Magnetism in cupric oxide

Forsyth, J. B.; Brown, P. J.; Wanklyn, B.M.

doi:10.1088/0022-3719/21/15/023

Cited by 299 publications

(213 citation statements)

References 11 publications

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“…Bulk CuO exhibit a second-order transition from paramagnetism to incommensurate antiferromagnetism at a Neel temperature of about 230 k and also exhibit a first-order transition from incommensurate to commensurate antiferromagnetism at a temperature of about 213 k [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Annealing effect on the optical and solid state properties of cupric oxide thin films deposited using the Aqueous Chemical Growth (ACG) method

Mammah¹,

Opara²,

Omubo-Pepple³

et al. 2013

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Thin films of CuO having an average thickness of 720 nm were deposited on clean glass substrates using the Aqueous Chemical Growth (ACG) method with Cu(NO 3 ) 2 and C 6 H 12 N 4 as precursors and annealed at different temperatures in order to determine the effect of annealing temperature on their optical and solid state properties. The study was carried out using Rutherford Backscattering (RBS) spectroscopy for t thickness and chemical composition, X-Ray Diffraction (XRD) for crystallographic structure and a UV-VIS spectrophotometer for spectral analysis. The results indicate that the absorbance and absorption/extinction coefficient of the films vary inversely with annealing temperature while the transmittance, reflectance, direct band gap, real/imaginary dielectric constants and refractive index vary directly with annealing temperature. The results further indicate an improvement in crystallinity as annealing temperature increases. The as-deposited and annealed ACG CuO thin films were found to be suitable for use as window layer in solar cells among other electronic and optoelectronic applications.

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Section: Introductionmentioning

confidence: 99%

Annealing effect on the optical and solid state properties of cupric oxide thin films deposited using the Aqueous Chemical Growth (ACG) method

Mammah¹,

Opara²,

Omubo-Pepple³

et al. 2013

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“…Neutron diffraction studies have clarified the magnetic phases of CuO 21,22 . At low temperatures there is a commensurate, collinear antiferromagnetic phase (AF1) with two Cu 2 þ sublattices, on which spins are oriented parallel or antiparallel to [010], as pictured in Fig.…”

mentioning

confidence: 99%

“…1 24 . Between 213 and 230 K (AF2 phase) the spins on one sub-lattice rotate into the acplane 21,22,25 , as pictured in Fig. 1b, and an incommensurate spin spiral structure is formed with magnetic modulation vector Q ¼ (0.006, 0, 0.017).…”

mentioning

confidence: 99%

High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange

et al. 2014

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Magnetically induced ferroelectric multiferroics present an exciting new paradigm in the design of multifunctional materials, by intimately coupling magnetic and polar order. Magnetoelectricity creates a novel quasiparticle excitation-the electromagnon-at terahertz frequencies, with spectral signatures that unveil important spin interactions. To date, electromagnons have been discovered at low temperature (o70 K) and predominantly in rare-earth compounds such as RMnO 3 . Here we demonstrate using terahertz time-domain spectroscopy that intersublattice exchange in the improper multiferroic cupric oxide (CuO) creates electromagnons at substantially elevated temperatures (213-230 K). Dynamic magnetoelectric coupling can therefore be achieved in materials, such as CuO, that exhibit minimal static cross-coupling. The electromagnon strength and energy track the static polarization, highlighting the importance of the underlying cycloidal spin structure. Polarized neutron scattering and terahertz spectroscopy identify a magnon in the antiferromagnetic ground state, with a temperature dependence that suggests a significant role for biquadratic exchange.

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“…Ceci suggère que les couplages entre les moments dans les deux phases sont presque les mêmes. Des mesures d'intensités intégrées ne permettaient pas de distinguer clairement entre les différents modèles possibles de la modulation [3]. Les mesures en PSN de quelques réflexions h0l ± τ ont permis de résoudre le problème [4].…”

Section: La Structure Incommensurable De L'oxide De Cuivreunclassified

Utilisations de l'analyse de polarisation pour la détermination de structures magnétiques

Brown

2007

Journées de la Neutronique

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Résumé. Ce cours traite de l'application de la polarimétrie, et en particulier de la polarimétrie sphérique de neutrons (PSN) pour la détermination de structures magnétiques. La première partie nous permettra d'introduire quelques unes des équations fondamentales et de montrer comment ces équations sont reliées aux quantités mesurées lors de l'utilisation de l'analyse de polarisation. Ensuite, les problèmes qui pourraient être rencontrés lors de l'étude de cristaux réels seront introduits. Les dernières sections présentent des exemples de problèmes auxquels la PSN a été appliquée avec succès.

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Magnetism in cupric oxide

Cited by 299 publications

References 11 publications

Annealing effect on the optical and solid state properties of cupric oxide thin films deposited using the Aqueous Chemical Growth (ACG) method

Annealing effect on the optical and solid state properties of cupric oxide thin films deposited using the Aqueous Chemical Growth (ACG) method

High-temperature electromagnons in the magnetically induced multiferroic cupric oxide driven by intersublattice exchange

Utilisations de l'analyse de polarisation pour la détermination de structures magnétiques

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