Synthesis and structural study of LaNi1−xMnxO3+δ perovskites

Blasco, J.; Sánchez, M. C.; Pérez-Cacho, J.; Garcı́a, J.; Subı́as, G.; Campo, Javier

doi:10.1016/s0022-3697(01)00228-1

Cited by 103 publications

(95 citation statements)

References 21 publications

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“…Thus, the magnetic behavior of LNMO can be used to establish the Ni/Mn cation ordering in LNMO. As was found also in bulk materials 12 , the ordered phase possesses alternating Ni ) planes leading to a polar system with large dielectric constant, while such effect is absent in a disordered phase where both Ni and Mn cations are randomly distributed in the crystal structure and both cations have the 3+ oxidation states [6][7][8][9][10][11][12][13][14][15][16] . High temperature ferromagnetic transition in LNMO arises from the superexchange interaction.…”

Section: Introductionsupporting

confidence: 62%

“…They have undoubtedly revealed that the magnetic properties of LNMO are very sensitive to the local Ni/Mn cation ordering [2][3][4][6][7][8][9][10][11][12][13][14][15][16] . As shown with bulk samples, ordered LNMO should display a lone paramagnetic-to-ferromagnetic transition 2 at about 300 K while samples composed of both ordered and disordered phases should have two magnetic phase transitions 3 at ~ 150 K and ~ 300 K arising from distinct magnetic phases.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Ni/Mn cation order on the spin-phonon coupling in multifunctionalLa2NiMnO6epitaxial films by polarized Raman spectroscopy

et al. 2009

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We report the influence of Ni/Mn ordering on the spin-phonon coupling in multifunctional La 2 NiMnO 6 . Three types of films with different levels of structural order, including long-range Ni/Mn cation order, cation disorder, and an admixture of the ordered and disordered phases, are compared by polarized micro-Raman spectroscopy and magnetometry.Each film displays a strong dependence on the polarization configuration and a unique set of Raman active phonon excitations. Long-range cation ordering results in the splitting of Raman active phonon peaks because of Brillouin zone folding and lowering symmetry. Phonon mode softening begins clearly at a distinct temperature for each sample revealing a strong spin-lattice interaction. It follows closely the magnetization curve in ordered films. Unlike the admixture and the ordered films, softening behavior is strongly suppressed in the cation-disordered films. These differences may be understood based on the variation in amplitude of the spin-spin correlation functions due to the local Ni/Mn cation ordering.

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Section: Introductionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Influence of Ni/Mn cation order on the spin-phonon coupling in multifunctionalLa2NiMnO6epitaxial films by polarized Raman spectroscopy

et al. 2009

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“…13 The coexistence of rhombohedral and monoclinic/orthorhombic phase was observed in LNMO at room temperature. 1,4,14 Moreover, rhombohedral LNMO (R 3) and monoclinic LNMO (P2 1 /n) are partially B-siteordered; [15][16][17] rhombohedral LNMO (R 3c) and orthorhombic LNMO (Pbnm) are completely B-site-disordered. 14,18 To fulfill the demands for integrated devices, epitaxial thin films of LNMO have been fabricated on different substrates by pulsed laser deposition (PLD).…”

mentioning

confidence: 99%

“…1,4,14 Moreover, rhombohedral LNMO (R 3) and monoclinic LNMO (P2 1 /n) are partially B-siteordered; [15][16][17] rhombohedral LNMO (R 3c) and orthorhombic LNMO (Pbnm) are completely B-site-disordered. 14,18 To fulfill the demands for integrated devices, epitaxial thin films of LNMO have been fabricated on different substrates by pulsed laser deposition (PLD). 10,12,13,[18][19][20][21][22][23][24] It is known that the microstructure and physical properties of thin films can be influenced by many factors, e.g., the growth conditions including growth temperature and oxygen pressure, and the epitaxial strain induced by the film-substrate lattice mismatch.…”

mentioning

confidence: 99%

“…18 Phase stability of the bulk LNMO can be modulated by different synthesis conditions. 14,15 In our case, the LNMO films were prepared under the same film-growth conditions. The different crystal structure of the LNMO films determined by TEM experiments can be attributed to the different lattice parameters and structures of the two substrates, which have mismatch with those of the film.…”

mentioning

confidence: 99%

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Phase stability and B-site ordering in La2NiMnO6 thin films

Jin

et al. 2016

Applied Physics Letters

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Thin films of multiferroic double-perovskite La2NiMnO6 are prepared on (001)-oriented SrTiO3, (La0.289Sr0.712)(Al0.633Ta0.356)O3, and LaSrAlO4 substrates by pulsed laser deposition. Microstructure investigation by advanced electron microscopy shows that the La2NiMnO6 films have a monoclinic structure on the SrTiO3 substrates and a rhombohedral structure on the (La0.289Sr0.712)(Al0.633Ta0.356)O3 and LaSrAlO4 substrates. Atomic-scale elemental maps of the monoclinic and rhombohedral phases reveal a short-range and/or partial ordering of the B-sites. In addition, domains and columnar grains are found in the films. Our results demonstrate that the phase and microstructure of the La2NiMnO6 films can be tuned by epitaxial strains induced by different substrates.

