Magnetic Measurements on YBa(2)Cu(3)O(x) Ceramic High Temperature Superconductors

1987 ◽  
Vol 99 ◽  
Author(s):  
J. Cornelis ◽  
A. Van Den Bosch ◽  
J. Vansummeren ◽  
H. Ooms ◽  
R. Gilissen ◽  
...  
Keyword(s):  
Magnetic Measurements ◽  
High Temperature Superconductors ◽  
Constant Field ◽  
Induction Field ◽  
Magnetic Susceptibilities ◽  
Ceramic Disc ◽  
Magnetic Induction Field ◽  
Faraday Method ◽  
Flux Expulsion ◽  
Superconducting Ceramic

ABSTRACTStatic magnetic susceptibilities have been measured, following the Faraday method, on a disc of home-made YBa(2)Cu(3)O(x). The superconducting ceramic disc was oriented perpendicular to the applied magnetic induction field < 10 mT. On cooling the sample in a constant field from above to below the critical temperature a Meissner-Ochsenfeld effect is observed. The interpretation of the data yields partial flux expulsion. That the flux is not completely expelled from the sample is understood on the basis of the flatness of the disc. Part of the flux which had not been expelled by the Meissner-Ochsenfeld effect remains trapped in the cooled superconducting material.

Research on expanding the range of reproduction of magnetic flux density of the DC field of the state primary standard GET12-2011

2020 ◽  
pp. 3-7
Author(s):  
Vladlen Ya. Shifrin ◽  
Denis I. Belyakov ◽  
Alexander E. Shilov ◽  
Denis D. Kosenko
Keyword(s):  
Magnetic Flux ◽  
Magnetic Induction ◽  
Frequency Conversion ◽  
Magnetic Measurements ◽  
Primary Standard ◽  
Uncertainty Budget ◽  
The State ◽  
State Primary Standard ◽  
Magnetic Flux Density ◽  
Constant Field

The results of works aimed at increasing the level of uniformity of measurements of the magnetic induction of a constant field – the basic value in the field of magnetic measurements. A set of equipment for reproducing a unit of magnetic induction of a constant field in the range of 1–25 mT was created and described. The inclusion of this complex in the State primary standard of units of magnetic induction, magnetic flux, magnetic moment and magnetic induction gradient GET 12-2011 will ensure the reproduction and direct transmission of the unit of permanent magnetic induction in the ranges of not only weak (10–3–1 mT), but medium (1–25 mT) and strong (0.025–1 T) magnetic fields. A quantum cesium magnetometer based on the resolved structure of cesium atoms was created to transmit the unit of magnetic induction to the region of medium fields. The procedure for calculating the frequency conversion coefficients to magnetic induction of the created quantum cesium magnetometer is described. The uncertainty budget for reproducing a unit of magnetic induction of a constant field using the created complex is estimated.

Simplified Magnetic Induction Field of Magnetite Particles With Irregular Shape

2019 ◽  
Vol 55 (1) ◽  
pp. 1-5
Author(s):  
Jiangang Ku ◽  
Weixin Wu ◽  
Rongdong Deng ◽  
Weiran Zuo ◽  
Wanzhong Yin
Keyword(s):  
Magnetic Induction ◽  
Irregular Shape ◽  
Induction Field ◽  
Magnetic Induction Field ◽  
Magnetite Particles

scholarly journals An electron holography study of perpendicular magnetic tunnel junctions nanostructured by deposition on pre-patterned conducting pillars

Nanoscale ◽  
2020 ◽  
Vol 12 (33) ◽  
pp. 17312-17318
Author(s):  
V. Boureau ◽  
V. D. Nguyen ◽  
A. Masseboeuf ◽  
A. Palomino ◽  
E. Gautier ◽  
...  
Keyword(s):  
Magnetic Induction ◽  
Tunnel Junctions ◽  
Random Access ◽  
Magnetic Tunnel Junctions ◽  
Temperature Behavior ◽  
Electron Holography ◽  
Induction Field ◽  
Magnetic Induction Field

Electron holography investigation of the magnetic induction field of perpendicular magnetic tunnel junctions for the fabrication of magnetic random access memories (MRAM), and temperature behavior.

scholarly journals Magnetic Susceptibility of Soils from Eastern Botswana: A Reconnaissance Survey and Potential Applications

2015 ◽  
Vol 7 (4) ◽  
pp. 45 ◽  
Author(s):  
Rubeni Tawanda Ranganai ◽  
Moikwathai Moidaki ◽  
James G. King
Keyword(s):  
Magnetic Properties ◽  
Magnetic Susceptibility ◽  
Land Use Planning ◽  
Magnetic Measurements ◽  
Parent Material ◽  
Appreciable Amount ◽  
Frequency Dependent ◽  
Magnetic Susceptibilities ◽  
Basement Rocks ◽  
Rock And Soil

