Low-field magnetoresistance of (1-
 x
 )La
 0.7
 Ca
 0.3
 MnO
 3
 +
 x
 La
 1.5
 Sr
 0.5
 NiO
 4
 nanocomposite

Tran, Dinh Nam; Nguyen, Thi Ha; Manh, Do Hung; Vu, Dinh Lam; Phan, The‐Long; Yu, Seong‐Cho

doi:10.1088/2043-6262/4/3/035001

Adv. Nat. Sci: Nanosci. Nanotechnol.

2013

DOI: 10.1088/2043-6262/4/3/035001

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Low-field magnetoresistance of (1- x )La _0.7 Ca _0.3 MnO ₃ + x La _1.5 Sr _0.5 NiO ₄ nanocomposite

Dinh Nam Tran

Thi Ha Nguyen

Do Hung Manh

et al.

Abstract: In this report we present low-field magnetoresistance (LFMR) of (1 − x)La0.7Ca0.3MnO3 + xLa1.5Sr0.5NiO4 (x =0–0.3) nanocomposites at temperatures ranging from 30 to 300 K. These materials were synthesized by reactive mechanical ball milling combined with the heat treatment. Experimental results have revealed that the Curie temperature is almost independent of x, while the metal–insulator transition temperature shifts from 254 K for x = 0.0 to 65 K for x = 0.2. Particularly, the samples with x ⩾ 0.25 exhibit i… Show more

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“…We have focused on the (La,Sr)MnO3 (LSMO)-silica system because the introduction of the insulating silica phase at the grain boundaries of polycrystalline metallically conducting manganite promotes the spin-polarized tunneling between neighboring perovskite grains [44][45][46][47][48][49][50][51]. The macroscopic transport is consequently strongly dependent on external magnetic field, which makes such composites promising for spintronic devices.…”

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View point on hydrothermal sintering: Main features, today's recent advances and tomorrow's promises

et al. 2019

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The development of new high performance materials faces the challenge of implementing low temperature densification processes to overcome current technological limitations. In this context, the hydrothermal sintering, inspired by the natural processes of geological and biological mineralization, has recently emerged as a major opportunity to develop new and/or optimized materials that respond to today's scientific, technological and related socioeconomic issues. The purpose of this viewpoint paper is to present opinions and propose future outlook for hydrothermal sintering based on the most recent achievements.

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View point on hydrothermal sintering: Main features, today's recent advances and tomorrow's promises

et al. 2019

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“…For instance, the introduction of an insulating phase at the grain boundaries in polycrystalline metallically conducting manganites with (La, Sr)MnO 3 (LSMO) or (La, Ca)MnO 3 (LCMO) compositions promotes the role of tunneling of spin-polarized carriers between neighboring perovskite grains [1][2][3][4][5][6][7][8].…”

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Design of 0–3 type nanocomposites using hydrothermal sintering

et al. 2018

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We report here the successful design of 0-3 type nanocomposites where 30 nm ferromagnetic metallically conducting cores of manganite La 0.66 Sr 0.34 MnO 3 (LSMO) are discretely distributed in an insulating silica matrix. Starting from LSMO@SiO 2 core@shell nanoparticles, hydrothermal sintering process was used as a low temperature densification route (300 °C, 350 MPa, 90 min) in presence of 0.2M aqueous sodium hydroxide solution. This process based on a pressure solution creep in the contact zones between nanoparticles allows the design of complex microstructures preventing the grain growth of the cores and the formation of interphases between the cores and the matrix.

