows proposed orbital structures at the LMO/SMO interfaces.…”

“…This result is consistent with the previous studies on similar superlattices. 12,13 Interestingly, the substitution to the latticematched LSAT substrate significantly increases M. The overall feature of the ͓La3, Sr2͔ superlattice on LSAT becomes equivalent to the ferromagnetic LSMO ͑x = 0.4͒ film, as characterized by the large spontaneous M ͑ϳ3 B / Mn-site͒. The enhanced ferromagnetism is also observed in the ͓La6, Sr4͔ superlattice.…”

Interfacial Control of Magnetic Properties at LaMnO3/LaNiO3 Interfaces

“…The result is often the existence of interfacial transition layers with novel physical properties different from the bulk material ones. [3][4][5][6] The potential to design and control reconstructions of the different degrees of freedom (charge, spin, orbital, lattice) is a recognized strategy to tailor the electronic properties of these artificial materials.…”

Effect of strain on the orbital and magnetic ordering of manganite thin films and their interface with an insulator

“…[10][11][12][13][14][15][16][17][18][19][20][21][22] In different all-manganite heterostructures, it has been observed that the properties of thin manganite layers may be modified with respect to their bulk behavior, for instance, by the appearance of a ferromagnetic moment in a nominally antiferromagnetic manganite 15,16,22 or by the formation of a ferromagnetic two dimensional electron gas at the interface between two antiferromagnetic insulating manganites. [10][11][12]14,[17][18][19][20] Orbital reconstruction, a modification of the orbital occupancy at interfaces between different materials, has also been observed.…”