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Topic: Magnetic susceptibility


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In the News (Wed 22 Aug 18)

  
  Magnetic susceptibility - Wikipedia, the free encyclopedia
In electrical engineering, the magnetic susceptibility is the degree of magnetization of a material in response to an applied magnetic field.
In this case, the magnetic field is strengthened by the presence of the material.
The magnetic susceptibility of a ferromagnetic substance is not a scalar.
en.wikipedia.org /wiki/Magnetic_susceptibility   (739 words)

  
 Permeability (electromagnetism) - Wikipedia, the free encyclopedia
In electromagnetism, permeability is the degree of magnetization of a material that responds linearly to an applied magnetic field.
Magnetic permeability is represented by the symbol μ.
If one puts the ferromagnetic material into an externally applied magnetic field, the domains tend to line up, so that the sum of the fields from the ferromagnet and the applied magnetic field is higher in magnitude than the applied magnetic field alone.
en.wikipedia.org /wiki/Permeability_(electromagnetism)   (333 words)

  
 Borehole Geophysics and Petrophysics - Magnetic susceptibility
The magnetic susceptibility (MS) of a volume of rock is a function of the amount of magnetic minerals, (mainly magnetite and pyrrhotite), contained within the rock.
The magnetic susceptibility tool is a Geoinstruments model TH-3C probe which uses a signal processing unit developed at the GSC (Bristow and Bernius, 1984; Bristow, 1985).
As mentioned above in the section on magnetic susceptibility, the secondary field at the receiver coil is measured and the out of phase component is proportional to electrical conductivity (quadrature).
gsc.nrcan.gc.ca /borehole/ms_e.php   (565 words)

  
 Magnetic Susceptibility   (Site not responding. Last check: 2007-10-21)
The magnetic susceptibility can be used for stratigraphic correlations between cores and in the frequency analyses of temporal series to detect sedimentary cycles.
The magnetic susceptibility (k) measures the capability of the material to become magnetized and to produce a noise in the inducing fields.
Paramagnetic mineral are iron and nickel, iron magnetic are the iron oxides (magnetite, hematite, ilmenite, maglemite) hydroxides (limonite, goethite) and sulfurs (pyrite).
doc.bo.ismar.cnr.it /CRUISE_REPORTS/M2001_REP/node24.html   (129 words)

  
 Oxford Archaeotechnics topsoil magnetic susceptibility mapping
The success of magnetic survey in locating areas of archaeological potential is dependent upon a number of factors, and is influenced by geology, the nature of the former activity and subsequent landuse.
The magnetic contrasts often present between buried infilled features or structures and the substrate also create local anomalies in the earth's magnetic field which can be detected by magnetometer survey allowing relatively detailed plots to be made of buried archaeological features.
In some cases the locations of former ploughed-down earthworks are apparent as contrasting (generally magnetically weaker) patterns against the local background, the weaker soil magnetic susceptibility levels reflecting the 'diluting' effect caused by the presence in the topsoil of residual 'clean' material from the core of the former structure.
ds.dial.pipex.com /town/terrace/ld36/magsus.htm   (2268 words)

  
 Source of Magnetic Susceptibility Enhancement in Paleosols---the Roles of Pedogenesis
Magnetic susceptibility of a given paleosol varies across the loess plateau, showing an increase from west to east.
The decrease in magnetic susceptibility even in the loess was interpreted to indicate pedogenic modification of the loess.
Toward the goal of using magnetic susceptibility enhancement to understand better the climate records (e.g., as an indicator of paleoprecipitation), a next step would be to combine the different methods on the same samples.
www.agu.org /revgeophys/reynol00/node3.html   (981 words)

  
 Read about Magnetic susceptibility at WorldVillage Encyclopedia. Research Magnetic susceptibility and learn about ...   (Site not responding. Last check: 2007-10-21)
J is the magnetization of the material (the magnetic dipole moment per unit mass), measured in A/m (i.e.
paramagnetic, and the magnetic field is strengthened by the presence of the material.
diamagnetic and the magnetic field is weakened in the presence of the material.
encyclopedia.worldvillage.com /s/b/Magnetic_susceptibility   (241 words)