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Large, Temperature‐Tunable Low‐Field Magnetoresistance in La_0.7Sr_0.3MnO₃:NiO Nanocomposite Films Modulated by Microstructures

Ning

Wang

Zhang

2014

Adv Funct Materials

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5393www.MaterialsViews.com wileyonlinelibrary.com environment. [ 9,10 ] Recently, due to the deepening cognition of the intrinsic and extrinsic GMR effect, growing attention has been paid to polycrystalline manganites to obtain the extrinsic low-fi eld magnetoresistance (LFMR) by structuring grain boundaries, nanosized inclusions, interface phase, and artifi cial grain boundaries. What's more, the LFMR in composites or fi lms can be further improved by introducing a secondary phase (usually non-magnetic or antiferromagnetic insulators). [11][12][13][14][15][16][17][18][19][20] For example, the LFMR values of -6% at 5 K and 0.16 T in LSMO:SrTiO 3 superlattice structure, [ 3 ] -17.5% at 30 K and 1 T in LSMO:ZnO columnar structure, [ 21 ] -8% at 10-150 K and 1 T in LSMO:MgO nanorod arrays structure [ 22 ] and -12% at 77 K and 0.4 T in LSMO:Ag 0-3 structure [ 23 ] have been reported. However, neither the early results obtained from LSMO polycrystalline fi lms [ 24 ] or recent results obtained from LSMO:ZnO composite fi lms with a columnar structure, [ 21 ] enhanced LFMR values are always display in a low temperature range. That may be due to the large grain size in polycrystalline fi lms (≈µm) or weak spin coupling at the phase boundaries in the composite thin fi lms. Systems featuring a large LFMR at temperatures close to or even higher than room temperature are also interesting owing to their potential applications in magnetic fi eld sensing and data storage. [ 25 ] Dey et al. have found that the large LFMR will keep steady in a higher temperature range when the grain size is in nanoscale and gets pronounced with the decrease in particle size. [ 26 ] It is notable that the spin pinned effect occurs at the nanosized grain surface defect sites or spin coupling at the boundaries. [ 26,27 ] In addition, the short range ferromagnetic (FM) coupling order may add the opportunity of spin scattering even near the Curie temperature. [ 28,29 ] Thus it is speculated that the high-temperature LFMR in LSMO composite fi lms can be got through tuning the grain size and the FM coupling at the phase boundary. MacManus-Driscoll et al. proposed that the self-assembled composite fi lms are free from substrate clamping constraints and form strained vertical interface areas which can be used to tune the FM coupling by another phase and also can provide a more fl exible way to control the growth of the fi lms which can be used to control the grain size to get enhanced physical properties. [ 30 ] To prepare the LSMO-based composite fi lms, on the one hand, it should NiO nano composite thin fi lms, which will be expected to be applied in the devices using for a wide temperature range.

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Low-field magnetoresistance of (1- x )La _0.7 Ca _0.3 MnO ₃ + x La _1.5 Sr _0.5 NiO ₄ nanocomposite

Cited by 3 publications

References 18 publications

View point on hydrothermal sintering: Main features, today's recent advances and tomorrow's promises

View point on hydrothermal sintering: Main features, today's recent advances and tomorrow's promises

Design of 0–3 type nanocomposites using hydrothermal sintering

Large, Temperature‐Tunable Low‐Field Magnetoresistance in La_0.7Sr_0.3MnO₃:NiO Nanocomposite Films Modulated by Microstructures

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Low-field magnetoresistance of (1- x )La 0.7 Ca 0.3 MnO 3 + x La 1.5 Sr 0.5 NiO 4 nanocomposite

Cited by 3 publications

References 18 publications

View point on hydrothermal sintering: Main features, today's recent advances and tomorrow's promises

View point on hydrothermal sintering: Main features, today's recent advances and tomorrow's promises

Design of 0–3 type nanocomposites using hydrothermal sintering

Large, Temperature‐Tunable Low‐Field Magnetoresistance in La0.7Sr0.3MnO3:NiO Nanocomposite Films Modulated by Microstructures

Contact Info

Product

Resources

About

Low-field magnetoresistance of (1- x )La _0.7 Ca _0.3 MnO ₃ + x La _1.5 Sr _0.5 NiO ₄ nanocomposite

Large, Temperature‐Tunable Low‐Field Magnetoresistance in La_0.7Sr_0.3MnO₃:NiO Nanocomposite Films Modulated by Microstructures