Temperature dependent phonon Raman scattering of highly <i>a</i>-axis oriented CoFe2O4 inverse spinel ferromagnetic films grown by pulsed laser deposition

Liao, Ying-Yen; Li, Y. W.; Hu, Zhigao; Chu, Junhao

doi:10.1063/1.3683520

Cited by 43 publications

(20 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The numbers of Raman lines and their positions are consistent with those of previous studies of CFO samples in the forms of crystals, powders, and thin films. [18][19][20][21] The apparent differences between XY and X ′ Y ′ spectra and between XX and X ′ X ′ spectra provide unambiguous evidence that the film is of excellent epitaxial quality. The number of the Raman lines exceeds that expected for a normal spinel or an inverse spinel with Co/Fe disorder at the B-sites, where only five Raman modes (A 1g + E g + 3F 2g ) are allowed.…”

Section: Resultsmentioning

confidence: 82%

Epitaxial growth of spinel cobalt ferrite films on MgAl2O4 substrates by direct liquid injection chemical vapor deposition

Shen

Althammer

Pachauri

et al. 2014

Journal of Crystal Growth

View full text Add to dashboard Cite

The direct liquid injection chemical vapor deposition (DLI-CVD) technique has been used for the growth of cobalt ferrite (CFO) films on (100)-oriented MgAl 2 O 4 (MAO) substrates. Smooth and highly epitaxial cobalt ferrite thin films, with the epitaxial relationship MAO(100) [001] CFO (100) [001], are obtained under optimized deposition conditions. The films exhibit bulk-like structural and magnetic properties with an out-of-plane lattice constant of 8.370Å and a saturation magnetization of 420 kA/m at room temperature. The Raman spectra of films on MgAl 2 O 4 support the fact that the Fe 3+ -and the Co 2+ -ions are distributed in an ordered fashion on the B-site of the inverse spinel structure. The DLI-CVD technique has been extended for the growth of smooth and highly oriented cobalt ferrite thin films on a variety of other substrates, including MgO, and piezoelectric lead magnesium niobate-lead titanate and lead zinc niobate-lead titanate substrates.

show abstract

Section: Resultsmentioning

confidence: 82%

Epitaxial growth of spinel cobalt ferrite films on MgAl2O4 substrates by direct liquid injection chemical vapor deposition

Shen

Althammer

Pachauri

et al. 2014

Journal of Crystal Growth

View full text Add to dashboard Cite

show abstract

“…In the flat state, spinel structure CFO exhibits 4 active modes: 679 cm −1 (A 1g (1)), 610 cm −1 (A 1g (2)), 514 cm −1 (T 2g (1)), and 476 cm −1 (T 2g (2)). 19 When the sample was bent out, all those modes uniformly shifted toward lower wavenumbers, the smaller radius led to the larger shift. Such a phenomenon indicates the expansion of CFO lattice via bending-out.…”

Section: ■ Results and Discussionmentioning

confidence: 96%

Dynamical Strain-Driven Phase Separation in Flexible CoFe₂O₄/CoO Exchange Coupling System

Chen

Yen

et al. 2020

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Epitaxial CoFe 2 O 4 (CFO)/CoO bilayers were fabricated by pulsed laser deposition on flexible muscovite mica substrate. Samples with different CFO thicknesses were employed to study the phenomenon of exchange bias involving strongly anisotropic ferromagnet. Magnetic measurements exhibited great enhancement in the features of exchange bias. Raman and X-ray absorption spectroscopies indicated that a new phase emerged within the CFO layer because of the cation charge redistribution in CFO layer under bending, which in turn gave rise to anomalous hysteresis loops exhibited in the bent bilayers. These results provide a fundamental understanding about the mechanisms of exchange bias prevailing in these bilayers and call attention to the implementation of spintronic devices using flexible heterostructures such as the present CFO/CoO bilayers.

show abstract

“…Bi 2 Se 3 has an extensive application as thermoelectric and photoelectric materials near the room temperature [24,25]. Raman spectroscopy was an important tool to characterize the physical properties of various nanostructures, such as: 1T-TaS 2 [26], TiS 3 [27], MoS 2 [28], CoFe 2 O 4 [29], CuGaO 2 [30], Bi 3.25 La 0.75 Ti 3 O 12 [31], ZnSe [18,32], ZnO [33], etc. Recently, there are some reports about the Raman-active optical phonon of Bi 2 Se 3 micro/nanostructures [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Temperature-Dependent Raman Scattering of Large Size Hexagonal Bi2Se3 Single-Crystal Nanoplates

et al. 2018

View full text Add to dashboard Cite

Bi 2 Se 3 has extensive application as thermoelectric materials. Here, large-scale Bi 2 Se 3 single-crystal hexagonal nanoplates with size 7.50–10.0 μ m were synthesized successfully by hydrothermal method. X-ray diffraction (XRD), scanning electron microscope (SEM), and transmission electron microscope (TEM) were used to characterize the Bi 2 Se 3 nanoplates, which confirm the single-crystal quality and smooth surface morphology with large size. Micro-Raman spectra over a temperature range of 83–603 K were furthermore used to investigate the lattice dynamics of Bi 2 Se 3 nanoplates. Both 2A g 1 and 1E g 2 modes shift evidently with reduced temperature. The line shape demonstrates a significant broadening of full width at half maximum (FWHM) and red-shift of frequency with increased temperature. The temperature coefficient of A 1 g 1 , E g 2 , A 1 g 2 modes were determined to be −1.258 × 10 − 2 cm − 1 /K, −1.385 × 10 − 2 cm − 1 /K, −2.363 × 10 − 2 cm − 1 /K, respectively. Such low temperature coefficient may favor the obtaining of a high figure of merit (ZT) and indicate that Bi 2 Se 3 nanoplates were used as excellent candidates of thermoelectric materials.

show abstract

Temperature dependent phonon Raman scattering of highly a-axis oriented CoFe2O4 inverse spinel ferromagnetic films grown by pulsed laser deposition

Cited by 43 publications

References 25 publications

Epitaxial growth of spinel cobalt ferrite films on MgAl2O4 substrates by direct liquid injection chemical vapor deposition

Epitaxial growth of spinel cobalt ferrite films on MgAl2O4 substrates by direct liquid injection chemical vapor deposition

Dynamical Strain-Driven Phase Separation in Flexible CoFe₂O₄/CoO Exchange Coupling System

Temperature-Dependent Raman Scattering of Large Size Hexagonal Bi2Se3 Single-Crystal Nanoplates

Contact Info

Product

Resources

About

Temperature dependent phonon Raman scattering of highly a-axis oriented CoFe2O4 inverse spinel ferromagnetic films grown by pulsed laser deposition

Cited by 43 publications

References 25 publications

Epitaxial growth of spinel cobalt ferrite films on MgAl2O4 substrates by direct liquid injection chemical vapor deposition

Epitaxial growth of spinel cobalt ferrite films on MgAl2O4 substrates by direct liquid injection chemical vapor deposition

Dynamical Strain-Driven Phase Separation in Flexible CoFe2O4/CoO Exchange Coupling System

Temperature-Dependent Raman Scattering of Large Size Hexagonal Bi2Se3 Single-Crystal Nanoplates

Contact Info

Product

Resources

About

Dynamical Strain-Driven Phase Separation in Flexible CoFe₂O₄/CoO Exchange Coupling System