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Topic: Remanence

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  A Guide to Understanding Data Remanence in Automated Information Systems (via CobWeb/3.1 planetlab2.isi.jhu.edu)   (Site not responding. Last check: 2007-11-04)
Data remanence is the residual physical representation of data that has been in some way erased.
As early as 1960 the problem caused by the retentive properties of ASI storage media (i.e., data remanence) was recognized.
For discussion purposes, it is better to characterize magnetic remanence as the magnetic representation of residual information that remains on magnetic media after the media has been erased.
www.fas.org.cob-web.org:8888 /irp/nsa/rainbow/tg025-2.htm   (7763 words)

 Enhancing magnetic properties of amorphous alloys by rolling - United States Patent 4,053,332
Whereas the unrolled, unloaded sample possess a remanence in the range of 35% of saturation, the rolled, unloaded sample has a remanence in the range of 2 to 3% of saturation depending on the maximum field applied.
1, the remanence to saturation magnetization ratio is plotted against increasing load for the sample prior to rolling, and for the rolled sample with three different fields impressed thereon.
It may be seen that in all cases, the rolling has substantially reduced the unloaded remanence, but that the impressed magnetic field tends to push the remanence back upwardly toward that of the sample prior to rolling.
xrint.com /patents/us/4053332   (2594 words)

 Data Remanence
While data remanence is not a directly evaluated criterion of trusted computing systems, it is an issue critical to the safeguarding of information used by trusted computing systems.
While data remanence is not a directly evaluated criterion of trusted computing systems, it is an issue critical to the safeguarding of information used by trusted computing systems and, as such, is addressed in this National Computer Security Center (NCSC) guideline.
Coercivlty measured in oersteds (Oe), is a property of magnetic material used as a measure of the amount of applied magnetic field (of opposite polarity) required to reduce magnetic induction to zero from its remanent state, i.e., taking the media from a recorded state to an unrecorded state.
www.crypto-systems.com /datarem.html   (7765 words)

 [No title]   (Site not responding. Last check: 2007-11-04)
At remanence (H=0), the configuration is a 7 domain closure pattern with eight 90 degree walls and two horizontal near 180 degree walls.
At remanence (H=0), the configuration is a 4 domain closure pattern with four 90 degree walls and one horizontal 180 degree wall.
At remanence (H=0), the configuration is a 4 domain closure pattern with 90 degree walls, a 180 degree wall with 2 Bloch lines and a crosstie at the center.
www.ee.umd.edu /~rdgomez/Permalloy.htm   (1165 words)

The remanence of archive halves and oriented discrete samples from working halves was measured using a 2G Enterprises pass-through cryogenic direct-current superconducting quantum-interference-device rock magnetometer (model 760R).
The practical limit on the resolution of natural remanence of core samples is imposed by the magnetization of the core liner itself (~0.01 mA/m).
This indicates that the intensity of the drilling-induced overprint increases radially from the center to the edge of the core, and it suggests that the core barrel is the most significant source of the overprint.
www-odp.tamu.edu /publications/210_IR/chap_02/c2_6.htm   (1447 words)

 Remanence - Wikipedia, the free encyclopedia
Remanence is the magnetization left behind in a medium after an external magnetic field is removed.
The remanence magnitude can be taken from a hysteresis loop at the intersections of the loop with the vertical magnetization axis.
The value of remanence is one of the most important parameters characterising permanent magnets.
en.wikipedia.org /wiki/Remanence   (128 words)

 Method and apparatus for using magneto-acoustic remanence to determine embrittlement - Patent 5121058   (Site not responding. Last check: 2007-11-04)
Magnetic remanence is determined by applying a DC current to the electromagnets, then turning the magnets off and observing the residual magnetic induction.
These remanence test results point to the same conclusion as the MAE results which were previously described, i.e., grain boundaries of embrittled steel are larger obstacles to magnetic domain wall motion than are grain boundaries of unembrittled steel.
As in the magnetic remanence embodiment, in the present embodiment the test component 36' is initially demagnetized using a degaussing procedure to assure there is no net magnetization before starting the test.
www.freepatentsonline.com /5121058.html   (4363 words)

