Determination of the paleomagnetic field intensity by the dispersion of the remanent magnetization vector of the sediment rocks

1971 ◽  
Vol 91 (1) ◽  
pp. 148-153
Author(s):  
D. Zidarov
Keyword(s):  
Field Intensity ◽  
Remanent Magnetization ◽  
Magnetization Vector

THE DESIGN AND TESTING OF AN ALTERNATING-FIELD DEMAGNETIZING APPARATUS

1965 ◽  
Vol 2 (6) ◽  
pp. 684-696 ◽  
Author(s):  
A. Larochelle ◽  
R. F. Black
Keyword(s):  
Field Intensity ◽  
Remanent Magnetization ◽  
High Peak ◽  
Geological Survey ◽  
Design And Testing ◽  
Peak Field

An apparatus used at the Geological Survey of Canada for magnetic cleaning purposes is described. With this apparatus viscous components of remanent magnetization were effectively removed from a group of uniformly magnetized specimens although an appreciable scattering in magnetization directions was observed after treatment at high peak field intensity. Tests were conducted to verify that the scattering was not inherent in the design of the apparatus.

Direct determination of the natural remanent magnetization effect in a hole drilled in layered ground from magnetic field and susceptibility logs

Geophysics ◽  
1992 ◽  
Vol 57 (7) ◽  
pp. 872-884 ◽  
Author(s):  
Guy Desvignes ◽  
Véronique Barthes ◽  
Alain Tabbagh
Keyword(s):  
Magnetic Field ◽  
Remanent Magnetization ◽  
Direct Determination ◽  
Theoretical Models ◽  
Natural Remanent Magnetization ◽  
Case Examples ◽  
Joint Interpretation ◽  
The Fourier Transform ◽  
Layered Ground

A new method as presented, allows the joint interpretation of both electromagnetic (EM) and magnetic logs in layered ground, based on the fact that the susceptibility responses for these two measurements are linear. Thus we can make use of the classical properties of the Fourier transform to extract from these two signals the magnetic field due to remanent magnetization. Theoretical models show that for a sufficient sample step this remanent magnetization can be recovered, even if the Koenigsberger ratio is of the order of 0.2 and if the thickness of the magnetized layer is of the order of 1 m. The results for two case examples in a sedimentary context are also shown. Despite the difficulties due to experimental procedures, we show that the amplitude of the extracted information is significant in these two cases, even if its variations are somewhat structureless and cannot be easily explained by the geology.

Layer selective determination of magnetization vector configurations in an epitaxial double spin valve structure: Si(001)/Cu/Co/Cu/FeNi/Cu/Co/Cu

2000 ◽  
Vol 77 (6) ◽  
pp. 892-894 ◽  
Author(s):  
B. C. Choi ◽  
A. Samad ◽  
C. A. F. Vaz ◽  
J. A. C. Bland ◽  
S. Langridge ◽  
...  
Keyword(s):  
Spin Valve ◽  
Magnetization Vector ◽  
Selective Determination ◽  
Double Spin ◽  
Valve Structure

A METHOD FOR COMPUTING THE TOTAL MAGNETIZATION VECTOR AND THE DIMENSIONS OF A RECTANGULAR BLOCK‐SHAPED BODY FROM MAGNETIC ANOMALIES

Geophysics ◽  
1966 ◽  
Vol 31 (1) ◽  
pp. 74-96 ◽  
Author(s):  
B. K. Bhattacharyya
Keyword(s):  
High Speed ◽  
Magnetization Vector ◽  
The Body ◽  
Total Field ◽  
Unknown Parameters ◽  
Factors Affecting ◽  
Vertical Derivative ◽  
Correct Location ◽  
Unit Of Length

In this paper is presented a new method for determining the following parameters of a uniformly magnetized body of rectangular prismatic shape: (i) horizontal dimensions, (ii) depths to the top and bottom of the body, and (iii) intensity and direction of magnetization. Accuracy in the computation of these parameters is highly dependent on the correct location of the center and on the determination of the major and minor axes of the body. An iterative method of calculations is used. This method is considerably aided not only by the second vertical derivative map of the observed total field but also by the total field reduced to the pole and its second vertical derivative map. The horizontal dimensions are determined by noting the location of the maximum of the odd component of the second vertical derivative about the center of the body. These dimensions are estimated with high accuracy when they are greater than the depth to the top of the body. The remaining unknown parameters of the body are calculated with the help of the first horizontal and vertical derivatives and the total field at the origin in the plane of observation which is directly above the center of the body. The present method also requires the total‐field value at the point one‐half unit of length above the origin. The factors affecting the accuracy in the calculation of the parameters are discussed in detail. With the help of high‐speed digital computers, this method can be used with great advantage for computation of the above parameters of magnetized bodies giving rise to a number of anomalies over a particular area.

Determination of magnetic carriers of the characteristic remanent magnetization of Chinese loess by low-temperature demagnetization

2003 ◽  
Vol 216 (1-2) ◽  
pp. 175-186 ◽  
Author(s):  
Qingsong Liu ◽  
Michael J. Jackson ◽  
Subir K. Banerjee ◽  
Rixiang Zhu ◽  
Yongxin Pan ◽  
...  
Keyword(s):  
Low Temperature ◽  
Remanent Magnetization ◽  
Chinese Loess ◽  
Magnetic Carriers
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