http://www.cnr.it/ontology/cnr/individuo/prodotto/ID58426

Magnetic properties and orbital anisotropy driven by Mn(2+) in nonstoichiometric La(x)MnO(3-delta) thin films (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Magnetic properties and orbital anisotropy driven by Mn(2+) in nonstoichiometric La(x)MnO(3-delta) thin films (Articolo in rivista) (literal)

Anno

2011-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1103/PhysRevB.83.064418 (literal)

Alternative label

Galdi, A; Aruta, C; Orgiani, P; Brookes, NB; Ghiringhelli, G; Moretti Sala, M; Mangalam, RVK; Prellier, W; Luders, U; Maritato, L (2011)
Magnetic properties and orbital anisotropy driven by Mn(2+) in nonstoichiometric La(x)MnO(3-delta) thin films
in Physical review. B, Condensed matter and materials physics; American Physical Society (APS), College Pk (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

Galdi, A; Aruta, C; Orgiani, P; Brookes, NB; Ghiringhelli, G; Moretti Sala, M; Mangalam, RVK; Prellier, W; Luders, U; Maritato, L (literal)

Pagina inizio

064418-1 (literal)

Pagina fine

064418-8 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://prb.aps.org/abstract/PRB/v83/i6/e064418 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

83 (literal)

Rivista

Physical review. B, Condensed matter and materials physics (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

8 (literal)

Note

Scopu (literal)
ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

CNR, SPIN, I-84084 Fisciano, SA, Italy. Univ Salerno, Dipartimento Fis ER Caianiello, I-84084 Fisciano, SA, Italy. CNR, SPIN, I-80126 Naples, Italy. Univ Salerno, Dipartimento Matemat & Informat, I-84084 Fisciano, SA, Italy. European Synchrotron Radiat Facil, F-38043 Grenoble, France. CNR, SPIN, I-20133 Milan, Italy. Politecn Milan, Dipartimento Fis, I-20133 Milan, Italy. CNR, IOM, I-20133 Milan, Italy. ENSICAEN, CNRS, Lab CRISMAT, UMR 6508, F-14050 Caen, France. (literal)

Titolo

Magnetic properties and orbital anisotropy driven by Mn(2+) in nonstoichiometric La(x)MnO(3-delta) thin films (literal)

Abstract

Magnetic measurements by complementary techniques have shown that the substitution of Mn2+ in the A site strongly influences the electronic and magnetic properties of nonstoichiometric LaxMnO3-delta thin films (x = 0.66 -> 1.07). We have studied a series of samples deposited on SrTiO3 (100) substrates by molecular beam epitaxy. SQUID magnetometer has been used to measure the dependence of magnetization on temperature and applied magnetic field between 400 K and 10 K. Mn L-2,L-3 x-ray absorption spectra (XAS) have revealed the presence of Mn2+ in the samples with smaller x, which are ferromagnetic. The dependence of XAS on linear polarization (linear dichroism) has revealed the magnetic anisotropy and the orbital preferential occupation as a function of x. Magnetic hysteresis loops and magnetic circular dichroism have allowed us to determine the ferromagnetic easy axis and the presence of a second coercive field in some of the samples. O K edge XAS has provided an insight into the band hybridization as a function of the La/Mn ratio and Mn2+ content. The experimental results reveal the double role of divalent Mn in these films. For x << 1 the Mn2+ ions at the A site stabilize to a robust ferromagnetic phase (T-C similar or equal to 350 K) and influence the orbital occupation of Mn3+ at the B site in the residual antiferromagnetic phase. These results indicate that substitution of La3+ with a magnetic divalent ion (Mn2+) gives rise to structural distortions overcoming the uniaxial strain induced by the substrate and to an unexpectedly strong superexchange interaction between A and B sites. (literal)

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