 The Remanent State of Recorded Tapes
Measurements are reported on the in-plane and the perpendicular components of the remanence a tape acquires on passing through the steady field of a recording head.
The perpendicular remanence is not large enough to explain the difference between the in-plane remanence acquired from the head and the remanence acquired in a magnet.
The perpendicular component of the field from the writing head is shown to have two adverse effects on the remanence of the tape.
domino.research.ibm.com /tchjr/journalindex.nsf/0b9bc46ed06cbac1852565e6006fe1a0/8204e5fb638e5f6c85256bfa0067f984?OpenDocument   (210 words)

 High energy product rare earth-iron magnet alloys - Patent 5056585   (Site not responding. Last check: 2007-11-04)
TM herein is used to symbolize a transition metal taken from the group consisting of iron or iron mixed with cobalt, or iron and small amounts of such other metals as nickel, chromium or manganese.
The highest remanence is achieved for neodymium contents of approximately 15 to 13.4 atomic percent.
Table II shows the intrinsic coercivity, magnetic remanence and energy product for neodymium transition metal boron alloys The reported values are for the best overall combination of coercivity remanence and energy product where the aim is to produce a permanent magnet.
www.freepatentsonline.com /5056585.html   (11114 words)

 Navy Remanence Regulation
Remanence refers to traces of information remaining on data storage media after the use of insufficient purging procedures.
Remanence security provides a set of procedures to prevent the unintentional disclosure of information from remanence.
Remanence security provides methods and procedures to prevent disclosure of classified, and/or unclassified but sensitive, information to persons who do not have the proper clearance and need-to-know for that information.
www.fas.org /irp/doddir/navy/5239_26.htm   (6832 words)

 Permanent Magnets
The desirable properties of such magnets are typically stated in terms of the remanence and coercivity of the magnet materials.
Both the coercivity and remanence are quoted in Tesla, the basic unit for magnetic field B.
The materials with high remanence and high coercivity from which permanent magnets are made are sometimes said to be "magnetically hard" to contrast them with the "magnetically soft" materials from which transformer cores and coils for electronics are made.
hyperphysics.phy-astr.gsu.edu /hbase/solids/magperm.html   (571 words)

A related question is whether the larger remanent magnet moment in the (011)-textured films might be due to a fundamental difference in magnetic properties from the (001)-textured films.
The remanence is therefore not likely to be related to unusual exchange coupling but instead to originate from defects, perhaps pinholes through the silicide spacer layer.
Since the remanent magnetization is caused by extrinsic effects, future studies should concentrate instead on measurements of the saturation field of the magnetization curves in order to learn more about the interlayer coupling.
www.wsrcc.com /alison/fesiMMM/node4.html   (495 words)

 A Guide to Understanding Data Remanence in Automated Information Systems
It is important that they be aware of the retentive properties of such media, the known risks in attempting to erase and release it, and the approved security procedures that will help prevent disclosure of sensitive or classified information.
While data remanence is not a directly evaluated criterion of trusted computing systems, it is an issue critical to the safeguarding of information used by trusted computing systems and, as such, is addressed in thA5 National Computer Security Center (NCSC) guideline.
It was known that without the application of data removal procedures, inadvertent disclosure of sensitive information was possible should the storage media be released into an uncontrolled environment.
www.iwar.org.uk /comsec/resources/standards/rainbow/NCSC-TG-025.2.html   (7760 words)

 MagIC Books -- Lectures in Paleomagnetism by Lisa Tauxe -- 2005 -- Lecture 10
The remanence acquired in the laboratory may not have the same proportionality constant as the original remanence (e.g., the sample has altered its capacity to acquire remanence or was acquired by a mechanism difficult to reproduce in the laboratory).
Assuming that the remanence is not chemical but depositional in origin, the intensity of remanence is still a complicated function of applied field, magnetic mineralogy, concentration, and even chemistry of the water column.
The detrital remanence must be an excellent recorder of the geomagnetic field, exhibit no inclination error and if both polarities are present the two populations should be antipodal.
www.earthref.org /MAGIC/books/Tauxe/2005/lecture.10.htm   (4973 words)

