scholarly journals Low temperature characterization of high efficiency spin-filter Josephson junctions

2020 ◽  
Vol 233 ◽  
pp. 05007
Author(s):  
Roberta Caruso ◽  
Halima Giovanna Ahmad ◽  
Avradeep Pal ◽  
Giovanni Piero Pepe ◽  
Davide Massarotti ◽  
...  
Keyword(s):  
Low Temperature ◽  
Josephson Junctions ◽  
High Efficiency ◽  
Cooper Pairs ◽  
Spin Filter ◽  
Wide Range ◽  
Ferromagnetic Nature ◽  
Consistent Picture ◽  
Super Conducting

The interplay between superconducting and ferromagnetic order pa¬rameters in S/F interfaces gives rise to a wide range of peculiar properties with applications in high-efficiency computation and in the emerging field of super¬conducting spintronics. In NbN/GdN/NbN Josephson junctions, GdN barriers give unique properties due to the double insulting and ferromagnetic nature of the material, as demonstrated in previous works. Here we focus on tunneling spectroscopy of these junctions down to 0.3 K when changing the barrier thick¬ness, which contributes to complete a consistent picture on the physics of these junctions and supports the previous indications of equal-spin Cooper pairs con¬tributing to the total supercurrent of the devices.

Low temperature properties of spin filter NbN/GdN/NbN Josephson junctions

2017 ◽  
Vol 533 ◽  
pp. 53-58 ◽  
Author(s):  
D. Massarotti ◽  
R. Caruso ◽  
A. Pal ◽  
G. Rotoli ◽  
L. Longobardi ◽  
...  
Keyword(s):  
Low Temperature ◽  
Josephson Junctions ◽  
Spin Filter

Anisotropic Thermal Diffusivity Measurements in Nanostructured Samples Using a Photothermoelectric Technique

2006 ◽  
Author(s):  
Youngsuk Son ◽  
Monalisa Mazumder ◽  
Theodorian Borca-Tasciuc
Keyword(s):  
Thermal Properties ◽  
Transport Properties ◽  
Thermal Transport ◽  
High Efficiency ◽  
Thermal Characterization ◽  
Thermal Anisotropy ◽  
Thermal Transport Properties ◽  
Wide Range ◽  
Photothermoelectric Technique

Knowledge of the thermal transport properties in thin films and nanostructures is critical for a wide range of applications in microelectronics, photonics, micro-electro-mechanical-systems, and thermoelectrics. The last twenty years have seen significant developments in thin-film thermal characterization techniques. Despite these advances, the characterization of the thermal transport properties in low-dimensional systems remains a challenging task. Recently, thermal properties of nanowire/nanotube nanocomposites such as thermoelectric nanowires and aligned carbon nanotubes (CNT) deposited on silicon substrates or in alumina or polymer matrix have attracted a great interest due to their possible applications in high efficiency thermoelectric energy conversion and thermal management applications. However, a major challenge for thermal characterization of nanowire/nanotube composites is their thermal anisotropy. This work presents measurements of anisotropic thermal properties using a photothermoelectric technique.

Effects of Silver Paste Application on Embedded Channels in Low Temperature Co-fired Ceramics

2009 ◽  
Vol 6 (1) ◽  
pp. 54-58 ◽  
Author(s):  
Douglas L. Kellis ◽  
Amy J. Moll ◽  
Donald G. Plumlee
Keyword(s):  
Low Temperature ◽  
Single Layer ◽  
Catalytic Decomposition ◽  
Lower Surface ◽  
Channel Geometry ◽  
Silver Paste ◽  
Wide Range ◽  
Primary Focus ◽  
Final Channel

A monopropellant micropropulsion device is being developed in low-temperature cofired ceramics (LTCC). The device uses catalytic decomposition of hydrogen peroxide as a propellant: hence catalytic channels are embedded internally in these devices. Consistent construction of these channels depends on a wide range of variables both in the design and fabrication of the channel structures. The primary focus of this paper is the characterization of final channel geometry when silver paste is applied to the upper and lower surfaces of an embedded single layer channel. Application of silver paste to the upper and lower channel surfaces has been shown to alter the final shape of the channels within the test structure. Upper and lower surface deflection into the channel area is discussed and characterization of this phenomena is illustrated as a function of channel width. A design of experiment (DOE) method is used to explore how process parameters affect the channel geometry/integrity. Construction of the test structures includes the use of pressure sensitive adhesives and a sacrificial material to maintain the overall channel geometry/integrity. Lamination and firing profiles are modified in order to enhance this construction methodology. Techniques used to produce and characterize these channels are discussed as well as the methods used to maintain channel geometry/integrity.

