Magnetic, electrical transport and electron spin resonance studies of Fe-doped manganite LaMn0.7Fe0.3O3+δ

Liu, X.J.; Li, Z.Q.; Yu, Aibing; Liu, M.L.; Li, W.R.; Li, B.L.; Wu, Peng; Bai, Haili; Jiang, E.Y.

doi:10.1016/j.jmmm.2007.02.003

Cited by 26 publications

(21 citation statements)

References 27 publications

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“…The earlier studies 15,23,27,28 reached a consensus on the suppression of ferromagnetism through the substitution of Mn 3+ by Fe 3+ , which reduces the amount of double exchange coupled Mn 4+ –O–Mn 3+ bonds. The results of ac susceptibility and exchange bias support the viewpoint that there is some degree of phase separation between short range FM clusters and SG components in this system 21,22,28,29 . Furthermore, no enhanced ferromagnetism was observed for the sample of x =0.5 as compared with the artificial superlattices of LaFeO 3 –LaMnO 3 , 20 probably due to the lack of sufficiently long‐range Fe 3+ –O–Mn 3+ interactions in polycrystalline samples where Fe and Mn cations are randomly distributed 30…”

Section: Resultssupporting

confidence: 64%

“…The artificial superlattices of LaFeO 3 –LaMnO 3 also show strong FM (or ferrimagnetic) behaviors because the Fe 3+ –O–Mn 3+ SE interaction is considered to be FM according to the theory of Goodenough–Kanamori, and the spin frustration effect of the superlattices leads to a spin‐glass state 11,20 . The evidence of the phase separation between FM and spin‐glass regions has been given in the LaMn 1− x Fe x O 3 (LMFO– x ) system 21–23 . Despite the possibility of magnetoelectric coupling in LMFO, 24 no MD effect has been reported.…”

Section: Introductionmentioning

confidence: 99%

“…11,20 The evidence of the phase separation between FM and spin-glass regions has been given in the LaMn 1Àx Fe x O 3 (LMFO-x) system. [21][22][23] Despite the possibility of magnetoelectric coupling in LMFO, 24 no MD effect has been reported.…”

Section: Introductionmentioning

confidence: 99%

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Magnetodielectric Effect and Tunable Dielectric Properties of LaMn_1−xFe_xO₃

Dong

Hou

Yao

et al. 2010

Journal of the American Ceramic Society

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The dielectric properties of LaMn1−xFexO3 (LMFO, 0.1≤x≤0.5) under magnetic fields and electrical biases have been studied. A considerable low‐field magnetodielectric (MD) effect is observed for x≤0.2, but it is suppressed by further Fe substitution. Besides the giant MD effect, the dielectric constants can also be tuned by dc electrical bias, and a reduction of more than 70% for x≤0.2 under a low bias of 40 V/cm is achieved. These results together with the impedance characteristics can be explained by the contributions of barrier layers at interfacial and grain boundaries as well as the magnetoelectric coupling. The giant dielectric response and tunability under both low magnetic and electric fields in the nonferroelectrics may be advantageous for applications.

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Section: Resultssupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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Magnetodielectric Effect and Tunable Dielectric Properties of LaMn_1−xFe_xO₃

Dong

Hou

Yao

et al. 2010

Journal of the American Ceramic Society

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“…All the samples exhibit a ferromagneticparamagnetic transition at T C , determined the minimum of its numerical first derivative, ( )/ dM T dT . The pure saturation and the sharp drop of magnetization in the parent LBMO support the high homogeneity of the samples in the XRD patterns, while the drop of LBMO/NiO is due to the existence of non-homogeneity NiO phase [26]. In the parent LBMO the annealing process increases magnetization and decreases T C in agreement with La 1-x Ce x MnO 3 [27].…”

Section: Magnetizationsupporting

confidence: 59%

The annealing influence onto the electrical and magnetic behavior of magnetoresistive/insulator system

