Melt-textured YBaCuO with High Trapped Fields up to 1.3 T at 77 K

2000 ◽  
Vol 15 (6) ◽  
pp. 1231-1234 ◽  
Author(s):  
H. Walter ◽  
M. P. Delamare ◽  
B. Bringmann ◽  
A. Leenders ◽  
H. C. Freyhardt
Keyword(s):  
Magnetic Field ◽  
Growth Process ◽  
Field Measurements ◽  
Transport Critical Current Density ◽  
Zero Field ◽  
Standard Samples ◽  
Trapped Field ◽  
Trapped Magnetic Field ◽  
Suitable Temperature ◽  
Scanning Electron

CeO2-doped YBaCuO monoliths synthesized with a top-seeded melt growth process in a conventional box furnace exhibited values of trapped magnetic field of up to 1.33 T at 77 K. To our knowledge, this is the highest value of trapped field reported for a melt-textured YBaCuO monolith. A suitable temperature profile and the use of high-density Y2BaCuO5 substrates led to reproducible single-domain crack-free samples investigated by optical and scanning electron microscopy and trapped field measurements. The zero-field-cooled levitation forces at 77 K of standard samples amounted to 70–83 N. A transport critical current density of up to 1.3 × 105 A/cm2 in self field at 77 K was obtained.

scholarly journals Hierarchical aligned ZnO nanorods on surface of PVDF/Fe2O3 nanofibers by electrospinning in a magnetic field

2021 ◽  
pp. 130-130
Author(s):  
Dan Tian ◽  
Peng Liu ◽  
Ji-Huan He
Keyword(s):  
Magnetic Field ◽  
Growth Process ◽  
Zno Nanorods ◽  
Fe2o3 Nanoparticles ◽  
Electron Micrograph ◽  
Scanning Electron Micrograph ◽  
Aligned Nanofibers ◽  
Hierarchical Composites ◽  
Nanofiber Mats ◽  
Scanning Electron

The electrospinning was applied to fabricate aligned nanofibers in a magnetic field. Fe2O3 nanoparticles were added to PVDF/Zn(CHCOOH)2solution, and heat treatment of the nanofiber mats was made to produce PVDF/Fe2O3nanofibers containing ZnO nanoparticles. Hierarchical composites were obtained via a facile hydrothermal growth process, where radially oriented ZnO nanorods were found. The morphology of the as-synthesized samples were investigated by using the scanning electron micrograph (SEM).

Magnetic Field Sensing with Atomic Scale Defects in SiC Devices

2016 ◽  
Vol 858 ◽  
pp. 265-268 ◽  
Author(s):  
Corey J. Cochrane ◽  
Jordana Blacksberg ◽  
Patrick M. Lenahan ◽  
Mark A. Anders
Keyword(s):  
Magnetic Field ◽  
Semiconductor Industry ◽  
High Sensitivity ◽  
Field Measurements ◽  
Wide Bandgap ◽  
Atomic Scale ◽  
Zero Magnetic Field ◽  
Zero Field ◽  
Field Sensing ◽  
Magnetic Field Sensing

Silicon carbide (SiC) is well known by the semiconductor industry to have significant potential for electronics used in high temperature environments due to its wide bandgap. It is not so well-known, however, that SiC also has great potential in the area of magnetic field sensing. Using the recently demonstrated zero-field spin dependent recombination (SDR) phenomenon that naturally arises in SiC based devices, near-zero magnetic field measurements can be made with moderately high sensitivity.

Temperature Dependence of the NQR Frequency and Linewidth of the High-J c Superconductor YBa 2 Cu 3 0 7 _ 5

1990 ◽  
Vol 45 (3-4) ◽  
pp. 419-422 ◽  
Author(s):  
H. Riesemeier ◽  
J. Pattloch ◽  
E.W. Scheidt ◽  
M. Schaefer ◽  
K. Lüders
Keyword(s):  
Magnetic Field ◽  
Transition Temperature ◽  
Zero Field ◽  
Dc Magnetic Field ◽  
Grain Sizes ◽  
Trapped Magnetic Field ◽  
Temperature Dependences ◽  
Powder Samples ◽  
Signal Intensities ◽  
Cooling Procedure

Abstract For YBa2Cu3O7-δ a powder samples of different average grain sizes the temperature dependences of 63Cu NQR frequencies and signal intensities are reported for the Cu (1) site in a temperature range of 4 300 K. Both quantities show a non-monotonic behaviour in the vicinity of the superconduction transition temperature Tc . In the superconducting state the line shape of the NQR signal in zero-field depends on the strength of the dc magnetic field applied during the cooling-procedure. The resulting linewidth yields information about the internal trapped magnetic field.

scholarly journals A trapped magnetic field of 3 T in homogeneous, bulk MgB2superconductors fabricated by a modified precursor infiltration and growth process

2016 ◽  
Vol 29 (3) ◽  
pp. 035008 ◽  
Author(s):  
A G Bhagurkar ◽  
A Yamamoto ◽  
L Anguilano ◽  
A R Dennis ◽  
J H Durrell ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Growth Process ◽  
Trapped Magnetic Field

Trapped Magnetic Field in Proton Irradiated Melt-Textured Y-Ba-Cu-O Superconductors

1991 ◽  
Vol 235 ◽  
Author(s):  
In-Gann Chen ◽  
Jianxiong Liu ◽  
Roy Weinstein
Keyword(s):  
Magnetic Field ◽  
Current Model ◽  
High Energy ◽  
Mapping Method ◽  
Mapping Technique ◽  
High Energy Proton ◽  
Field Mapping ◽  
Trapped Field ◽  
Trapped Magnetic Field ◽  
Energy Proton

