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In-plane anisotropy in the magnetic and transport properties of manganite ultrathin films (Articolo in rivista)

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In-plane anisotropy in the magnetic and transport properties of manganite ultrathin films (Articolo in rivista) (literal)

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P.Orgiani; A.Yu.Petrov; C.Adamo; C.Aruta; C.Barone; G.M.De Luca; A.Galdi; M.Polichetti; D.Zola; L.Maritato (2006)
In-plane anisotropy in the magnetic and transport properties of manganite ultrathin films
in Physical review. B, Condensed matter and materials physics; American Physical Society (APS), College Pk (Stati Uniti d'America)
(literal)

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P.Orgiani; A.Yu.Petrov; C.Adamo; C.Aruta; C.Barone; G.M.De Luca; A.Galdi; M.Polichetti; D.Zola; L.Maritato (literal)

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Univ Salerno, CNR, INFM, I-84081 Baronissi, Italy Univ Salerno, Dept Phys, I-84081 Baronissi, Italy (literal)

Titolo

In-plane anisotropy in the magnetic and transport properties of manganite ultrathin films (literal)

Abstract

To analyze the conducting and magnetic properties near the film and substrate interface in manganites, ultrathin films (thickness <= 100 A) of La0.7Sr0.3MnO3 were epitaxially grown by molecular-beam epitaxy on single-crystal (001) LaAlO3, (110) NdGaO3, and (001) SrTiO3 substrates. Structural, magnetic, and magnetoresistive properties were investigated. All samples exhibit a substrate-independent decrease of the c-lattice parameter for thinnest films. Highly anisotropic behavior in both transport and magnetic properties were measured along the in-plane directions parallel to the substrate crystallographic axes. In particular, for the thinnest films (60 A), the negative magnetoresistance at about 120 K with the average current along one of the crystallographic directions, is larger than the room-temperature colossal value. In the same low-temperature range, with the current along the other in-plane crystallographic direction, the magnetoresistance changes sign (resulting to be magnetic field independent for T similar to 150 K). Such an in-plane anisotropy of transport and magnetic properties is investigated with respect to possible intrinsic and extrinsic physical mechanisms. (literal)

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