Magnetic and structural investigations on La0.6Sr0.4MnO3 nanostructured manganite: Evidence of a ferrimagnetic shell

Andrade, Vivian M.; Caraballo-Vivas, R.J.; Costa-Soares, T.; Pedro, S.S.; Rocco, D.L.; Reis, M. S.; Campos, Andréa; Coelho, Leandro dos Santos

doi:10.1016/j.jssc.2014.07.013

Cited by 25 publications

(23 citation statements)

References 28 publications

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“…The inset in Figure a clearly shows how with increasing T, M S decreases at a given external field in La 0.67 S 0.33 MnO 3 . The numerical calculations are in a good quantitative coincidence with the experimental results . The black squares in Figure a denote experimental data.…”

Section: Numerical Results and Discussionsupporting

confidence: 71%

“…Experimental data show that magnetic hysteresis is observed in LSMO NPs, unlike bulk samples where magnetic losses are not observed. According to Ref.…”

Section: Numerical Results and Discussionmentioning

confidence: 88%

“…Dependence of M S on the dopant concentration x for bulk samples: a) for H = 5 kOe and different T ‐values: 1) 5 K; 2) 100 K; 3) 200 K, and 4) 225 K; the inset shows M S ( H ) at different temperatures for x = 0.33, b) for H = 100 Oe, and T : 1) 100 K; 2) 200 K, and 3) 300 K. The black squares in Figure a denote experimental data from Refs. .…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…With the vanishing double exchange interaction the spin correlation of the surface is governed by the antiferromagnetic super‐exchange interactions. They make the surface layer practically non‐magnetic. From a theoretical point of view, free electrons interact with localized spins by strong intra‐atomic Hund coupling I , as I is much larger than the hopping integral t ( I ≫ | t |) . The hopping integral is treated as a weak perturbation.…”

Section: Model and Methodsmentioning

confidence: 99%

“…With decreasing value of

J_{i j}^{s} true({Mn}^{3 +} - {Mn}^{4 +} true)

on the surface we detect change in the competition between the double‐exchange and super‐exchange interactions in the shell. For LSMO the magnetization, as a function of magnetic field, presents a hysteresis behavior for the NP while the bulk samples are free of magnetic losses . Xi et al concluded that it is due to the large surface anisotropy.…”

Section: Model and Methodsmentioning

confidence: 99%

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La_1−xSr_xMnO₃ Nanoparticles for Magnetic Hyperthermia

Apostolov

Apostolova

Wesselinowa

2018

Physica Status Solidi (b)

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Using a modified Heisenberg model and a Green's function technique we have studied the influence of size d and concentration x of Sr dopants on the Curie temperature T C , saturation magnetization M S , coercivity H C and specific absorption rate (SAR) of single-domain La 1Àx Sr x MnO 3 nanoparticles. Their magnetic properties are explained based on the "magnetically death" surface layer and the competition between the ferromagnetic double-exchange and antiferromagnetic super-exchange interaction. We calculated the specific absorption rate which characterizes the efficiency of the absorption energy when the magnetic hyperthermia is applied as a therapeutic method for the treatment of tumors. A set of nanoparticles appropriate for in vivo and in vitro medical applications, such as magnetic hyperthermia and drug delivery to cancer cells, is determined. The established methodology and microscopic model are suitable to study the magnetic properties of low-dimensional systems (thin films and nanoparticles) such as La 1Àx A x MnO 3 with A ¼ Ca, Ag, Ba, Na for medical applications.

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Section: Numerical Results and Discussionsupporting

confidence: 71%

“…Experimental data show that magnetic hysteresis is observed in LSMO NPs, unlike bulk samples where magnetic losses are not observed. According to Ref.…”

Section: Numerical Results and Discussionmentioning

confidence: 88%

Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Model and Methodsmentioning

confidence: 99%

“…With decreasing value of