  
 Paramagnetism - Wikipedia, the free encyclopedia   (Site not responding. Last check: 2007-10-21)
Paramagnetism is the tendency of the atomic magnetic dipoles to align with an external magnetic field.
The alignment of the atomic dipoles with the magnetic field tends to strengthen it and is described by a relative magnetic permeability greater than unity (or, equivalently, a small positive magnetic susceptibility).
Paramagnetic materials in magnetic fields will act like magnets but when the field is removed, thermal motion will quickly disrupt the magnetic alignment.
www.sciencedaily.com /encyclopedia/paramagnetism   (507 words)

  
 Magnetic Susceptibility   (Site not responding. Last check: 2007-10-21)
The intensity of magnetization, I, is related to the strength of the inducing magnetic field, H, through a constant of proportionality,k, known as the magnetic susceptibility.
The magnetic susceptibility is a unitless constant that is determined by the physical properties of the magnetic material.
In magnetic prospecting, the susceptibility is the fundamental material property whose spatial distribution we are attempting to determine.
www.geo.ucalgary.ca /~maillol/goph365/mag/suscept.html   (118 words)

  
 Geologic High-Resolution Magnetic Tool (GHMT)
In order to obtain a magnetic reversal sequence, the total induction and the susceptibility are processed and combined to reveal the polarity of the remanent magnetization in the sediment.
Magnetic susceptibility is often a good indicator of climatically induced lithological changes.
Magnetic susceptibility measurements on both core and log are reliable and often display correlatable peaks, troughs, and trends.
www.ldeo.columbia.edu /BRG/ODP/LOGGING/TOOLS/ghmt.html   (383 words)

  
 Magnetic Properties of Solids
We recognize this weak magnetic character of common materials by the saying "they are not magnetic", which recognizes their great contrast to the magnetic response of ferromagnetic materials.
In this table the remanent flux density is the retained magnetic field B, and the SI unit for B is the Tesla (T).
The "coercive force" is the applied reverse magnetic field strength H required to force the net magnetic field back to zero after magnetization.
hyperphysics.phy-astr.gsu.edu /hbase/tables/magprop.html   (261 words)

  
 EXAMPLES OF LITHOLOGY LINKED TO MAGNETIC SUSCEPTIBILITY   (Site not responding. Last check: 2007-10-21)
Susceptibility spikes correspond to subintervals 3 and 6.
Magnetic susceptibility provides much information on this score and shows that the connection to oxide gabbros is extremely strong.
The vein bisects a deformed seam of oxide gabbro that was detected as a sharp doublet in magnetic susceptibility, with a peak in excess of 6000
www.ga.gov.au /odp/publications/176_SR/chap_11/c11_6.htm   (2930 words)

  
 Classification  of Magnetic Materials
The two most common types of magnetism are diamagnetism and paramagnetism, which account for the magnetic properties of most of the periodic table of elements at room temperature (see figure 3).
Finally, magnetic materials can also be classified as ferrimagnetic although this is not observed in any pure element but can only be found in compounds, such as the mixed oxides, known as ferrites, from which ferrimagnetism derives its name.
The value of magnetic susceptible falls into a particular range for each type of material and this is shown in table 2 with some examples.
www.aacg.bham.ac.uk /magnetic_materials/type.htm   (1102 words)

  
 Magnetic Susceptibility Balances
Based on their magnetic properties, all substances can be classified into one of three groups, those attracted by a strong magnetic field, known as paramagnetic, those repelled, designated diamagnetic, and, finally, the most recognised class, ferromagnetic, unique in their ability to retain their own magnetic field.
THE MAGNETIC SUSCEPTIBLITY IS DEFINED AS "The ratio of the intensity of magnetism induced in a substance to the magnetising force or intensity of field to which it is subject.
As all substances exhibit magnetic properties it is possible to use magnetic phenomena to identify, differentiate and quantitatively measure components and contaminants in mixtures non destructively.
www.geneq.com /catalog/en/msbalance.html   (644 words)