 Remanence Properties and Magnetization Reversal Mechanism of Fe Nanowire Arrays
Remanence properties and magnetization reversal mechanism of Fe nanowire arrays with diameters 16 nm and 130 nm are studied.
Isothermal remanent magnetization curves show that the contribution of irreversible magnetization decreases when the diameter changes from 16 nm to 130 nm.
The remanence coercivities of these nanowires obtained in dc-demagnetization curve are about 2400 Oe and 800 Oe, respectively.
stacks.iop.org /0256-307X/21/945   (300 words)

 Publications   (Site not responding. Last check: 2007-11-04)
A further enhancement of the remanence was observed in two-phase α-Fe containing magnets reaching a remanence of J
Remanence enhancement becomes more effective with increasing temperature, compensating the decrease of the saturation polarization.
The decrease of the coercive field with increasing temperature has to be attributed to the temperature dependence of the anisotropy field.
magnet.atp.tuwien.ac.at /publications/jap/suess_2000_87_6573.htm   (203 words)

 Funprox.com article: » Remanence - Apparitions
Remanence, a project of Brain McWilliams and John Phipps, originally started its career under the name Arcana.
“Apparitions”, the debut cd of Remanence, was released by the English Cold Spring label.
The music of Remanence is also very tasteful.
www.funprox.com /index.php/reviews/2002_09/remanence-apparitions   (412 words)

 Remanence Archive - Interview, Spiritual Profit
Almost painfully aware of the disproportion of the excellence of Remanence's music to the attention it receives both world-wide and, more specifically, in the midmost part of Regnvm SerbiƦ (as I prefer to style it) where I live, I took pains to provide it with as much record promotion as circumstances would allow.
Since Remanence is a collaboration between John and I we often have to talk things through to find a meeting point that will satisfy us both musically and intellectually.
Echo Canyon was a track I was considering donating to the pool of Remanence material, and it was one that John had already contributed guitar and keyboard ideas to.
www.mpathrecords.com /press/int_spp.php   (5074 words)

 Ryder Systems Steps Up Drive into French Telco Markets with Appointment of Remanence Conseil : ArriveNet Press Releases ...   (Site not responding. Last check: 2007-11-04)
Remanence Conseil will be instrumental in identifying and developing relationships with key French Telcos, who are keen to reduce customer churn and profit from improved document and bill management solutions.
Remanence Conseil brings vast experience of the Telco sector and an in-depth knowledge of Telecom operators and related partners in France and Europe.
Commenting on the appointment of Remanence Conseil, Mr Tourneux said: “Ryder’s bill management solutions add significant value to the Telcos’ core services, helping them win and retain clients by offering corporate and SME customers the tools to analyse their spend.
press.arrivenet.com /technology/article.php/863884.html   (483 words)

 Data remanence - Wikipedia, the free encyclopedia
After storage media is erased there may be some physical characteristics that allow data to be reconstructed.
Until the old data is overwritten (and this may take months or longer), it can be recovered by programs that read disk sectors directly, such as forensic software (so called because it is used to obtain evidence in criminal investigations and also in legal discovery).
In addition even if a sector is overwritten the phenomenon of data remanence can make deleted data forensically recoverable.
en.wikipedia.org /wiki/Data_remanence   (2331 words)

Néel [1949] developed a theory of remanence in SD particles based on thermal fluctuations.
Remanence in grains with low coercivities are eased first.
Remanence carried by grains with higher coercivities remains unaltered.
www.geo.umn.edu /orgs/irm/hg2m/hg2m_e/hg2m_e.html   (535 words)

