Lattice-strain-driven ferromagnetic ordering in La0.8Sr0.2MnO3 thin films

Lee, Y. P.; Park, S. Y.; Prokhorov, V. G.; Komashko, V. A.; Svetchnikov, V. L.

doi:10.1063/1.1645329

Cited by 21 publications

(14 citation statements)

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“…Similar effects were observed in bilayered and multilayered manganite films which manifest not only a significant enhancement of the ferromagnetic ordering in the low-T C layers, but show the anisotropy of saturation magnetization and the alternating shape of the temperaturedependent anisotropic magnetoresistance near the metalinsulator transition [5][6][7][8][9]. In spite of that a magnetic proximity effect have already been studied for a long time, the physical nature is still poorly understood.…”

Section: Tsupporting

confidence: 53%

Magnetic proximity effect in Pr0.5Ca0.5MnO3/La0.7Sr0.3MnO3 bilayered films

Prokhorov

Kaminsky

Flis

et al. 2012

Low Temperature Physics

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substrate by pulse laser deposition have been investigated. The x-ray diffraction and high-resolution electron-microscopy analysis reveals that lattice parameters for the constituent sublayers in the bilayer are very close to that for the individual films. It was found that a ferromagnetic transition in the La 0.7 Sr 0.3 MnO 3 sublayer significantly modifies the magnetotransport properties of the Pr 0.5 Ca 0.5 MnO 3 constituent sublayer, owing to occurrence of a magnetic proximity effect. The main evidences for this effect are an appearance of the exchange bias interaction between the constituent sublayers; a localizedto-itinerant crossover in the system of polarized electrons, which results in formation of the Griffiths-like ferromagnetic state; and an unusual polaron transport of carriers. The experimental results have been analyzed within the framework of modern theoretical approaches. PACS

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Section: Tsupporting

confidence: 53%

Magnetic proximity effect in Pr0.5Ca0.5MnO3/La0.7Sr0.3MnO3 bilayered films

Prokhorov

Kaminsky

Flis

et al. 2012

Low Temperature Physics

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“…The observed discrepancy is mainly explained by the lattice strain, due to the epitaxial growth of the film, which greatly affects the formation of the spin-ordered state and the value of the CMR effect. [4][5][6][7][8][9][10][11][12] It was argued that, for example, a lattice compression would reduce the electron-phonon interaction and increase the electronic hopping probability by decreasing the Mn-O bond length and increasing the Mn-O-Mn bond angle, all leading to an increase of the Curie temperature ͑T C ͒. In contrast, the Jahn-Teller distortion induces a localization of electrons and reduces T C .…”

Section: Introductionmentioning

confidence: 99%

Microstructural and magnetotransport properties ofLa0.7Ca0.3MnO3∕BaTi
Lee
¹
,
Park
²
,
Hyun
³

et al. 2006
Phys. Rev. B
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The microstructural and the magnetotransport properties of La 0.7 Ca 0.3 MnO 3 and La 0.7 Sr 0.3 MnO 3 films, deposited on a BaTiO 3 layer ͑LCMO/BTO and LSMO/BTO, respectively͒, and on LaAlO 3 and SrTiO 3 ͑001͒ single crystals ͑LCMO/LAO, LSMO/LAO and LSMO/STO͒ by rf-magnetron sputtering using the "soft" ͑or powder͒ targets, have been investigated. The films grown on BTO demonstrate biaxial tensile in-plane and compressive out-of-plane strains, while those grown on LAO show the opposite trend, i.e., compressive in-plane and tensile out-of-plane strains. The films with a biaxial tensile in-plane strain undergo the magnetic transition at a higher temperature than those with a biaxial compressive one. This implies that the variation of Mn-O-Mn bond angle, controlled by the lattice strain, plays a more important role in the formation of spin ordering in the manganite film than the modification in the Mn-O bond length does. It was shown that the magnetic inhomogeneity, observed through the difference between field-cooled and zero-field-cooled temperature-dependent magnetization, is not greatly relevant to the electronic nature, but is controlled by the lattice distortion and the microstructural defects. The observed enhancement of magnetoresistance for the LSMO/BTO bilayer at room temperature makes this material system promising in the development of new hybrid ferromagnetic/ferroelectric devices.

