Magnetic signature of compositional gradient in exchange-spring bilayer films of CoPt/Co

2001 ◽  
Vol 89 (11) ◽  
pp. 7528-7530 ◽  
Author(s):  
D. C. Crew ◽  
L. H. Lewis ◽  
J. Kim ◽  
K. Barmak
Keyword(s):  
Compositional Gradient ◽  
Bilayer Films ◽  
Exchange Spring ◽  
Magnetic Signature

scholarly journals Exchange-spring behavior in epitaxial hard/soft magnetic bilayer films

1998 ◽  
Vol 83 (11) ◽  
pp. 6238-6240 ◽  
Author(s):  
J. S. Jiang ◽  
Eric E. Fullerton ◽  
M. Grimsditch ◽  
C. H. Sowers ◽  
S. D. Bader
Keyword(s):  
Soft Magnetic ◽  
Bilayer Films ◽  
Exchange Spring

Brillouin light scattering study of spin waves in NiFe/Co exchange spring bilayer films

2014 ◽  
Vol 115 (13) ◽  
pp. 133901 ◽  
Author(s):  
Arabinda Haldar ◽  
Chandrima Banerjee ◽  
Pinaki Laha ◽  
Anjan Barman
Keyword(s):  
Light Scattering ◽  
Spin Waves ◽  
Brillouin Light Scattering ◽  
Bilayer Films ◽  
Exchange Spring ◽  
Scattering Study

High-Temperature Synthesis of CdSe-Based Core/Shell, Core/Shell/Shell, and Core/Graded-Shell Nanoplatelets for Stable and Efficient Narrowband Emitters

2019 ◽  
Author(s):  
Aurelio A. Rossinelli ◽  
Henar Rojo ◽  
Aniket S. Mule ◽  
Marianne Aellen ◽  
Ario Cocina ◽  
...  
Keyword(s):  
Quantum Dots ◽  
High Temperature ◽  
Equilibrium Shape ◽  
Size Variation ◽  
Crystal Defects ◽  
Atomic Scale ◽  
Quantum Yields ◽  
Core Shell ◽  
Compositional Gradient ◽  
High Quality

<div>Colloidal semiconductor nanoplatelets exhibit exceptionally narrow photoluminescence spectra. This occurs because samples can be synthesized in which all nanoplatelets share the same atomic-scale thickness. As this dimension sets the emission wavelength, inhomogeneous linewidth broadening due to size variation, which is always present in samples of quasi-spherical nanocrystals (quantum dots), is essentially eliminated. Nanoplatelets thus offer improved, spectrally pure emitters for various applications. Unfortunately, due to their non-equilibrium shape, nanoplatelets also suffer from low photo-, chemical, and thermal stability, which limits their use. Moreover, their poor stability hampers the development of efficient synthesis protocols for adding high-quality protective inorganic shells, which are well known to improve the performance of quantum dots. <br></div><div>Herein, we report a general synthesis approach to highly emissive and stable core/shell nanoplatelets with various shell compositions, including CdSe/ZnS, CdSe/CdS/ZnS, CdSe/Cd<sub>x</sub>Zn<sub>1–x</sub>S, and CdSe/ZnSe. Motivated by previous work on quantum dots, we find that slow, high-temperature growth of shells containing a compositional gradient reduces strain-induced crystal defects and minimizes the emission linewidth while maintaining good surface passivation and nanocrystal uniformity. Indeed, our best core/shell nanoplatelets (CdSe/Cd<sub>x</sub>Zn<sub>1–x</sub>S) show photoluminescence quantum yields of 90% with linewidths as low as 56 meV (19.5 nm at 655 nm). To confirm the high quality of our different core/shell nanoplatelets for a specific application, we demonstrate their use as gain media in low-threshold ring lasers. More generally, the ability of our synthesis protocol to engineer high-quality shells can help further improve nanoplatelets for optoelectronic devices.</div>

scholarly journals Exchange-spring mechanism and Griffiths-like phase in room-temperature magnetoelectric Ni–BaTiO3 composites

2021 ◽  
Author(s):  
Ramany Revathy ◽  
Nandakumar Kalarikkal ◽  
Manoj Raama Varma ◽  
Kuzhichalil Peethambharan Surendran
Keyword(s):  
Room Temperature ◽  
First Report ◽  
Magnetoelectric Composites ◽  
Exchange Spring ◽  
Spring Mechanism