 Re: What would the gauss measurement be for magnets made of neodymium material?
The "remanence" of a permanent magnet is the size of the magnetic field, or the "gauss measurement" as you call it, that remains when external fields are turned off.
The exact remanence of any permanent magnet depends very strongly on the composition and the history of the material.
Their remanence is generally in the range of 10,500-14,000 Gauss.
www.madsci.org /posts/archives/may98/893685016.Ph.r.html   (304 words)

 Types of Remanence
A rock carries a natural remanent magnetization (NRM) that is the vector sum of all the different possible components of magnetization acquired over its history.
Isothermal remanent magnetization is the remanence left in the sample after a steady field (1-1000 mT) has been applied for a short time (100 sec) and then switched off.
Anhysteretic remanent magnetization is produced by the combined actions of a large AF and a smaller constant DC field.
www.irm.umn.edu /hg2m/hg2m_f/hg2m_f.html   (897 words)

 Award#0228818 - Collaborative Research: Origin of High Magnetic Remanence in Fault Pseudotachylites
Their remanent magnetic properties are similar to those of lightning struck rocks, which suggests that large electric pulses were involved in the magnetization.
This project aims at demonstrating that remanence anomalies in pseudotachylites are generally observed and that coseismic electric currents are responsible for it.
This problem can be circumvented by using the remanent magnetic record of rocks affected by the electrical phenomenon.
www.science.siu.edu /geology/people/ferre/images/EAR0228818.html   (352 words)

 Method and apparatus for authenticating a record medium consisting of applying two different strength magnetizing ...
The use of different amounts of magnetization will produce different ratios of remanence in a layer having such a watermark but not in an homogenous layer.
A system for examining a record medium expected to include a magnetic material storage layer exhibiting an inherent pattern of magnetic remanence difference between a part of the layer and another part of the layer when both parts are subjected to a uniform magnetising field including
means responsive to the measurements to assess the authenticity status of the medium, the relative remanent magnetisations differing for said different strength magnetising fields for an authentic medium.
www.delphion.com /details?pn10=US04038596   (283 words)

 Ambient CD's available through AtmoWorks.com
A Strange Constellation of Events arrives just in time for the tail end of summer, like an audio postcard describing the deep veil of night and the arc between dusk and dawn.
It's the sound of insects, the trill of frogs, the pulse of fireflies, the night time lighting up in a dazzling array of stars.
This first edition pressing, released on Mpath Records, is identical to the Cold Spring second edition except that the artwork shows band name "Arcana" instead of "Remanence".
www.atmoworks.com /catalog.php?artist=Remanence   (700 words)

 SEDI3-1   (Site not responding. Last check: 2007-11-04)
Documenting the timing of remanence acquisition and stability of magnetization are particularly critical in ancient rocks, which by virtue of their great age are likely to have experienced later thermal/alteration events that may have partially or completely reset the magnetization.
A variety of rock magnetic techniques are available to assess whether the remanence is dominantly carried by fine (single domain) grains that would be capable of preserving a remanence over the long time scales involved.
A prerequisite for the application of this technique is that the remanence is carried predominantly by single domain grains.
mahi.ucsd.edu /cathy/SEDI2002/ABST/SEDI3-1.html   (596 words)

 remanence: apparitions   (Site not responding. Last check: 2007-11-04)
An interest in pairing electronics with parapsychology is evident in the attractive packaging and comes forth in the disc's haunting compositions, which transcend mere musicality by sparse touches of experimentalism.
The droning brass and stirring stringsounds (with buried spoken words) of apparitions lead into the mediavalistic thunder of drums and lilting woodwinds of lovely The Lack of Permanence; sonorous violin strands churn in single and multiple streams, from a more fluid beginning into a waltzing tapestry of sound, backed by booming drumskins.
The moving neo-orchestral arrangements of remanence are morose, but not morbid; these 8.5 tracks would perfectly accent a cold autumn day, a stormy night or your own candlelit quarters.
www.spiderbytes.com /ambientrance/rem-a.htm   (352 words)

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