Study of combined effect of partial Bi doping and particle size reduction on magnetism of La0.7Sr0.3MnO3

Souza, Anita D.; Babu, P. D.; Rayaprol, Sudhindra; Murari, M.S.; Daivajna, Mamatha D.

doi:10.1016/j.jmmm.2019.166020

Cited by 14 publications

(9 citation statements)

References 51 publications

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“…A substantial reduction in the D has been noticed in the initial stage of ball milling up to 90 min and thereafter the D appears to level off, while the e manifests a monotonous increase up to 120 min of ball milling and then reaches a steady value. A similar variation in D and e with t m has been observed in case of La 0.8 Sr 0.2 MnO 3-d [44], La 0.7 Sr 0.3 MnO 3 [38], and Bi-doped La 0.7 Sr 0.3-MnO 3 [39,40]. The significant changes in the D and e during the commencing state of ball milling could be attributed to the enhanced rate of dislocation densities and defects induced due to the constant collision between the sample mass and balls with the walls of the vials [44][45][46].…”

Section: Results and Discussion 31 Structural Studiessupporting

confidence: 80%

“…The value of a/H increases with a decrease in D, specify the growth in the structural defects with size reduction, while K exhibits a decrease probably due to the disorder in the core of the nanoparticles [57]. Similar variation in a/H and K has been previously noticed in the case of LSMO manganites [38][39][40]. Additionally, a large drop in the magnitude of M S from 3.6 to 0.5 l B / f.u.…”

Section: Magnetization Studiessupporting

confidence: 74%

“…Pr 0.6 Sr 0.4 MnO 3 (PSMO) nanoparticles were prepared in a two-step process by using the top-down approach [38][39][40]. The polycrystalline bulk sample prepared by solid-state reaction method [41] was subjected to high-energy ball milling to get the nanosized sample.…”

Section: Methodsmentioning

confidence: 99%

“…The detailed methodology has been described in our earlier papers [38][39][40][41]. In the present study, 10 mm tungsten carbide balls were used and the ball mass to sample mass ratio was maintained at 20:1.…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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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