Surface driven effects on magnetic properties of antiferromagnetic LaFeO3 nanocrystalline ferrite

Kumar, A. Sendil; Raja, M. Manivel; Bhatnagar, Anil K.

doi:10.1063/1.4896191

Cited by 16 publications

(5 citation statements)

References 22 publications

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“…This behavior suggests that the onset of ferromagnetism with decreasing particle size is given by the contribution of the surface atoms to the whole magnetization, as previously reported by other authors [21]. The existence of ferromagnetic behavior in orthoferrite nanoparticles has been previously reported by other authors and associated with broken bonds at the surface atoms [4,10,13]. Besides the broken bonds, the lacking oxygen at the surface cells induces The existence of ferromagnetic behavior in orthoferrite nanoparticles has been previously reported by other authors and associated with broken bonds at the surface atoms [4,10,13].…”

Section: Magnetic Propertiessupporting

confidence: 84%

“…The existence of ferromagnetic behavior in orthoferrite nanoparticles has been previously reported by other authors and associated with broken bonds at the surface atoms [4,10,13]. Besides the broken bonds, the lacking oxygen at the surface cells induces The existence of ferromagnetic behavior in orthoferrite nanoparticles has been previously reported by other authors and associated with broken bonds at the surface atoms [4,10,13]. Besides the broken bonds, the lacking oxygen at the surface cells induces changes in the iron oxidation state in order to maintain electrical neutrality [21].…”

Section: Magnetic Propertiessupporting

confidence: 66%

Section: Resultsmentioning

confidence: 64%

“…The iron perovskites (LnFeO 3 , Ln = lanthanide) have attracted much attentions for their multiferroic and magnetic–optical properties and for presenting, in general, a notable exchange bias effect [ 4 ]. All these properties are of great interest for the development of new magnetic memory devices, low-power consumption spintronics devices, and magneto-optical sensors.…”

Section: Introductionmentioning

confidence: 99%

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Transition from AFM Spin Canting to Spin Glass–AFM Exchange as Particle Size Decreases in LaFeO3

Alshalawi¹,

Alonso

Landa-Cánovas

et al. 2023

Nanomaterials

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In this work, we have studied structural and magnetic properties of LaFeO3 as a function of the particle size d, from bulk (d >> 1 µm) to nanoscale (d ≈ 30 nm). A large number of twins were observed for large particles that disappear for small particle sizes. This could be related to the softening of the FeO6 distortion as particle size decreases. It was observed that the bulk sample showed spin canting that disappeared for d ~ 125 nm and can be associated with the smoothening of the orthorhombic distortion. On the other hand, for d < 60 nm, the surface/volume ratio became high and, despite the high crystallinity of the nanoparticle, a notable exchange effect bias appeared, originated by two magnetic interactions: spin glass and antiferromagnetism. This exchange bias interaction was originated by the formation of a “magnetic core–shell”: the broken bonds at the surface atoms give place to a spin glass behavior, whereas the inner atoms maintain the antiferromagnetic G-type order. The LaFeO3 bulk material was synthesized by the ceramic method, whereas the LaFeO3 nanoparticles were synthesized by the sol-gel method; the particle size was varied by annealing the samples at different temperatures. The physical properties of the materials have been investigated by XRD, HRTEM, TGA, and AC and DC magnetometry.

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Section: Magnetic Propertiessupporting

confidence: 84%

Section: Magnetic Propertiessupporting

confidence: 66%

Section: Resultsmentioning

confidence: 64%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Transition from AFM Spin Canting to Spin Glass–AFM Exchange as Particle Size Decreases in LaFeO3

Alshalawi¹,

Alonso

Landa-Cánovas

et al. 2023

Nanomaterials

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“…However, from the literature data it can be conjectured that the LFO nanoparticles having particle size of∼60-100 nm can possibly demonstrate single domain behavior [23]. Evidently, the CFO (∼29 nm)/LFO (∼62 nm) nanocomposite system described in this report can be dealt under the SW model.…”

