scholarly journals Effects of film thickness and mismatch strains on magnetoelectric coupling in vertical heteroepitaxial nanocomposite thin films

2011 ◽  
Vol 109 (9) ◽  
pp. 094102 ◽  
Author(s):  
H. T. Chen ◽  
L. Hong ◽  
A. K. Soh
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Magnetoelectric Coupling ◽  
Nanocomposite Thin Films

Non-epitaxial, Highly Textured (001) CoPt:B2O3 Composite Films for Perpendicular Recording

2002 ◽  
Vol 721 ◽  
Author(s):  
M. L. Yan ◽  
N. Powers ◽  
D. J. Sellmyer
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Epitaxial Growth ◽  
Thermal Processing ◽  
Composite Films ◽  
Annealing Process ◽  
Perpendicular Anisotropy ◽  
Perpendicular Recording ◽  
Nanocomposite Thin Films ◽  
Deposited Films

AbstractWe report the non-epitaxial growth of highly textured (001) CoPt:B2O3 nanocomposite thin films that are deposited directly on thermally-oxidized Si wafers. Multilayers of Co/Pt/Co/B2O3 are deposited followed by appropriate thermal processing. The as-deposited films are disordered fcc CoPt phase, and magnetically soft. After annealing, an (001) orientation of CoPt-ordered grains is developed. The texture development is dependent both on the total film thickness and the annealing process. Nearly perfect (001) texture can be obtained in films with thinner initial layer thicknesses. Strong perpendicular anisotropy is shown to be related to this (001) texture.

Isothermal Physical Aging of Poly(ethyl methacrylate)/Polyhedral Oligomeric Silsequioxanes Nanocomposite Thin Films

2011 ◽  
Vol 287-290 ◽  
pp. 2234-2239 ◽  
Author(s):  
Sil Ro Jin ◽  
Jong Keun Lee
Keyword(s):  
Thin Films ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Film Thickness ◽  
Methyl Methacrylate ◽  
Relaxation Function ◽  
Physical Aging ◽  
Pmma Film ◽  
Nanocomposite Thin Films

The effects of the polyhedral oligomeric silsequioxanes (POSS) in stacked poly(methyl methacrylate) (PMMA) film samples were investigated in two different film thicknesses, ~50 and ~660 nm. The types of the POSS include methacryl-, octaisobutyl-, and octasilane-POSS. The glass transition temperature (Tg) and isothermal physical aging was depressed by the reduction of film thickness. Among POSS molecules used in this work, methacryl-POSS was the greatest effect in both Tgand relaxation enthalpy (DHRelax) due to the physical aging. The Kohlrausch-Williams-Watts (KWW) relaxation function was used to further understand the effect of POSS and film thickness on the physical aging.

scholarly journals Strain-mediated magnetoelectric coupling in BaTiO3-Co nanocomposite thin films

2008 ◽  
Vol 92 (6) ◽  
pp. 062908 ◽  
Author(s):  
Jung H. Park ◽  
Hyun M. Jang ◽  
Hyung S. Kim ◽  
Chan G. Park ◽  
Sang G. Lee
Keyword(s):  
Thin Films ◽  
Magnetoelectric Coupling ◽  
Nanocomposite Thin Films

Relaxor Ferroelectricity and Magnetoelectric Coupling in ZnO–Co Nanocomposite Thin Films: Beyond Multiferroic Composites

2014 ◽  
Vol 6 (7) ◽  
pp. 4737-4742 ◽  
Author(s):  
D. Y. Li ◽  
Y. J. Zeng ◽  
D. Batuk ◽  
L. M. C. Pereira ◽  
Z. Z. Ye ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetoelectric Coupling ◽  
Nanocomposite Thin Films

The Effect of Nanoparticles on the Thermal Conductivity of Crystalline Thin Films at Low Temperatures

2007 ◽  
Author(s):  
Kamal M. Katika ◽  
Laurent Pilon
Keyword(s):  
Thin Films ◽  
Thermal Conductivity ◽  
Radiative Transfer ◽  
Film Thickness ◽  
Volume Fraction ◽  
Phonon Transport ◽  
Solid Matrix ◽  
Discrete Ordinates ◽  
Nanoparticle Radius ◽  
Nanocomposite Thin Films

This study is concerned with the prediction of the effective thermal conductivity of nanocomposite thin films consisting of nanoparticles randomly distributed in a solid matrix. Crystalline sodium chloride with embedded monodisperse silver nanoparticles is investigated as a case study for thin films where phonons are the main heat carriers. To the best of our knowledge, the equation for phonon radiative transfer is solved for the first time with an exact scattering transport cross-section of the nanoparticles as a function of frequency which was obtained from the literature. The one-dimensional equation for phonon radiative transfer based on the isotropic scaling approximation is solved on a spectral basis using the discrete ordinates method to predict the temperature profile and the heat flux across the nanocomposite thin films. The thermal conductivity is retrieved at temperatures where the effects of Umklapp and Normal processes can be neglected and scattering by the particles on phonon transport dominates. The method of solution and closure laws were validated with experimental data of thermal conductivity for bulk samples at 2.53, 5.94, and 10.56 K. The effects of the film thickness (1 μm to 2.5 cm), nanoparticle diameter (5 nm to 100 nm) and volume fraction (0.0001 to 0.2) on the thermal conductivity of the nanocomposite thin film are investigated. The results indicate that the thermal conductivity decreases with decreasing particle radius as well as with increasing particle concentration. Finally, a dimensionless analysis revealed a power law relationship between the dimensionless thermal conductivity and a dimensionless length of the order of the acoustic thickness of the medium. These results can be used to design nanocomposite thin films for various low temperature thermal applications by choosing optimal nanoparticle radius and volume fraction, and film thickness.

Converse magnetoelectric coupling in NiFe/Pb(Mg1/3Nb2/3)O3–PbTiO3 nanocomposite thin films grown on Si substrates

2013 ◽  
Vol 103 (19) ◽  
pp. 192903 ◽  
Author(s):  
Ming Feng ◽  
Jiamian Hu ◽  
Jianjun Wang ◽  
Zheng Li ◽  
Li Shu ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetoelectric Coupling ◽  
Si Substrates ◽  
Nanocomposite Thin Films

Giant Anisotropy of Conductivity in Hydrogenated Nanocrystalline Silicon Thin Films

1998 ◽  
Vol 536 ◽  
Author(s):  
A. B. Pevtsov ◽  
N. A. Feoktistov ◽  
V. G. Golubev
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Percolation Theory ◽  
Nanocrystalline Silicon ◽  
Spatial Light Modulators ◽  
Light Emitting ◽  
Light Modulators ◽  
Silicon Thin Films ◽  
Longitudinal Conductivity ◽  
Transverse Conductivity

AbstractThin (<1000 Å) hydrogenated nanocrystalline silicon films are widely used in solar cells, light emitting diodes, and spatial light modulators. In this work the conductivity of doped and undoped amorphous-nanocrystalline silicon thin films is studied as a function of film thickness: a giant anisotropy of conductivity is established. The longitudinal conductivity decreases dramatically (by a factor of 109 − 1010) as the layer thickness is reduced from 1500 Å to 200 Å, while the transverse conductivity remains close to that of a doped a- Si:H. The data obtained are interpreted in terms of the percolation theory.

Sign in / Sign up

Export Citation Format

Share Document