Enhanced low field magnetoresistive response in (La2/3Sr1/3MnO3)x/(CeO2)1−x composite thick films prepared by screen printing

València, S.; Castaño, Óscar; Fontcuberta, J.; Martı́nez, B.; Balcells, Ll.

doi:10.1063/1.1589174

Cited by 24 publications

(17 citation statements)

References 22 publications

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“…[1][2][3][4] In addition to the intrinsic MR effect, polycrystalline samples display an extrinsic MR effect due to the presence of grain boundaries. [3][4][5][6] Several groups 7,8 have shown that the extrinsic MR is enhanced by preparing composites of a magnetoresistive manganite and an insulating secondary phase. The insulating phase acts as an additional barrier to the conduction at the grain boundaries and increases the percolating conduction path.…”

Section: Introductionmentioning

confidence: 99%

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Mucha

Vertruyen

Misiorek

et al. 2009

Journal of Applied Physics

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We report the temperature dependence of the thermal conductivity ͑T͒ of bulk polycrystalline composite samples containing a magnetoresistive manganite ͑La 0.7 Ca 0.3 MnO 3 ͒ and an electrically insulating phase ͑Mn 3 O 4 ͒. The sample porosity is shown to be a significant parameter affecting the experimental data: after porosity correction the curves display the characteristics of an ideal composite. A fit of the ͑T͒ curves at low temperature using the Debye model enables the mean free path of phonons scattered on "boundaries" to be determined. The values are on the order of the grain size but are influenced by the grain arrangement and the presence of twins.

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Section: Introductionmentioning

confidence: 99%

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Mucha

Vertruyen

Misiorek

et al. 2009

Journal of Applied Physics

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“…Recently, the enhanced LFMR effects in the LSMOinsulating oxide composite films have also been reported in the literature [19][20][21][22][23][24][25][26]. However, reported LFMR values of the composite films were less that 1% at room temperature and thus insufficient for real applications, which motivated present study.…”

Section: Introductionmentioning

confidence: 47%

Enhanced Low-field Magnetoresistance of La_0.7Sr_0.3Mn_1+dO₃-Mn₃O₄Composite Films Prepared by ex-situ Solid Phase Crystallization

Kang¹,

Kim²,

Yoo³

2012

Journal of Magnetics

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We report improved low-field magnetoresistance (LFMR) effects of the La 0.7 Sr 0.3 Mn 1+d O 3 -Mn 3 O 4 composite films with the nominal composition of La 0.7 Sr 0.3 MnO 3 (LSMO)-50 mol% Mn 3 O 4 . The composite films were fabricated by ex-situ solid phase crystallization (SPC) of amorphous films at the annealing temperature region of 900-1100 o C for 2 h in a pure oxygen atmosphere. The amorphous films were deposited on polycrystalline BaZrO 3 (poly-BZO) substrates by dc-magnetron sputtering at room temperature. The Curie temperatures (T C ) of all composite films were insignificantly altered in the range of 368-372 K. The highest LFMR value of 1.29 % in 0.5 kOe with the maximum dMR/dH value of 37.4%kOe −1 at 300 K was obtained from 900 nm-thick composite film annealed at 1100 o C. The improved LFMR properties of the composite films are attributed to effective spin-dependent scattering at the La 0.7 Sr 0.3 Mn 1+d O 3 grain boundaries sharpened by adjacent chemically compatible Mn 3 O 4 grains.

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“…In the families of compounds here discussed (manganites and FeMo double perovskites) we have shown [19] that a double exchange mechanism operates. That means that the ferromagnetic coupling between the orientations of localized atomic moments (S=3/2 in 3d 3 in manganites or S=5/2 in 3d 5 in SFMO) is mediated by the itinerant carriers of the conduction band.…”

Section: Is There a Chance For Further Rising Of The Curie Temperature?mentioning

confidence: 99%

Cerámicas magnetorresistivas. Progresos recientes: desde el entendimiento básico a las aplicaciones

Fontcuberta¹,

Balcells²,

Navarro³

et al. 2004

Bol. Soc. Esp. Ceram. Vidr.

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Magnetoresistive ceramics, based on half-metallic ferromagnetic oxides have received renewed attention in the last few years because of their possible applications. Here, we review some recent progress on the development of magnetoresistive ceramic materials such as La 2/3 Sr 1/ 3 MnO 3 and Sr 2 FeMoO 6 ceramic materials. We shall revisit their basic properties, the strategies that have been employed to understand and to improve their intrinsic properties, pushing the limits of their operation at temperatures well above room-temperature, and the development of some applications. This effort has required the contribution of a number of actors. Starting from research laboratories, it has progressively involved industries that nowadays are able to supply high quality raw-materials or to manufacture magnetoresistive components at large scale. Keywords: magnetoresistive ceramics, manganese oxides, magnetic sensorsCerámicas magnetorresistivas. Progresos recientes: desde el entendimiento básico a las aplicaciones.Las cerámicas magnetorresistivas, basadas en óxidos semi-metálicos ferromagnéticos han recibido una renovada atención en los últimos años debido a sus posibles aplicaciones. Se revisan aquí algunos de los recientes progresos en el desarrollo de materiales cerámicos magnetorresistivos como La 2/3 Sr 1/3 MnO 3 y Sr 2 FeMoO 6 . Se revisitan sus propiedades básicas, las estrategias empleadas para entender y mejorar sus propiedades intrínsecas, llevando sus límites de operación a temperaturas muy por encima de temperatura ambiente, y el desarrollo de algunas aplicaciones. Este esfuerzo ha requerido al contribución de un gran número de actores. Comenzando por laboratorios de investigación, se ha implicado progresivamente a industrias que hoy en día están capacitadas para suministrar materias primas de alta calidad o para fabricar componentes magnetorresistivos a gran escala. Palabras clave: cerámicas magneto-resistivas, óxidos de manganeso, sensores magnéticos

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Enhanced low field magnetoresistive response in (La2/3Sr1/3MnO3)x/(CeO2)1−x composite thick films prepared by screen printing

Cited by 24 publications

References 22 publications

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Enhanced Low-field Magnetoresistance of La_0.7Sr_0.3Mn_1+dO₃-Mn₃O₄Composite Films Prepared by ex-situ Solid Phase Crystallization

Cerámicas magnetorresistivas. Progresos recientes: desde el entendimiento básico a las aplicaciones

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Enhanced low field magnetoresistive response in (La2/3Sr1/3MnO3)x/(CeO2)1−x composite thick films prepared by screen printing

Cited by 24 publications

References 22 publications

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Influence of microstructure on the thermal conductivity of magnetoresistive La0.7Ca0.3MnO3/Mn3O4 manganite/insulating oxide polycrystalline bulk composites

Enhanced Low-field Magnetoresistance of La0.7Sr0.3Mn1+dO3-Mn3O4Composite Films Prepared by ex-situ Solid Phase Crystallization

Cerámicas magnetorresistivas. Progresos recientes: desde el entendimiento básico a las aplicaciones

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Enhanced Low-field Magnetoresistance of La_0.7Sr_0.3Mn_1+dO₃-Mn₃O₄Composite Films Prepared by ex-situ Solid Phase Crystallization