coercivity


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Related to coercivity: retentivity

coercivity

[‚kō·ər′siv·əd·ē]
(electromagnetism)
The coercive force of a magnetic material in a hysteresis loop whose maximum induction approximates the saturation induction.

coercivity

On magnetic media, the amount of electrical energy required to change the polarization of a bit. The coercivity of hard disks ranges from 500 to 2,000 Oersted. On magneto-optic media, it takes between 5,000 to 10,000 Oersted. See Oersted.
References in periodicals archive ?
79) reported a 7% increase in coercivity on coating 14 nm cobalt ferrite nanoparticles with a 30-nm layer of polypyrrol.
The geometry and coercivity advantages of perpendicular recording led scientists to believe in potential areal densities that are up to 10 times greater than the maximum possible with longitudinal recording.
The similarity in the directions of the thermally isolated and magnetically isolated vectors further confirmed that single vector nature of the remanence after the removal of a minor viscous component carried by very low coercivity and blocking temperature grains.
4A), mineralogical changes of low and high coercivity fractions take place at 300[degrees]C, possibly due to alteration of pyrrhotite, not identified by microscopical studies.
A world-renowned expert on the physics of magnetic recording, he is particularly well known for his studies of coercivity time-dependence and magnetic stability, summarized briefly by an expression often referred to in the industry as the "Sharrock equation.
The fact that the field-annealed samples reveal a smaller coercivity than the samples annealed without field can thus be understood from more simple domain configuration due to anisotropy induced by external field with intensity large enough to saturate the sample and thus to unify internal magnetic fields (O'Handley, 1999).
However, as the needle-like magnetic particles become smaller, both coercivity (ability to retain magnetic energy) and saturation magnetization (amount of magnetic energy) that are essential for increasing recording capacity and density tend to decrease.
Other encoding options include support for dual high/low coercivity magnetic stripe cards, read/write capabilities for contact and MIFARE contactless smart cards and read-only capabilities for HID proximity cards.
These properties include, among others, the saturation and remanent magnetic moments, and the intrinsic coercivity.
Due to the crystalline anisotropy, the ultra-fine barium-ferrite particles have high coercivity for superior performance high-density recording.
supply PVC cards personalized high coercivity magnetic stripe and ID-1 format for issuing the EHIC.
New ultra-fine ceramic-armored metal particles with high coercivity and superior remanence improving long-term magnetic stability for archival applications.