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ferromagnetism
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ferromagnetism
Physical phenomenon in which certain electrically uncharged materials strongly attract others. It is associated with iron, cobalt, nickel, and some alloys or compounds containing these elements. It is caused by the alignment patterns of the material's atoms, each of which acts as a simple electromagnet, due to the motion and spin of the electrons. The tiny magnets spontaneously align themselves in the same direction, so their magnetic fields reinforce each other. Ferromagnetic materials are magnetized easily. Above a temperature called the Curie point, they cease to be magnetic, but they become ferromagnetic again upon cooling below the Curie point. ferrimagnetism.
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A sampling of recording devices. (includes directory)
Magazine article from: Journal of Electronic Defense; 12/1/1992; 700+ words
; ...elevated temperature called the Curie point. In the first step, a laser heats...large portion of one track to the Curie point and effectively erases the track...segments in the coating to the Curie point and thus creating tiny magnetic...
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A sampling of recording devices.
Magazine article from: Journal of Electronic Defense; 1/1/1997; ; 700+ words
; ...elevated temperature called the Curie point. In the first step, a laser heats...large portion of one track to the Curie point and effectively erases the track...segments in the coating to the Curie point and creating tiny magnetic islands...
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Piezoelectric composition has high permittivity and low loss.(ELECTRONICS)
Newspaper article from: Advanced Ceramics Report; 4/1/2006; 320 words
; ...in this material without sacrificing too much in terms of Curie point (the temperature above which a magnetic material losses its...above 1500 (when Qm is high there is low mechanical loss); * Curie point (TC) of 225[degrees]C; * a planar coupling ([k.sub.p]) of...
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Portable Curie point pyrolyzer.(PRODUCT NEWS)
Magazine article from: Laboratory Equipment; 2/1/2006; 91 words
; Booth 1706. Users can easily perform pyrolysis GC/MS analysis using the JCI-21 portable Curie point pyrolyzer. Complicated coupling to a GC has been eliminated. A user simply inserts the pyrolyzed sample with the JCI-21 needle...
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Rubber/polymer analysis. (Literature: instruments).
Magazine article from: Rubber World; 9/22/2002; 46 words
; The AS24 automated Curie Point Pyrolyzer for quantitative, automated pyrolysis/gas chromatography of styrene-butadiene and natural rubber in tires is featured...
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Induction heating frequency and reference depth. (Induction Heating).(Brief Article)
Magazine article from: Industrial Heating; 12/1/2001; 306 words
; ...Frequency as a function of part diameter for heating above the Curie point Optimum diam., mm Economical diam. Frequency, Hz range, mm...Frequency as a function of part diameter for heating below the Curie point Optimum diam., mm Economical diam. Frequency, Hz range, mm...
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Quintiles cited for validation, part 11 deficiencies.(Human drugs)
Newspaper article from: Validation Times; 10/1/2003; 700+ words
; ...check and a temperature check determined by checking the curie point of nickel, the EIR stated. For example, a magnet is placed on the side of the nickel wire and when the curie point of the metal is reached, the magnetism is lost. The weight...
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Quintiles testing facility hit on Part 11, validation.(Human Drugs)
Newspaper article from: Inspection Monitor; 9/1/2003; 700+ words
; ...temperature check. The temperature check is determined by checking the curie point of nickel. For example, a magnet is placed on the side of the Nickel wire and when the curie point of the metal is reached, the magnetism is lost. The weight check...
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Curie-point pyrolysis. (Instruments).
Magazine article from: Rubber World; 12/22/2002; 217 words
; The Pyromat Curie-point pyrolyzer coupled with a GC/MC system...for each sample, if required. The Curie-point pyrolyzer can be installed or removed...the company. The advantage of the Curie-point pyrolyzer is the use of ferromagnetic...
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Analysis of rubber by curie-point-pyrolysis coupled with GC/MS.(Product: instruments)
Magazine article from: Rubber World; 12/22/2004; 204 words
; ...defined for each sample, if required. The Curie-Point-Pyrolyser can be installed or removed...and liquid injection. The advantage of Curie-Point Pyrolysis is said to be the use of ferromagnetic...inside a magnetic field to a defined Curie-Point temperature. With increasing ...
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Related entries from encyclopedias, dictionaries, and thesauruses
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ferromagnetism
Book article from: A Dictionary of Earth Sciences
ferromagnetism In the strict sense, magnetism occurring in substances in which the electron spins are coupled by quantum-mechanical exchange forces...
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ferromagnetism
Book article from: The Columbia Encyclopedia, Sixth Edition
see magnetism .
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ferromagnetic
Book article from: A Dictionary of Earth Sciences
...magnetization which is much greater than either diamagnetism or paramagnetism . There are three types of ferromagnetism: ferromagnetism (in the strict sense); ferrimagnetism ; and antiferromagnetism .
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diamagnetism
Book article from: A Dictionary of Earth Sciences
...opposite direction to that applied. All atoms and molecules show this form of magnetization, usually with a negative susceptibility of the order of 10 −5 or less, but it can have paramagnetism and/or ferromagnetism superimposed upon it.
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magnetism
Book article from: Britannica Concise Encyclopedia
...effects of such fields, and the motion of electric charges . Some types of magnetism are diamagnetism , paramagnetism , ferromagnetism , and ferrimagnetism . Magnetic fields exert forces on moving electric charges . The effects of such forces are evident...
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