This is the first report on the occurrence of the exchange spring mechanism and a Griffiths-like phase in Ni–BaTiO3 magnetoelectric composites with 0–3 and 1–3 connectivity.

scholarly journals Development of PE/PCL Bilayer Films Modified with Casein and Aluminum Oxide

Molecules ◽  
2021 ◽  
Vol 26 (11) ◽  
pp. 3090
Author(s):  
Anita Ptiček Siročić ◽  
Ana Rešček ◽  
Zvonimir Katančić ◽  
Zlata Hrnjak-Murgić
Keyword(s):  
Mechanical Properties ◽  
Thermal Properties ◽  
Water Vapor ◽  
Aluminum Oxide ◽  
Water Vapor Permeability ◽  
Vapor Permeability ◽  
Mechanical And Thermal Properties ◽  
Oxide Compound ◽  
Bilayer Films ◽  
Oxide Particles

The studied samples were prepared from polyethylene (PE) polymer which was coated with modified polycaprolactone (PCL) film in order to obtain bilayer films. Thin PCL film was modified with casein/aluminum oxide compound to enhance vapor permeability as well as mechanical and thermal properties of PE/PCL films. Casein/aluminum oxide modifiers were used in order to achieve some functional properties of polymer film that can be used in various applications, e.g., reduction of water vapor permeability (WVTR) and good mechanical and thermal properties. Significant improvement was observed in mechanical properties, especially in tensile strength as well as in water vapor values. Samples prepared with aluminum oxide particles indicated significantly lower values up to 60%, and samples that were prepared with casein and 5% Al2O3 showed the lowest WVTR value.

Exchange spring behaviour in BaFe12O19/CoFe2O4 magnetic nanocomposites

2021 ◽  
Vol 868 ◽  
pp. 159072
Author(s):  
Lama Rifai ◽  
Farah Fattouh ◽  
Khulud Habanjar ◽  
Nader Yaacoub ◽  
Ramadan Awad
Keyword(s):  
Magnetic Nanocomposites ◽  
Exchange Spring

Feasibility of Using Magnetic Properties for Assessment of Particle-Associated Contaminated Transport

1996 ◽  
Vol 31 (4) ◽  
pp. 741-752 ◽  
Author(s):  
T. Mayer ◽  
W.A. Morris ◽  
K.J. Versteeg
Keyword(s):  
Heavy Metal ◽  
Bottom Sediments ◽  
Magnetic Measurements ◽  
Analytical Techniques ◽  
Suspended Sediments ◽  
Hamilton Harbour ◽  
Data Comparison ◽  
Depositional Processes ◽  
Magnetic Signature ◽  
Contaminants Transport

Abstract The desire to develop rapid tools for monitoring particle-associated contaminants transport in Hamilton Harbour has led the search for fast and inexpensive tests that could be used as screening procedures prior to labour- and time-intensive conventional analytical techniques. Magnetic property measurements promised to be a viable technique if it can be shown that there is a relation between this property and contaminant concentrations in suspended and bottom sediments. Correlation between magnetic susceptibility and heavy metal concentrations in suspended and bottom sediments from Hamilton Harbour is investigated. Analyses of results from six stations and two core samples indicate that magnetic measurements provide a meaningful proxy for heavy metal analyses, and that post-depositional processes produce only very limited changes in either the magnetic and/or chemical data. Comparison of the magnetic signature and chemistry of the suspended sediments suggests that susceptibility can be used to rapidly map plume patterns in the water column.

Strain relaxation in AlN/GaN bilayer films grown on γ-LiAlO2(100) for nanoelectromechanical systems

2004 ◽  
Vol 84 (23) ◽  
pp. 4756-4758 ◽  
Author(s):  
Y. Takagaki ◽  
Y. J. Sun ◽  
O. Brandt ◽  
K. H. Ploog
Keyword(s):  
Strain Relaxation ◽  
Nanoelectromechanical Systems ◽  
Bilayer Films

scholarly journals Magnetic stability in exchange-spring and exchange-bias systems after multiple switching cycles

2001 ◽  
Vol 89 (11) ◽  
pp. 6817-6819 ◽  
Author(s):  
J. S. Jiang ◽  
A. Inomata ◽  
C.-Y. You ◽  
J. E. Pearson ◽  
S. D. Bader
Keyword(s):  
Exchange Bias ◽  
Exchange Spring ◽  
Magnetic Stability ◽  
Multiple Switching
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