<p class="zhengwen">Soil magnetic properties measurements are relatively fast and inexpensive but have been proved to be sufficient for preliminary investigations in diverse socio-developmental issues. This paper presents results of a reconnaissance study of soil colour and magnetic susceptibility (c) in eastern Botswana, where ~80% of the population resides. The work is a first step to creating a database of rock and soil magnetic properties and to document spatial variations in magnetic properties in the country. These measurements are important as constraints for interpretation of available aeromagnetic data and can also be exploited for environmental soil research (pollution) and land-use planning (agriculture). The soils sampled include derivatives of varying types and provenance such as Archean gneissic granitoids, metamorphosed rocks (granulites), volcano-sedimentary assemblages, Karoo basalts, and alluvial sediments. A soil colour chart was used since soil colours and magnetic properties are diagnostic of its parent rock sources and weathering profiles. Soil magnetic susceptibilities were measured at both low frequency (0.46 MHz, clf) and high frequency (4.6 MHz, chf), thus allowing calculation of frequency-dependent susceptibility (cfd, cfd%) for detecting ultra-fine ferromagnetic minerals.</p>It was found that soils with Hues ranging from 7.5YR to 10YR have appreciable amount of magnetic materials and soils with Hues of 2.5YR are generally nonmagnetic. The results of soil magnetic susceptibility profiles show spatial variation closely related to the variation in basement rocks, which provides excellent evidence that the magnetic susceptibility variation reflects basement rocks or bedrock composition (soil parent material). In relation to the Botswana physiographic units, soils from the hardveld (Precambrian) show the highest susceptibilities, followed by those from the sandveld, with the lowest values being from the alluvial. The frequency dependent magnetic susceptibilities indicate the presence of ultra-fine super-paramagnetic minerals such as magnetite/maghemite. It is suggested that a systematic and continuous programme of rock and soil magnetic measurements would benefit various socio-economic and development priority sectors of Botswana. This also applies to many developing countries in Africa where soil physics and measurement of soil susceptibility in particular, is generally still at an embryonic stage.

Etude Magnétique des sels alcalins de quelques amino acides

1975 ◽  
Vol 53 (21) ◽  
pp. 3167-3170 ◽  
Author(s):  
Maurice A. Bernard ◽  
Nicole Bois ◽  
Michelle Daireaux
Keyword(s):  
Amino Acids ◽  
Alkali Metal ◽  
Metal Salts ◽  
Alkali Metal Salts ◽  
Magnetic Susceptibilities ◽  
Faraday Method

Using the Faraday method molar magnetic susceptibilities of the alkali metal salts M(NH2—R—COO) of several amino acids[Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text] [Formula: see text]have been determined.Using the Veiel method, the magnetic susceptibilities of the anions (NH2—R—COO−) were deduced.

Ultimate Resolution for Current Localization by Means of Magnetic Techniques

2009 ◽  
Author(s):  
Fulvio Infante ◽  
Mathieu Gabarrot ◽  
Philippe Perdu ◽  
Dean Lewis
Keyword(s):  
Integrated Circuits ◽  
Simulation Approach ◽  
Magnetic Current ◽  
Induction Field ◽  
Current Localization ◽  
Magnetic Induction Field ◽  
Defect Localization ◽  
Maximum Current ◽  
Magnetic Techniques ◽  
Working Distance

Abstract Defect localization is a very important step in the process of failure analysis for Integrated Circuits. A very important technique, allowing the localization of the defects with a certain degree of precision, is Magnetic Current Imaging. However, this technique has strict limitations related to the working distance and the maximum current magnitude detectable. We overcame these limitations by using a simulation approach, allowing us to sensibly increase the technique resolution and to map currents which are much weaker. This is done by comparing the measurement of the Magnetic Induction Field to a set of simulations of defect assumptions.

scholarly journals A method of measuring magnetic susceptibilities

1931 ◽  
Vol 132 (820) ◽  
pp. 442-459 ◽  
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Torsion Balance ◽  
The Body ◽  
Small Element ◽  
Uniform Field ◽  
Magnetic Susceptibilities ◽  
Wide Range ◽  
Faraday Method ◽  
The Magnetic Field

Among the different methods which can be used to measure the magnetic susceptibility of feebly magnetic substances, the most practical, and those most frequently employed at the present time, depend essentially on the measurement of the force acting on the substance when placed in a non-uniform field. This force is given by the well-known formula F x = χ ∫ v 0 H d H/d x d V, where χ is the volume susceptibility, (H) is the magnetic field, d H/ d x is the gradient of the magnetic field in the direction x in which the force is measured at the site of a small element of volume ( d V). Corresponding to the wide range of susceptibility, and to the different physical states and conditions which occur, a number of methods of measuring this force have been developed. In all these methods, since they are based on the measurement of the force on the substance, and since it is by the displacement of the body that the force is measured, it is essential that the body should be movable. The force acting on the body is small, usually only a few dynes, and delicate methods have to be used for making the measurements, as, for instance, in the Curie-Faraday method where the substance is carried on a sensitive torsion balance.

Low field magnetic measurements of high temperature superconductors

1989 ◽  
Author(s):  
G. Shaw ◽  
S.D. Murphy ◽  
Z.-Y. Li ◽  
A.M. Stewart ◽  
S.M. Bhagat
Keyword(s):  
High Temperature ◽  
Magnetic Measurements ◽  
High Temperature Superconductors ◽  
Low Field
Sign in / Sign up

Export Citation Format

Share Document