  
 Magnetic Susceptibility   (Site not responding. Last check: 2007-10-21)
This type of magnetic susceptibility occurs in the middle of the spectrum.
At the lower end of the spectrum we see the magnetic susceptibility artifact between air and tissue, whilst at the other end we see the large signal void and geometric distortion due to metallic implants.
Magnetic susceptibility is used to good effect with superparamagnetic contrast agents and in the investigation of haemorrhage using gradient echo pulse sequence.
mripractice.tripod.com /mrpractice/id29.html   (334 words)

  
 Magnetic Susceptibility Studies   (Site not responding. Last check: 2007-10-21)
Magnetic susceptibilty is a measure of the ability of a material, in this case soil, to become magnetised by an external magnetic field.
When the technique is used in conjunction with measurements of magnetic viscosity (the 'sluggishness' of magnetic particles when they are repeatedly realigned by an external field) it is possible to use the two variables to determine the source of the magnetic properties of the soil sample.
Magnetic susceptibility is therefore both a survey and a diagnostic tool.
www.archaeophysica.co.uk /services/magsus.html   (359 words)

  
 Geophysics - Magnetic Susceptibility
Magnetic susceptibility survey is generally used as a tool for locating concentrations of archaeological settlement i.e.
These features are detectable due to their enhanced magnetic susceptibility, which is acquired through intense burning activity during site occupation, and through the ‘fermentation’ of archaeological deposits remaining in situ.
Where there is sufficient contrast between the magnetic susceptibility of the subsoil and that of the archaeological features these variations can be mapped and used as key indicators for further, more detailed investigation.
www.mglarc.com /services/geophysics/magsus.htm   (171 words)

  
 Integrated Geophysics Corporation - Gravity/Magnetic Glossary
Magnetic basement is usually equated to crystalline (felsic and mafic) or sometimes, metamorphic basement.
A gravity or magnetic structural model is a 2D or 2½D density and/or susceptibility model of given or assumed geology.
For 2-dimensional modeling, the density and susceptibility models of the geology and the observed gravity and magnetic anomalies for the model are assumed to be semi-infinite.
www.igcworld.com /gm_glos.html   (2687 words)

  
 Theory
Because we propose to study the magnetic susceptibility of various materials, it is necessary to include a brief description of magnetic susceptibility.
While many atoms have a permanent non-zero magnetic moment, the net magnetic moment of an assembly of atoms is generally zero due to the random orientation of atoms.
This comes about because inside the magnetic field a current is induced on the surface layer of the superconductor in such a way that its magnetic field cancels the applied field.
mxp.physics.umn.edu /s03/Projects/S03Osc/theory.htm   (1113 words)

  
 Stratascan Ltd - Archaeological survey using Magnetic Susceptibility
The magnetic susceptibility of a material is its ability to become magnetised by an external magnetic field.
The difference between the frequency originally transmitted and that re-emitted is the magnetic susceptibility of the material under the coil.
It is advisable to test magnetically 'quiet' areas with a small section of detailed surveying to ensure archaeological features have not been missed by the magnetic susceptibility survey.
www.stratascan.co.uk /arch-mag-sus.html   (438 words)

  
 Robertson Geologging Limited
This probe relies on a similar principle to the induction probe, whereby a current is induced by an oscillating magnetic field in the probe within a toroidal zone of formation at some radial distance from the probe coils.
The ‘in-phase’ signal is a measure of susceptibility in formations with magnetic properties.
Susceptibility logs are highly sensitive to iron and show large contrasts according to its oxidation state.
www.geologging.com /english/products/probes/magnetic_susceptibility.htm   (175 words)

  
 3.1.2 Periodic Monitoring
Magnetic susceptibility is a measure of the ability of a material to be magnetized.
The basic magnetic object is the magnetic pole, equivalent to the north end of a magnet.
Magnetic poles (a) do not exist as discrete particles, and (b) always appear to come in pairs, and are, therefore, a dipole.
www.cflhd.gov /agm/geoApplications/Quantities/82MagneticSusceptibility.htm   (429 words)

