Size effects and interactions in La0.7Ca0.3MnO3 nanoparticles

Manh, Do Hung; Phong, P.T.; Thành, Trần Đăng; Nam, D. N. H.; Hong, Le Van; Phuc, N.X.

doi:10.1016/j.jallcom.2010.10.104

Cited by 46 publications

(23 citation statements)

References 34 publications

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“…Also, a transition in the range of magnetic interactions from long range to short range has been noticed. A similar variation in the magnetic properties with a decrease in particle size has been previously reported in the case of manganites [28,71,73,[85][86][87][88] and other oxides [89][90][91][92]. The observed characteristic could be accounted for by considering the core-shell structure of the nanoparticles [93], according to which each nanoparticle has a FM/AFM grain surrounded by a nonmagnetic shell comprised of broken bonds and randomly oriented magnetic spins.…”

Section: S H Tsupporting

confidence: 75%

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Finite-size effects on the evolution of magnetic correlations and magnetocaloric properties of Pr0.4Bi0.2Sr0.4MnO3

2021

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The effect of particle size reduction on the magnetic correlations of Pr0.4Bi0.2Sr0.4MnO3 nanoparticles prepared by top-down approach has been studied in detail. It was observed that as the milling time increases from 0 to 240 min, particle size decreases from 160 to 12 nm. Correspondingly it was observed that the ferromagnetic transition temperature (TC) drops (264 to 213 K) and saturation magnetization (MS) decreases (2.12–0.41 $${\upmu }_{\mathrm{B}}/\mathrm{f}.\mathrm{u}.$$ μ B / f . u . ) while coercivity (HC) shows a monotonous increase (0.18–1.5 kOe) as the particle size decreases due to increase in milling. The magnetic entropy change (ΔS) also decreases (2.41–0.24 J/kg-K) as particle size decreases indicating a strong correlation between magnetism and particle size. The metamagnetic M–H response of the bulk sample, which signifies the magnetic phase coexistence, is suppressed, and the nature of magnetic interactions demonstrates a transition from long range to short range. The observed characteristics emphasizes that with particle size reduction there is an increase in the surface disorder which can be explained by considering the core–shell model for the nanoparticles. Graphic abstract

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Section: S H Tsupporting

confidence: 75%

“…given to the demagnetization curves in the first quadrant provide more insights into the magnetic behaviour. The term M S in the above relation refers to the saturation magnetization, a/H corresponds to the structural defects while b/H 2 is related to the uniaxial magneto-crystalline anisotropy given as [73]…”

Section: Magnetization Studiesmentioning

confidence: 99%

Finite-size effects on the evolution of magnetic correlations and magnetocaloric properties of Pr0.4Bi0.2Sr0.4MnO3

2021

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“…2 In the doping range 0.25 < x < 0.33, La 1Àx Ca x MnO 3 exhibits a paramagnetic to ferromagnetic (PM-FM) transition between 230 K and 260 K concurrent with the insulator to metal transition. This critical temperature and doping range are characterized by colossal magnetoresistance (CMR) and a large magnetocaloric effect (MCE), prompting many studies focused on understanding the underlying transport and magnetic properties in thin films, [3][4][5][6][7][8] bulk, 9,10 and nanocrystalline [11][12][13][14] variations of La 1Àx Ca x MnO 3 .…”

mentioning

confidence: 99%

“…12,13 Experimental data agree well with models predicting a core/shell morphology in which the shell consists of a magnetically dead or spin glass-like surface layer, with the effect of reducing the magnetization. 11,15 Meanwhile, finite size effects (cutoff of the correlation length) in the magnetic core of the particle contribute to the suppression of T C . 14 To our knowledge, no study has been carried out with a side-by-side comparison of the effects of extrinsic disorder in thin films and finite size effects in nanoparticles on the magnetic and magnetocaloric properties of a single ferromagnetic manganite system.…”

mentioning

confidence: 99%

Impact of reduced dimensionality on the magnetic and magnetocaloric response of La0.7Ca0.3MnO3

Lampen¹,

Bingham²,

Phan³

et al. 2013

Applied Physics Letters

138

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Understanding the impact of reduced dimensionality on the magnetic and magnetocaloric responses of a material is vital in incorporating it as an active magnetic refrigerant in cooling devices. By contrasting the magnetic and magnetocaloric behaviors of bulk polycrystalline, sol-gel derived nanocrystalline, and pulsed laser deposited thin film forms of the La 0.7 Ca 0.3 MnO 3 system, we show that reducing the dimensionality of a ferromagnetic material tends to broaden and shift the paramagnetic to ferromagnetic transition to lower temperatures, while decreasing the saturation magnetization and the magnitude of the magnetic entropy change. Relative to its bulk counterpart, a pronounced broadening of the magnetic entropy change peak in the thin film leads to enhanced refrigerant capacity-an important figure-of-merit for active magnetic refrigeration technology. With reduced dimensionality, universal curves based on re-scaled entropy change curves tend toward collapse, indicating a weakening of the first order nature of the transition in the nanocrystalline samples and a crossover to second order in the thin film. V

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“…Further using the law of approach to saturation (LAS) fit [38][39][40]55] given to the demagnetization curves in the first quadrant (Supplementary file SI), an estimate of M S , uniaxial magnetocrystalline anisotropy parameter (K) [56], and structural defects parameter (a/H) has been obtained. The LAS fit given to the M-H data at 3 K and the fitting parameters are described in the supplementary file (SI).…”

Section: Magnetization Studiesmentioning

confidence: 99%

Tuning magnetic and magnetocaloric properties of Pr0.6Sr0.4MnO3 through size modifications

Souza

Vagadia

Daivajna

2021

J Mater Sci: Mater Electron

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Particle size as an effective tool for controlling the magnetic and magnetocaloric properties of Pr0.6Sr0.4MnO3 samples has been studied. In the present work, a direct influence of particle size on the magnitude of magnetization and magnetic transition temperature, TC, can be seen. The TC drops from 309 to 242 K, while the saturation magnetization (MS) decreases from 3.6 to 0.5 μB/f.u. as the particle changes from 120 to 9 nm. Concurrently, coercivity (HC) exhibits a drastic rise emphasizing the enhanced surface disorder in the nanoparticles. Another interesting observation is in the magnetic entropy change, ΔS, which though decreases in magnitude from 5.51 to 3.90 J/Kg-K as particle size decreases from 120 to 30 nm, but the temperature range of ΔS (i.e., relative cooling power, RCP) increases from 184.33 to 228.85 J/Kg. Such interplay between magnitude and wider temperature range of ΔS, which can be fine-tuned by particle size, provides an interesting tool for using surface spin disorder, as a control mechanism in modifying physical properties.

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Size effects and interactions in La0.7Ca0.3MnO3 nanoparticles

Cited by 46 publications

References 34 publications

Finite-size effects on the evolution of magnetic correlations and magnetocaloric properties of Pr0.4Bi0.2Sr0.4MnO3

Finite-size effects on the evolution of magnetic correlations and magnetocaloric properties of Pr0.4Bi0.2Sr0.4MnO3

Impact of reduced dimensionality on the magnetic and magnetocaloric response of La0.7Ca0.3MnO3

Tuning magnetic and magnetocaloric properties of Pr0.6Sr0.4MnO3 through size modifications

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