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Magnetocapacitance and Magnetoresistance Near Room Temperature in a Ferromagnetic Semiconductor: La₂NiMnO₆

et al. 2005

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Materials that show various responses to multiple external stimuli enable novel device applications. The behavior of systems with strong coupling between magnetic and electronic degrees of freedom provides both challenges for solid-state theory as well as novel phenomena for applications such as colossal magnetoresistance in perovskite manganites. Similarly, a strong coupling between magnetism and dielectric properties in magnetic insulators or semiconductors should lead to devices based on the magnetodielectric effect, where the dielectric properties can be controlled by a magnetic field. Large magnetic-field-induced changes in the resistivity and dielectric properties of La 2 NiMnO 6 are found at temperatures as high as 280 K. This is a much higher temperature than previously observed for such a coupling between the magnetic, electric, and dielectric properties in a ferromagnetic semiconductor. The ferromagnetism of La 2 NiMnO 6 was confirmed through neutron-diffraction studies. La 2 NiMnO 6 is a rare example of a single-material platform with multiple functions, in which the spins, electric charge, and dielectric properties can be tuned by magnetic and/or electric fields.Spintronics (short for spin electronics) is a new technology that combines electronics with magnetics through the manipulation of electron spins. It offers the potential for nonvolatile memories, faster data processing speeds with less power usage, larger storage densities, and additional functionalities, such as quantum computation, which are not possible with conventional semiconductor devices.[1,2] Present spintronic devices, e.g., the giant magnetoresistor (GMR), used in readhead sensors, consist of ferromagnetic metallic alloys wherein spin-dependent scattering and tunneling effects have been successfully applied for commercial use. However, in order to fully achieve the potential of practical spintronic devices, the next generation of spintronic materials should be based on ambient-temperature ferromagnetic semiconductors or heterostructures incorporating ferromagnetic metals with nonmagnetic semiconductors, which enable their easy integration into existing electronic devices. The search for semiconducting materials that exhibit strong ferromagnetic behavior at or above room temperature has been extremely difficult due to conflicting requirements in the crystal structure, chemical bonding, and electronic properties of semiconductors and ferromagnetic materials. [1,3] Generally, ferromagnetic semiconductors and insulators only exhibit magnetic ordering at very low temperatures, e.g., EuS (Curie temperature, T c = 16 K), [4] EuO (T c = 77 K), [5] CdCr 2 Se 4 (T c = 130 K), [6] BiMnO 3 (T c = 100 K), [7] SeCuO 3 (T c = 25 K), [8] and diluted magnetic semiconductors, such as (Ga,Mn)As, [1] which precludes their use in devices. However, one exception is an ordered double perovskite, La 2 Ni 2+ Mn 4+ O 6 , an apparent ferromagnetic semiconductor that has a Curie temperature very close to room temperature (T c~2 80 K); [9±12] this is in the ra...

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Synthesis and structural study of LaNi1−xMnxO3+δ perovskites

Cited by 103 publications

References 21 publications

Influence of Ni/Mn cation order on the spin-phonon coupling in multifunctionalLa2NiMnO6epitaxial films by polarized Raman spectroscopy

Influence of Ni/Mn cation order on the spin-phonon coupling in multifunctionalLa2NiMnO6epitaxial films by polarized Raman spectroscopy

Phase stability and B-site ordering in La2NiMnO6 thin films

Magnetocapacitance and Magnetoresistance Near Room Temperature in a Ferromagnetic Semiconductor: La₂NiMnO₆

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Synthesis and structural study of LaNi1−xMnxO3+δ perovskites

Cited by 103 publications

References 21 publications

Influence of Ni/Mn cation order on the spin-phonon coupling in multifunctionalLa2NiMnO6epitaxial films by polarized Raman spectroscopy

Influence of Ni/Mn cation order on the spin-phonon coupling in multifunctionalLa2NiMnO6epitaxial films by polarized Raman spectroscopy

Phase stability and B-site ordering in La2NiMnO6 thin films

Magnetocapacitance and Magnetoresistance Near Room Temperature in a Ferromagnetic Semiconductor: La2NiMnO6

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Magnetocapacitance and Magnetoresistance Near Room Temperature in a Ferromagnetic Semiconductor: La₂NiMnO₆