MAGNETIC PROPERTY AND CRITICAL CURRENT OF BiSrCaCuO SYSTEM UNDER LOW MAGNETIC FIELD

1989 ◽  
Vol 03 (06) ◽  
pp. 505-508
Author(s):  
L.Z. CAO ◽  
Y. YUE ◽  
J. WANG ◽  
S.D. MAO ◽  
H.B. LIU ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Property ◽  
Critical Current ◽  
Critical Field ◽  
Current Density ◽  
Pinning Force ◽  
Earth’S Magnetic Field ◽  
Earth's Magnetic Field ◽  
Low Magnetic Field ◽  
The Magnetic Field

The low critical field H c1 is determined by a.c.χ versus H and M versus H. For a sample of BiSrCaCuO with T c (0)=89 K , H c1 is equal to 17.5 Oe at 77 K. Measurement of the critical current Jc under low magnetic field shows that there is a peak on J c -H curve at about 1 Oe due to the existence of the earth’s magnetic field and the current density is very small in the BiSrCaCuO system and J c is nearly zero when the magnetic field reaches 150 Oe. It is suggested that the pinning force is very weak in this material.

Critical Current Densities in Bi2Sr2Cacu2O8+D

1989 ◽  
Vol 169 ◽  
Author(s):  
Shunji Nomura ◽  
Yutaka Yamada ◽  
Tomohisa Yamashita ◽  
Eriko Yoneda ◽  
Hisashi Yoshino ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Flux Pinning ◽  
Pinning Force ◽  
Critical Fields ◽  
Current Densities ◽  
Upper Critical Fields ◽  
The Magnetic Field

AbstractCritical current densities and upper critical fields were measured for a single crystal of the high Tc oxide superconductor, Bi2Sr2CaCu2O8+d, within the ab basal plane and along the c axis. The anisotropy in critical current densities was observed to be Jc⊥/Jc//=10 in agreement with the anisotropy in resistivity for the normal state. The magnetic field dependence of the critical current densities can be interpreted by the anisotropy in the upper critical fields. The scaling of the critical current density with the magnetic field was found. The critical current density scaled to zero at fields Bc2 in the ab plane and along the c axis which were in good agreement with the upper critical fields measured by transport.The anisotropy in flux pinning force density along the b axis, Fp//b, and along the a axis, Fp//a, was found to be Fp//b/Fp//a=3. The data provided strong evidence for flux pinning by the modulated structure in this system.

The Critical Current Density and the Curvature of the Magnetic Field in Epitaxial YBaCuO Films

1992 ◽  
Vol 170 (2) ◽  
pp. 549-562 ◽  
Author(s):  
D. Glatzer ◽  
A. Forkl ◽  
H. Theuss ◽  
H. U. Habermeier ◽  
H. Kronmüller
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
The Magnetic Field

PINNING FORCE DENSITY IN YBa2Cu3O7-FILMS AND YBa2Cu3O7/PrBa2Cu3O7-SUPERLATTICES

1993 ◽  
Vol 07 (01n03) ◽  
pp. 135-138
Author(s):  
M. SCHMITT ◽  
T. KLUGE ◽  
C. TOMÉ ROSA ◽  
G. JAKOB ◽  
P. WAGNER ◽  
...  
Keyword(s):  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Low Temperatures ◽  
Force Density ◽  
Pinning Force ◽  
Axis Of Rotation ◽  
Current Flows ◽  
The Magnetic Field ◽  
Pinning Force Density