ABSTRACTThe trapped magnetic fields in high energy proton irradiated melt-textured Y-Ba-Cu-O (MT-Y123) high temperature superconductors (HTS) materials have been studied. Prototype of mini-magnet, about 1 cm3 which retains about 14, 200 G @ 77 K, has been made with these proton irradiated samples. Quasi-persistent magnetic field near 3 to 5 Tesla in liquid nitrogen is feasible with our current MT-Y123 samples. Two types of motors have been tested successfully by replacing metallic permanent magnet with the trapped field in MT-Y123 samples.The trapped magnetic field mapping technique is used to study the superconducting properties of the MT-Y123 materials. Granular structures in MT-Y123 samples can be observed directly by the field mapping method. A phenomenological current model has been developed to account for the trapped field intensity and profile in HTS samples. The trapped field can be reproduced very well by this model. Remenant magnetic moment trapped by MT-Y123 samples measured by this mapping method and by standard VSM will be discussed. The effect of high energy proton (160–210 MeV) bombardment on the field trapping capability and stability will be discussed.

Non Trivial Processes for Obtaining Bi-Based High Tc Superconductors

1998 ◽  
Vol 547 ◽  
Author(s):  
R. Cloots ◽  
M. Ausloos
Keyword(s):  
Magnetic Field ◽  
Growth Process ◽  
Main Axis ◽  
Ac Magnetic Susceptibility ◽  
X Ray Diffraction ◽  
High Tc Superconductors ◽  
High Tc ◽  
X Ray ◽  
Melt Texturing ◽  
Scanning Electron

AbstractDysprosium doped Bi-based 2212 ceramics were synthesized by a melt-texturing growth process in a 1.2T magnetic field, applied perpendicularly to the main axis of a cylindrically shaped sample. The materials were characterized by X-ray diffraction, optical and scanning electron microscopy and energy dispersive X-ray analyses. The texturing process was optimized with respect to the sample electrical resistivity and AC magnetic susceptibility.

A New Class of Permanent Magnets - High Temperature Superconductors

1991 ◽  
Vol 232 ◽  
Author(s):  
In-Gann Chen ◽  
Jay Liu ◽  
Roy Weinstein
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
High Temperature Superconductor ◽  
Permanent Magnets ◽  
High Temperature Superconductors ◽  
Type Ii ◽  
Type Ii Superconductors ◽  
Trapped Field ◽  
New Class ◽  
Trapped Magnetic Field

ABSTRACTFor type II superconductors (SC), magnetic field can be trapped, or pinned due to persistent internal current. Upon magnetization, SC samples behave in some ways similar to a metallic permanent magnet. The trapped field is high and quasi-persistent, and we refer to it as a “magnet replica”. So far, nearly 1T @ 65 K, and over 0.4 T @ 77 K have been measured within small (about 1 × 1 × 0.6 cm3) melt-textured Yba2Cu3Ox (MT-Y123) samples. Based on our theoretical studies, extrapolation to larger scale magnets indicates that 2–4 Tesla in liquid Nitrogen (and even larger field at lower temperatures) is achievable with our high temperature superconductor (HTS) material. Using this effect, magnets with dipole, quadrupole, or more complicated configurations can be made of existing MT-Y123 material, thus bypassing the need for HTS wires. Two types of motors have been successfully constructed, using the trapped field in MT-Y123 samples.The spatial distribution of the trapped magnetic field on MT-Y123 materials has been studied. A phenomenological model has been developed to account for the trapped field intensity and profile in HTS samples. General features of magnet replicas by HTS will also be discussed.

VORTEX MAGNETISM IN THE HIGH-TEMPERATURES SUPERCONDUCTOR La2-xSrxCuO4

2002 ◽  
Vol 16 (20n22) ◽  
pp. 3155-3155
Author(s):  
B. LAKE ◽  
T. E. MASON ◽  
G. AEPPLI ◽  
K. LEFMANN ◽  
N. B. CHRISTENSEN ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Normal State ◽  
Cuprate Superconductors ◽  
High Temperature Superconductivity ◽  
Field Measurements ◽  
Spin Fluctuations ◽  
Magnetic Interactions ◽  
Zero Field ◽  
Zero Resistance ◽  
Lower Temperature

There is strong evidence that magnetic interactions play a crucial role in the mechanism driving high-temperature superconductivity in cuprate superconductors. To investigate this further we have done a series of neutron scattering measurements on La 2-x Sr x CuO 4 (LSCO) in an applied magnetic field. Below Tc the field penetrates the superconductor via an array of normal state metallic inclusions or vortices. Phase coherent superconductivity characterized by zero resistance sets in at the lower field-dependent irreversibility temperature (Tirr). We have measured optimally doped LSCO (x = 0.16, Tc = 38.5 K ) and underdoped LSCO (x = 0.10, Tc = 29 K ); both have an enhanced antiferromagnetic response in a field. Measurements of the optimally doped system at H = 7.5 T show that sub-gap spin fluctuations first disappear with the loss of finite resistivity at Tirr, but then reappear at a lower temperature with increased lifetime and correlation length compared to the normal state. In the underdoped system elastic antiferromagnetism develops below Tc in zero field, and is significantly enhanced by application of a magnetic field. Phase coherent superconductivity is then established within the antiferromagnetic phase at Tirr; thus, the situation in underdoped LSCO is the reverse of that for the optimally doped LSCO where the zero-resistance state develops first before the onset of antiferromagnetism.

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