The effect of high temperature annealing on the antisite defects in ferromagnetic La2NiMnO6 double perovskite

Nasir, Mohammad; Khan, Mahmud; Kumar, Sunil; Bhatt, Subhash; Patra, N.; Bhattacharya, Dibyendu; Jha, S. N.; Biring, Sajal; Sen, Somaditya

doi:10.1016/j.jmmm.2019.03.083

Cited by 28 publications

(19 citation statements)

References 31 publications

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“…La 2 NiMnO 6 is a member of the double‐perovskite family, which has rich electronic and magnetic properties leading to potential industrial applications . It is a ferromagnetic semiconductor with a Curie temperature T C ≈280 K .…”

Section: Introductionmentioning

confidence: 99%

Influence of Cation Order and Valence States on Magnetic Ordering in La₂Ni_1−xMn_1+xO₆

Nasir

Khan

Bhatt

et al. 2019

Physica Status Solidi (b)

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Among multifunctional double perovskite oxides, La2NiMnO6 has recently drawn significant attention due to its importance both in terms of understanding of fundamental physics and potential for device applications. The relative alteration in Ni:Mn ratio strongly influences the structural and magnetic properties of La2NiMnO6. The cation ratio and degree of cation order significantly affect the magnetic coupling of the two B‐site cations in these compounds. In the present study, La2Ni1−xMn1+xO6 (x = −0.25, 0, 0.25) samples with different Ni:Mn ratio have been prepared using sol–gel method and modifications of the above physical properties from that of a stoichiometric sample of La2NiMnO6 are discussed. The crystalline structures of the samples varied with different ionic ratios. While all samples exhibited ferromagnetic behavior, long‐range Ni/Mn magnetic ordering was detected in selected samples only. The experimental values of saturation magnetization were smaller than the theoretical spin‐only moments, which suggests a less ordered state for all samples. Due to an increased antiferromagnetic interaction caused by antisite disorders, the saturation magnetization decreases while the coercive field increases with decreasing Mn content.

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Section: Introductionmentioning

confidence: 99%

Influence of Cation Order and Valence States on Magnetic Ordering in La₂Ni_1−xMn_1+xO₆

Nasir

Khan

Bhatt

et al. 2019

Physica Status Solidi (b)

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“…These results agree with previous studies showing that annealing processes in oxygen rich atmosphere promote an increase of the Curie temperature in La 2 NiMnO 6 films and other double perovskites [ 15 , 16 ]. Furthermore, it has been shown that post-growth annealing treatments are also effective to reduce the number of antisite defects [ 17 ] and to dissolve NiO segregations, thus contributing to increase the saturation magnetization [ 18 ]. However, in our case, in spite of a clear improvement of the ferromagnetic properties after post-growth annealing (ex-situ or in-situ, see also Figure A1 in Appendix A ), nanometric nickel-oxide segregations are still present at the LNMO surface.…”

Section: Resultsmentioning

confidence: 99%

“…To improve the magnetic properties of LNMO samples post-growth annealing processes are commonly employed [ 15 , 16 , 17 ]. Nonetheless, recent studies report the formation of the NiO phase impurities in LNMO thin films grown by MBE technique with the post-growth annealing, with apparently defect-free growth [ 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

Formation of Nickel Oxide Nanocuboids in Ferromagnetic La2Ni1−xMn1+xO6

et al. 2021

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The control of the spontaneous formation of nanostructures at the surface of thin films is of strong interest in many different fields, from catalysts to microelectronics, because surface and interfacial properties may be substantially enhanced. Here, we analyze the formation of nickel oxide nanocuboids on top of La2Ni1−xMn1+xO6 double perovskite ferromagnetic thin films, epitaxially grown on SrTiO3 (001) substrates by radio-frequency (RF) magnetron sputtering. We show that, by annealing the films at high temperature under high oxygen partial pressure, the spontaneous segregation of nanocuboids is enhanced. The evolution of the structural and magnetic properties of the films is studied as a function of the annealing treatments at different temperatures. It is shown that the formation of NiOx nanocuboids leads to a nanostructured film surface with regions of locally different electrical transport characteristics.

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“…However the line-shape of the M(H) curve is still clearly different from M(H) curves observed in the LCMO system and in that of LNMO/STO samples. In the case of LNMO epitaxial films, the values of Ms obtained both in LNMO/STO and LNMO/LAO, around 4.3 µ B /f.u., after a post-RTA thermal treatment are among the best reported in the literature [35,36,40,42], corresponding to an ASD concentration below 10%. M(T) curves suggest a larger magnetic disorder.…”

Section: Samplementioning

confidence: 92%

Rapid Thermal Annealing of Double Perovskite Thin Films Formed by Polymer Assisted Deposition

et al. 2020

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The annealing process is an important step common to epitaxial films prepared by chemical solution deposition methods. It is so because the final microstructure of the films can be severely affected by the precise features of the thermal processing. In this work we analyze the structural and magnetic properties of double perovskite La2CoMnO6 and La2NiMnO6 epitaxial thin films prepared by polymer-assisted deposition (PAD) and crystallized by rapid thermal annealing (RTA). It is found that samples prepared by RTA have similar values of saturation magnetization and Curie temperature to their counterparts prepared by using conventional thermal annealing (CTA) processes, thus indicating low influence of the heating rates on the B-B’ site cationic ordering of the A2BB’O6 double perovskite structure. However, a deeper analysis of the magnetic behavior suggested some differences in the actual microstructure of the films.

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The effect of high temperature annealing on the antisite defects in ferromagnetic La2NiMnO6 double perovskite

Cited by 28 publications

References 31 publications

Influence of Cation Order and Valence States on Magnetic Ordering in La₂Ni_1−xMn_1+xO₆

Influence of Cation Order and Valence States on Magnetic Ordering in La₂Ni_1−xMn_1+xO₆

Formation of Nickel Oxide Nanocuboids in Ferromagnetic La2Ni1−xMn1+xO6

Rapid Thermal Annealing of Double Perovskite Thin Films Formed by Polymer Assisted Deposition

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The effect of high temperature annealing on the antisite defects in ferromagnetic La2NiMnO6 double perovskite

Cited by 28 publications

References 31 publications

Influence of Cation Order and Valence States on Magnetic Ordering in La2Ni1−xMn1+xO6

Influence of Cation Order and Valence States on Magnetic Ordering in La2Ni1−xMn1+xO6

Formation of Nickel Oxide Nanocuboids in Ferromagnetic La2Ni1−xMn1+xO6

Rapid Thermal Annealing of Double Perovskite Thin Films Formed by Polymer Assisted Deposition

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Influence of Cation Order and Valence States on Magnetic Ordering in La₂Ni_1−xMn_1+xO₆

Influence of Cation Order and Valence States on Magnetic Ordering in La₂Ni_1−xMn_1+xO₆