The in plane critical current density jc (B, Θ, T) of dc-sputtered YBa 2 Cu 3 O 7-films and YBa 2 Cu 3 O 7/ PrBa 2 Cu 3 O 7-superlattices was measured in dependence of the angle Θ between the magnetic field [Formula: see text] and the [Formula: see text]-axis of the films in two orientations: 1. The current direction is parallel to the axis of rotation (i.e. [Formula: see text] always). 2. The current flows perpendicular to the axis of rotation (i. e. [Formula: see text]). For low temperatures we do not find any difference between the two current orientations, and the critical current density [Formula: see text] behaves like jc (B cos Θ, 0°). For higher temperatures the two cases differ from each other for Θ near to the maxima in jc at 90° and 270° for the YBa 2 Cu 3 O 7-films whereas for YBa 2 Cu 3 O 7/ PrBa 2 Cu 3 O 7-superlattices we hardly find any change for both experimental setups. We compare the behaviour of the experimental results for the two orientations for the YBa 2 Cu 3 O 7-films and YBa 2 Cu 3 O 7/ PrBa 2 Cu 3 O 7-superlattices and discuss the temperature dependence of the intrinsic pinning force density.

Effect of Pulsed Magnetic Field Processing on MgB2 Superconductors

2007 ◽  
Vol 546-549 ◽  
pp. 2063-2066 ◽  
Author(s):  
W.X. Li ◽  
Ying Li ◽  
M.Y. Zhu ◽  
R.H. Chen ◽  
H.M. Jin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Current Density ◽  
Pulsed Magnetic Field ◽  
Pinning Force ◽  
Critical Current Density Jc ◽  
Mgb2 Superconductors ◽  
Doped Mgb2 ◽  
Flux Pinning Force

Pulsed magnetic field was first employed in the study on MgB2 superconductors. Superconductivity properties and microstructures of Zn and SiC doped MgB2 were discussed in this paper. The superconductors showed different superconductivities after magnetic sintering. Critical current density and flux pinning force were relevant to the dopants properties in MgB2. Grains in the pulsed magnetic processed MgB2 matrix were smaller than those in the normal processed one. The refinement microstructures have caused the critical current density (Jc) anisotropy in both the Zn and SiC doped MgB2.

Effect of microstructure on the magnetic-field dependence of the local critical current density inYBa2Cu3O7−δsuperconductors

1992 ◽  
Vol 46 (17) ◽  
pp. 10986-10996 ◽  
Author(s):  
L. M. Fisher ◽  
V. S. Gorbachev ◽  
N. V. Il’in ◽  
N. M. Makarov ◽  
I. F. Voloshin ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Critical Current Density ◽  
Critical Current ◽  
Field Dependence ◽  
Current Density ◽  
Magnetic Field Dependence ◽  
The Magnetic Field ◽  
Effect Of Microstructure

scholarly journals Magnetic maps in animal navigation

2022 ◽  
Author(s):  
Kenneth J. Lohmann ◽  
Kayla M. Goforth ◽  
Alayna G. Mackiewicz ◽  
Dana S. Lim ◽  
Catherine M. F. Lohmann
Keyword(s):  
Magnetic Field ◽  
Positional Information ◽  
Natal Philopatry ◽  
Earth’S Magnetic Field ◽  
Long Distance ◽  
Natal Homing ◽  
Potential Source ◽  
Animal Navigation ◽  
Earth's Magnetic Field ◽  
The Magnetic Field

AbstractIn addition to providing animals with a source of directional or ‘compass’ information, Earth’s magnetic field also provides a potential source of positional or ‘map’ information that animals might exploit to assess location. In less than a generation, the idea that animals use Earth’s magnetic field as a kind of map has gone from a contentious hypothesis to a well-established tenet of animal navigation. Diverse animals ranging from lobsters to birds are now known to use magnetic positional information for a variety of purposes, including staying on track along migratory pathways, adjusting food intake at appropriate points in a migration, remaining within a suitable oceanic region, and navigating toward specific goals. Recent findings also indicate that sea turtles, salmon, and at least some birds imprint on the magnetic field of their natal area when young and use this information to facilitate return as adults, a process that may underlie long-distance natal homing (a.k.a. natal philopatry) in many species. Despite recent progress, much remains to be learned about the organization of magnetic maps, how they develop, and how animals use them in navigation.

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