Characterization of Low Temperature Sintered Ferrite Laminates for High Frequency Point-of-Load Converters

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000293-000302
Author(s):  
Wenli Zhang ◽  
Mingkai Mu ◽  
Dongbin Hou ◽  
Yipeng Su ◽  
Qiang Li ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Low Temperature ◽  
Power Density ◽  
High Frequency ◽  
High Efficiency ◽  
Core Loss ◽  
Chemical Compositions ◽  
Zn Ferrite ◽  
Dc Bias

The high power density Point-of-Load (POL) converter with high operating frequency has gained increasing interest in the growing market for portable communications and handheld electronics. Low profile magnetic components and associated integration techniques are desired for design and fabrication of highly integrated POL converters. Low fired ferrite tapes for multilayer chip inductors and high frequency applications have been developed and used in hybrid integration of power modules. The inductor made of multilayer ferrites can be fabricated as the magnetic substrate in an integrated POL converter with active components on top. The developed 3-D integration approach is applied to reduce footprint and increase power density for the high frequency POL converter. The current work reports the characterization of magnetic properties, microstructures, and chemical compositions of commercially available low-fire Ni-Cu-Zn ferrite materials (ESL 40010, 40011, and 40012) and their mixed laminates. Permeability and core loss density are measured on toroidal shaped samples sintered at 885 °C for 3.5 hrs. Because high DC current is always applied to bias the core for the inductors used in high frequency POL converters, the influence of superimposed DC bias on the magnetic properties of ferrite laminates has also been evaluated. The microstructures and chemical compositions of low temperature sintered ferrite laminates are observed and analyzed in order to explain the difference of magnetic properties among samples. The mixed laminate with alternating layers of ESL 40010 and ESL 40012 in 1:1 ratio presents the highest permeability and the lowest core loss density among all examined samples when DC bias is above 1000 A/m. Finally, a 12 V to 1.2 V, 15 A, high frequency (1.5–5 MHz) integrated POL converter with laminated ferrite inductor has been fabricated and demonstrated working at high efficiency with power density as high as 1000 W/in3.

scholarly journals Reaction and Characterization of Low-Temperature Effect of Transition Nanostructure Metal Codoped SCR Catalyst

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Ke Yang ◽  
Weiwei Xiao ◽  
Quan Xu ◽  
Jiaojiao Bai ◽  
Yan Luo ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Low Temperature ◽  
Temperature Effect ◽  
Conversion Efficiency ◽  
High Efficiency ◽  
Scr Catalyst ◽  
No Conversion ◽  
Type Semiconductor ◽  
P Type

Typical p-type semiconductor MnOx codoped with n-type semiconductors such as CeO2 and V2O5 was reported to achieve high efficiency in catalytic NOx removal by NH3. In this paper, we present novel Mn-Ce codoped V2O5/TiO2 catalyst which exhibited an excellent NO conversion efficiency of 90% at 140°C. By using this codoped catalyst, the best low-temperature activity was greatly decreased when compared with single Mn- or Ce-doped catalyst. According to the characterization results from BET, XRD, and XPS, the codoped catalyst was composed of both CeO2 and amorphous Mn. The electron circulation formed between doping elements is believed to promote the electron transfer, which may be one of the reasons for excellent low-temperature denitration performance.

Characterization of Low Temperature SiNx Films for 3D/2.5D-IC TSV

2015 ◽  
Vol 135 (7) ◽  
pp. 733-738 ◽  
Author(s):  
Yasushi Kobayashi ◽  
Yoshihiro Nakata ◽  
Tomoji Nakamura ◽  
Mayumi B. Takeyama ◽  
Masaru Sato ◽  
...  
Keyword(s):  
Low Temperature

Synthesis of Elaborate Benzofuran-2-Carboxamide Derivatives Through a Combination of 8-Aminoquinoline Directed C–H Arylations and Transamidations

2019 ◽  
Author(s):  
Michael Oschmann ◽  
Linus Johansson Holm ◽  
Oscar Verho
Keyword(s):  
Small Molecule ◽  
High Efficiency ◽  
Synthetic Strategy ◽  
Small Molecule Screening ◽  
Physiological Properties ◽  
Wide Range ◽  
Directing Group ◽  
Synthetic Sequence

Benzofurans are everywhere in nature and they have been extensively studied by medicinal chemists over the years because of their chemotherapeutic and physiological properties. Herein, we describe a strategy that can be used to access elaborate benzo-2-carboxamide derivatives, which involves a synthetic sequence of 8-aminoquinoline directed C–H arylations followed by transamidations. For the directed C–H arylations, Pd catalysis was used to install a wide range of aryl and heteroaryl substituents at the C3 position of the benzofuran scaffold in high efficiency. Directing group cleavage and further diversification of the C3-arylated benzofuran products were then achieved in a single synthetic operation through the utilization of a two-step transamidation protocol. By bocylating the 8-aminoquinoline amide moiety of these products, it proved possible to activate them towards aminolysis with different amine nucleophiles. Interestingly, this aminolysis reaction was found to proceed efficiently without the need of any additional catalyst or additive. Given the high efficiency and modularity of this synthetic strategy, it constitute a very attractive approach for generating structurally-diverse collections of benzofuran derivatives for small molecule screening.

To the 70th anniversary of World Meteorological Organization. Scientific and technical cooperation of Hydrometeorological Center of the USSR/Russia in the Programs of World Meteorological Organization

2020 ◽  
pp. 117-138
Author(s):  
S.V. Borshch ◽  
◽  
R.M. Vil’fand ◽  
D.B. Kiktev ◽  
V.M. Khan ◽  
...  
Keyword(s):  
Environmental Monitoring ◽  
High Efficiency ◽  
World Meteorological Organization ◽  
70Th Anniversary ◽  
Technical Level ◽  
Technical Cooperation ◽  
Wide Range

The paper presents the summary and results of long-term and multi-faceted experience of international scientific and technical cooperation of Hydrometeorological Center of Russia in the field of hydrometeorology and environmental monitoring within the framework of WMO programs, which indicates its high efficiency in performing a wide range of works at a high scientific and technical level. Keywords: World Meteorological Organization, major WMO programs, representatives of Hydrometeorological Center of Russia in WMO

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