Section: Tem and Hrtem Images For Microstructural Analysismentioning

confidence: 70%

Enhanced magnetic performance in exchange-coupled CoFe₂O₄–LaFeO₃ nanocomposites

Sharma¹,

Jain²,

Chatterjee³

2021

Nanotechnology

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Nanocomposite oxide system of (x)CoFe2O4 - (100-x)LaFeO3 with different weight percent of core-shell structured CoFe2O4 (x = 0,20,40,50,80,100) and LaFeO3 were fabricated, via a two-step sol-gel wet-chemical synthesis technique. The phase formation of the composites was confirmed by X-ray diffraction and the structural parameters of both the phases were attained from the Rietveld refinement results of XRD patterns. The elemental composition and microstructure of the resulting nanocomposites were examined by using energy-dispersive X-ray spectroscopy (EDX) and high-resolution transmission electron microscopy (HRTEM) technique, respectively. The detailed magnetometry studies at 300 K and 5 K reveal that the inter-and intra-phase magnetic interactions affect the saturation magnetization (MS), remanence magnetization (MR) and coercivity (HC) values of this bi-magnetic system. The remarkable feature of “pinched magnetic hysteresis loop” was evidenced in the [(50) CoFe2O4 - (50)LaFeO3] composite, leading to a lesser magnetic loss factor and better magnetic performance of this sample. The report depicts an improved interfacial exchange coupling at 5 K, for the nanocomposites of core-shell morphology and offers an understanding or explanation of improved magnetic performance for the (50)CoFe2O4 - (50)LaFeO3 nanocomposite and opens up an important way to design new multiferroic applications in low magnetic fields.

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Magnetic Properties and Mössbauer Study of Perovskite LaFeO₃ and LaFe_0.5Cr_0.5O₃

Xia

Chen

et al. 2022

Physica Rapid Research Ltrs

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Herein, a citric acid combustion method is used to prepare LaFeO3 (LFO) and LaFe0.5Cr0.5O3 (LFCO). Stable and distorted perovskite structures are detected by X‐ray diffraction (XRD) patterns of both samples. Due to the substitution of chromium ions, Fe–Fe couplings are wholly disrupted, thus indicating the transition from a sextet to a singlet at room temperature. The M versus T curve of LFO exhibits two anomalous peaks related to Fe–O–Fe superexchange interactions. However, a quite different behavior is observed in LFCO. It reveals the negative irreversibility below 239 K and becomes paramagnetic above 269 K. The field‐cooled (FC) curve of LFCO is also simulated using the Monte Carlo method with Heisenberg model. Exchange coupling and anisotropy constants, which indicate some system properties, are calculated by applying the particle swarm algorithm fitting. The Néel temperature of LFCO is determined to be 80 K.

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Surface driven effects on magnetic properties of antiferromagnetic LaFeO3 nanocrystalline ferrite

Cited by 16 publications

References 22 publications

Transition from AFM Spin Canting to Spin Glass–AFM Exchange as Particle Size Decreases in LaFeO3

Transition from AFM Spin Canting to Spin Glass–AFM Exchange as Particle Size Decreases in LaFeO3

Enhanced magnetic performance in exchange-coupled CoFe₂O₄–LaFeO₃ nanocomposites

Magnetic Properties and Mössbauer Study of Perovskite LaFeO₃ and LaFe_0.5Cr_0.5O₃

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Surface driven effects on magnetic properties of antiferromagnetic LaFeO3 nanocrystalline ferrite

Cited by 16 publications

References 22 publications

Transition from AFM Spin Canting to Spin Glass–AFM Exchange as Particle Size Decreases in LaFeO3

Transition from AFM Spin Canting to Spin Glass–AFM Exchange as Particle Size Decreases in LaFeO3

Enhanced magnetic performance in exchange-coupled CoFe2O4–LaFeO3 nanocomposites

Magnetic Properties and Mössbauer Study of Perovskite LaFeO3 and LaFe0.5Cr0.5O3

Contact Info

Product

Resources

About

Enhanced magnetic performance in exchange-coupled CoFe₂O₄–LaFeO₃ nanocomposites

Magnetic Properties and Mössbauer Study of Perovskite LaFeO₃ and LaFe_0.5Cr_0.5O₃