The effect of NiO doping on the structure, magnetic and magnetotransport properties of La0.8Sr0.2MnO3 composite

Eshraghi, M.; Salamati, H.; Kameli, P.

doi:10.1016/j.jallcom.2006.07.104

Cited by 37 publications

(16 citation statements)

References 29 publications

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“…[ 53 ] It should be noted that the decrease of T C can be explained by other reasons, such as the small radial grain size or the ultra-thin thickness of the shell-LSMO, Ni-O-Mn magnetic interaction at the interface. [ 54,55 ] Moreover, the NiO nanoparticles increase the magnetically disordered states and change the Mn-O-Mn bond length and angle, and therefore the exchange energy decreases. The magnetic hysteresis loops normalized by the maximal magnetization at 5 K , recorded after fi eld cooling (FC) at 0.4 T from 340 K down to the measurement temperature, are shown in Figure 5 b.…”

Section: Resultsmentioning

confidence: 99%

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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Section: Resultsmentioning

confidence: 99%

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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“…The enhanced low-field magnetoresistance (LFMR) is generally thought to be extrinsic in nature and ascribed to the spin-polarized tunneling of conduction electrons through grain boundaries as proposed by Hwang et al [9]. These secondary insulators include Co 3 O 4 [10], glass [11], MgO [12], CuO [13], V 2 O 5 [14], ZrO 2 [15], Fe 2 O 3 [16], NiO [17], PMMA [18] and CuMn 2 O 4 [19]. These results suggest that the insulating boundary or the barrier layer is important to enhance the MR effect.…”

Section: Introductionmentioning

confidence: 99%

Electrical transport and magnetic properties in La0.7Sr0.3MnO3 and SrFe12O19 composite system

Sun

Zhu

et al. 2009

Journal of Alloys and Compounds

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“…Nowadays, researchers are focusing on how to obtain a large value of the MR at a low field and room temperature in order to satisfy practical applications. Many attempts have been made to enhance the low field magnetoresistance (LFMR) effect of perovskite manganites by mixture of the CMR materials with secondary phases including insulators [3][4][5][6][7][8], magnetic materials [9][10][11][12][13][14], or metals [14][15][16][17][18][19]. However, the mixture of the CMR material with the insulating grains commonly results in large increase of resistivity and downshift of metal-insulator transition, which limits the practical applications for the circuitmatching requirement.…”

Section: Introductionmentioning

confidence: 99%

Electrical properties and enhanced room temperature magnetoresistance in (La0.7Ca0.2Sr0.1MnO3)1−x/Pdx composites

Xiong¹,

Hu²,

Xiong³

et al. 2009

Journal of Alloys and Compounds

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The effect of NiO doping on the structure, magnetic and magnetotransport properties of La0.8Sr0.2MnO3 composite

Cited by 37 publications

References 29 publications

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

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

Electrical transport and magnetic properties in La0.7Sr0.3MnO3 and SrFe12O19 composite system

Electrical properties and enhanced room temperature magnetoresistance in (La0.7Ca0.2Sr0.1MnO3)1−x/Pdx composites

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The effect of NiO doping on the structure, magnetic and magnetotransport properties of La0.8Sr0.2MnO3 composite

Cited by 37 publications

References 29 publications

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

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

Electrical transport and magnetic properties in La0.7Sr0.3MnO3 and SrFe12O19 composite system

Electrical properties and enhanced room temperature magnetoresistance in (La0.7Ca0.2Sr0.1MnO3)1−x/Pdx composites

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

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