Ahmed

Mohamed

et al. 2016

Low Temperature Physics

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This investigation is mainly concerned with the effect of annealing temperature (600, 700, 800 and 900 °C) in air for (La 0.7 Ba 0.3 MnO 3 ) 1-x /(NiO) x with x = 0 and x = 0.10 samples. It was shown that the annealing temperature does not affect the structure and parameters of rhombohedral lattice of the samples. However, it is observed that the annealing treatment has a notable effect on the electrical resistivity and the metal-semiconductor transition temperature T ms . Temperature dependent magnetization measurements showed a decrease in Curie temperature T C with annealing temperature. In the same time, annealing process decreases the magnetoresistance of La 0.7 Ba 0.3 MnO 3 , in contrast to (La 0.7 The magnetoresistive material was mixed with an insulator material to enhance the extrinsic CMR that depending on grain boundaries [6] and spin tunneling [7], that CMR may increase under low magnetic fields known as low field magnetoresistance (LFMR). The importance of LFMR refers to use low magnetic field to get high values of MR what is making it useful for applications. This LFMR can be affected by other several factors; one of them is annealing temperature that can affect the grain size and hence the physical properties including LFMR. An annealing effect has a little attention in this direction, especially in LBMO/insulator. Therefore in this work the effects of annealing temperature on the electrical, magnetic, magnetoresistance and thermoelectric properties of La 0.7 Ba 0.3 MnO 3 (LBMO) and (La 0.7 Ba 0.3 MnO 3 ) 0.9 /(NiO) 0.1 (LBMO/NiO) are examined. Experimental(La 0.7 Ba 0.3 MnO 3 ) 1-x /(NiO) x ceramic samples were prepared by the conventional solid state reaction method (x = = 0.0 & 0.10). La 2 O 3 , BaCO 3 and MnCO 3 raw materials were mixed in stoichiometric proportions, ground, pelletized and calcined at 900 °C for 24 h. It was reground again and pelletized and then sintered at 1100 °C for 24 h. NiO insulator was added in stoichiometric portions to the sintered La 0.7 Ba 0.3 MnO 3 compound and lightly ground, then pressed and put in 1000 °C for 24 h. The composites of LBMO and LBMO/NiO annealed for 2 h at 600, 700, 800 and 900 °C. Electrical resistivity was measured by van der Pauw technique in the presence and absence of 0.6 T magnetic field. Samples were examined by x ray, using Brucker (Axs-D& Advance) powder diffractometer at room temperature with Cu (K α ) radiation (λ = 1.5406 Å). The microstructure was investigated by Jeol JSM-6610LV

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“…[8] Recently, we observed the signature of EB phenomenon in the cluster-glass (CG) compounds LaMn 0.7 Fe 0.3 O 3 and La 0.87 Mn 0.7 Fe 0.3 O 3 , [9,10] where short range FM clusters are embedded in a SG-like matrix creating spontaneous FM/SG interface. [9,11,12,13] The average size of the FM clusters is found to decrease systematically with decreasing particle size, which has a strong influence on the EB phenomenon. The EB field increases significantly with decreasing particle size, which was attributed to the increase of interface area by decreasing particle size.…”

Section: Introductionmentioning

confidence: 93%

The exchange bias effect in phase separated Nd_1−xSr_xCoO₃at the spontaneous ferromagnetic/ferrimagnetic interface

Patra

Thakur

Majumdar

et al. 2009

J. Phys.: Condens. Matter

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We report the new results of exchange bias effect in Nd1−xSrxCoO3 for x = 0.20 and 0.40, where the exchange bias phenomenon is involved with the ferrimagnetic (FI) state in a spontaneously phase separated system. The zero-field cooled magnetization exhibits the FI (TF I ) and ferromagnetic (TC ) transitions at ∼ 23 and ∼ 70 K, respectively for x = 0.20. The negative horizontal and positive vertical shifts of the magnetic hysteresis loops are observed when the system is cooled through TF I in presence of a positive static magnetic field. Training effect is observed for x = 0.20, which could be interpreted by a spin configurational relaxation model. The unidirectional shifts of the hysteresis loops as a function of temperature exhibit the absence of exchange bias above TF I for x = 0.20. The analysis of the cooling field dependence of exchange bias field and magnetization indicates that the ferromagnetic (FM) clusters consist of single magnetic domain with average size around ∼ 20 and ∼ 40Å for x = 0.20 and 0.40, respectively. The sizes of the FM clusters are close to the percolation threshold for x = 0.20, which grow and coalesce to form the bigger size for x = 0.40 resulting in a weak exchange bias effect.

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Magnetic, electrical transport and electron spin resonance studies of Fe-doped manganite LaMn0.7Fe0.3O3+δ

Cited by 26 publications

References 27 publications

Magnetodielectric Effect and Tunable Dielectric Properties of LaMn_1−xFe_xO₃

Magnetodielectric Effect and Tunable Dielectric Properties of LaMn_1−xFe_xO₃

The annealing influence onto the electrical and magnetic behavior of magnetoresistive/insulator system

The exchange bias effect in phase separated Nd_1−xSr_xCoO₃at the spontaneous ferromagnetic/ferrimagnetic interface

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Magnetic, electrical transport and electron spin resonance studies of Fe-doped manganite LaMn0.7Fe0.3O3+δ

Cited by 26 publications

References 27 publications

Magnetodielectric Effect and Tunable Dielectric Properties of LaMn1−xFexO3

Magnetodielectric Effect and Tunable Dielectric Properties of LaMn1−xFexO3

The annealing influence onto the electrical and magnetic behavior of magnetoresistive/insulator system

The exchange bias effect in phase separated Nd1−xSrxCoO3at the spontaneous ferromagnetic/ferrimagnetic interface

Contact Info

Product

Resources

About

Magnetodielectric Effect and Tunable Dielectric Properties of LaMn_1−xFe_xO₃

Magnetodielectric Effect and Tunable Dielectric Properties of LaMn_1−xFe_xO₃

The exchange bias effect in phase separated Nd_1−xSr_xCoO₃at the spontaneous ferromagnetic/ferrimagnetic interface