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“…Extensive studies have been carried out on thin films of La 1−x Sr x MnO 3 . [39][40][41][42][43][44][45][46][47][48][49][50][51][52] The effects of strainfilm-thickness-induced modifications in various physical properties, such as magnetotransport and magnetic properties, [44][45][46][47][48][49][50][51][52][53][54][55][56][57] magnetic anisotropy, 39,40 optical properties, 40,50 and conduction noise, 38 have been investigated. However, nearly all of the studies related to the effect of strain have focused on La 1−x Sr x MnO 3 with a doping level of x ϳ 0.3 in which the one electron ͑e g ͒ bandwidth is large.…”

Section: Introductionmentioning

confidence: 99%

Thickness dependent transport properties of compressively strained La0.88Sr0.12MnO3 ultrathin films

Prasad

Singh

et al. 2008

Journal of Applied Physics

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Thickness dependent magnetic and transport properties of compressively strained La 0.88 Sr 0.12 MnO 3 thin films grown on single crystalline SrTiO 3 ͑100͒ substrates have been studied. All films exhibit a large enhancement of ϳ130 K in T C / T IM as compared to that of the bulk target ͑T C ϳ 175 K͒. This has been explained in terms of suppression of the cooperative Jahn-Teller distortion due to in-plane compressive strain. The T C / T IM of the 5 nm film is 315 K/318 K and slightly increases for film thicknesses Յ25 nm. At higher film thicknesses, ϳ60 nm, the T C / T IM starts decreasing. At T Ͼ T IM , the electrical transport is due to thermally activated hopping of small polarons. The activation energy is found to be sensitive to film thickness and shows a minimum at around L ϳ 15-25 nm, which corresponds to the maximum of T C / T IM . All films possess large magnetoresistances ͑MRs͒ in the vicinity of room temperature. Low as well as high field MRs are observed to nearly double as the film thickness increases from 5 nm ͑MRϳ 28% / 3 T͒ to 60 nm ͑MR% ϳ 50% / 3 T͒. Thicker films ͑L Ն 25 nm͒ are found to exhibit sufficiently large temperature coefficients of resistivities, ϳ4% -5% / K, which could be suitable for bolometric applications.

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Lattice-strain-driven ferromagnetic ordering in La0.8Sr0.2MnO3 thin films

Cited by 21 publications

References 14 publications

Magnetic proximity effect in Pr0.5Ca0.5MnO3/La0.7Sr0.3MnO3 bilayered films

Magnetic proximity effect in Pr0.5Ca0.5MnO3/La0.7Sr0.3MnO3 bilayered films

Microstructural and magnetotransport properties ofLa0.7Ca0.3MnO3∕BaTi
Lee
¹
,
Park
²
,
Hyun
³

et al. 2006
Phys. Rev. B
Self Cite
50
3
21
0
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Thickness dependent transport properties of compressively strained La0.88Sr0.12MnO3 ultrathin films

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Lattice-strain-driven ferromagnetic ordering in La0.8Sr0.2MnO3 thin films

Cited by 21 publications

References 14 publications

Magnetic proximity effect in Pr0.5Ca0.5MnO3/La0.7Sr0.3MnO3 bilayered films

Magnetic proximity effect in Pr0.5Ca0.5MnO3/La0.7Sr0.3MnO3 bilayered films

Microstructural and magnetotransport properties ofLa0.7Ca0.3MnO3∕BaTiLee1, Park2, Hyun3 et al. 2006Phys. Rev. BSelf Cite503210View full textAdd to dashboardCite

Thickness dependent transport properties of compressively strained La0.88Sr0.12MnO3 ultrathin films

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Microstructural and magnetotransport properties ofLa0.7Ca0.3MnO3∕BaTi
Lee
¹
,
Park
²
,
Hyun
³

et al. 2006
Phys. Rev. B
Self Cite
50
3
21
0
View full text Add to dashboard Cite