Skip to main content

demagnetization

demagnetization (cleaning, magnetic) Geologic and archaeological samples are usually partially demagnetized in a series of incremental steps to determine their coercivity and/or blocking-temperature spectra. Viscous remanences are more readily removed than either thermal or chemical remanence, so it is often possible to isolate the original (primary) magnetization acquired when the samples were first formed. This is known as alternating magnetic field demagnetization or thermal ‘cleaning’. Chemical demagnetization can also be used on permeable sedimentary samples in which the cement is usually most readily removed by acid washing, thereby preferentially removing the chemical remanence associated with the cement and isolating the detrital remanence acquired during deposition. Direct magnetic fields can be applied to reduce the observed remanence to zero, this field corresponding to the effective mean coercitivity of the total remanence. New developments include the use of turned microwaves to demagnetize magnetic minerals without much heating and chemical change.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"demagnetization." A Dictionary of Earth Sciences. . Encyclopedia.com. 25 Sep. 2018 <http://www.encyclopedia.com>.

"demagnetization." A Dictionary of Earth Sciences. . Encyclopedia.com. (September 25, 2018). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/demagnetization

"demagnetization." A Dictionary of Earth Sciences. . Retrieved September 25, 2018 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/demagnetization

Learn more about citation styles

Citation styles

Encyclopedia.com gives you the ability to cite reference entries and articles according to common styles from the Modern Language Association (MLA), The Chicago Manual of Style, and the American Psychological Association (APA).

Within the “Cite this article” tool, pick a style to see how all available information looks when formatted according to that style. Then, copy and paste the text into your bibliography or works cited list.

Because each style has its own formatting nuances that evolve over time and not all information is available for every reference entry or article, Encyclopedia.com cannot guarantee each citation it generates. Therefore, it’s best to use Encyclopedia.com citations as a starting point before checking the style against your school or publication’s requirements and the most-recent information available at these sites:

Modern Language Association

http://www.mla.org/style

The Chicago Manual of Style

http://www.chicagomanualofstyle.org/tools_citationguide.html

American Psychological Association

http://apastyle.apa.org/

Notes:
  • Most online reference entries and articles do not have page numbers. Therefore, that information is unavailable for most Encyclopedia.com content. However, the date of retrieval is often important. Refer to each style’s convention regarding the best way to format page numbers and retrieval dates.
  • In addition to the MLA, Chicago, and APA styles, your school, university, publication, or institution may have its own requirements for citations. Therefore, be sure to refer to those guidelines when editing your bibliography or works cited list.