  
 Magnetic properties of materials
Although susceptibility is not directly important to the designer of wound components it is used in most textbooks which explain the theory of magnetism.
Susceptibility is a strong contender for the title of 'most confusing quantity in all science'.
In a bar magnet you may not think that there need be any current but the magnetic field here is also due to moving charge: the electrons circling around the nuclei of the iron atoms or simply spinning about their own axis.
www.ee.surrey.ac.uk /Workshop/advice/coils/mu   (3940 words)

  
 Magnetic susceptibility and low-temperature structure of the linear chain cuprate Sr2CuO3   (Site not responding. Last check: 2007-10-21)
Magnetic susceptibility and low-temperature structure of the linear chain cuprate Sr
High-temperature magnetic susceptibility measurements for the sample with the smallest Curie-Weiss-type term clearly show the increase with temperature expected from the Bonner-Fisher model for a spin-1/2 one-dimensional (1D) Heisenberg antiferromagnet.
Estimates of the interchain magnetic interaction indicate this material may be the best realization of a 1D spin-1/2 Heisenberg antiferromagnet reported to date.
cmp.ameslab.gov /cmp/Abstracts/johnston_16.html   (309 words)

  
 Bartington Instruments - Magnetic Susceptibility System   (Site not responding. Last check: 2007-10-21)
The sensor is used for mass or volume specific susceptibility measurements of standard paleomagnetic samples in studies of rock and mineral magnetism.
This sensor is designed to perform high resolution measurements of magnetic susceptibility along flat surfaces with a roughness of <1mm, particularly for split drill or soft sediment cores with no metal cladding.
This package, for the measurement of the anisotropy of magnetic susceptibility, is used in conjunction with the MS2 meter and MS2B sensor.
www.bartington.com /ms2.htm   (1295 words)

  
 RECOVERING FLOW FABRICS IN DIATEXITE: LOW-FIELD ANISOTROPY OF MAGNETIC SUSCEPTIBILITY (AMS) IN THE NAXOS MIGMATITE ...
Bulk magnetic susceptibilities, measured in low field on 32 diatexite samples (~12 cubes per sample) in the subdome, are generally low (2-100 x 10-6 SI), suggesting the magnetic properties are likely carried by biotite.
Magnetic lineation shows the most systematic variation; it is steeply plunging in the core of the subdome and against the marble bordering the subdome on the west, whereas more intermediate to shallowly plunging magnetic lineations girdle the subdome on the other sides.
The planar and linear magnetic fabric obtained from AMS, and the somewhat systematic spatial variation of these data in the sampled subdome, indicates that AMS is a sensitive indicator of rock fabric in diatexite.
gsa.confex.com /gsa/2005AM/finalprogram/abstract_97473.htm   (498 words)

  
 Heritage Geophysics - Magnetic Susceptibility Meters - SM-30 and SM-100
The SM-100 Portable Magnetic Susceptibility Meter is designed for laboratory or field use to measure bulk susceptibility of standard 25.4 mm cores.
The SM-400 instrument is designed for measuring the magnetic susceptibility in holes with diameters of 40 mm and up to 530 mm deep.
A change in frequency is proportional to the susceptibility of the soil.
www.heritagegeophysics.com /Magnetic_Susceptibility/SM-30_SM-100.htm   (1265 words)

  
 Untitled Document   (Site not responding. Last check: 2007-10-21)
The basis behind the magnetic susceptibility balance is that a paramagnetic sample will be attracted to a magnet and a diamagnetic sample will be slightly repelled.
In the balance used, the sample is fixed in position and the force of the sample on a pair of permanent magnet is measured yielding the measured magnetic susceptibility.
The diamagnetic susceptibility of the bonds need to be added as well for nonsingle bonds unless the system is aromatic and the aromatic values of the atoms are used.
www.chem.vt.edu /chem-dept/brewer/chem-ed/4414/tutorials/magnetism/magnet.html   (998 words)

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