Curie temperature


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Noun1.Curie temperature - the temperature above which a ferromagnetic substance loses its ferromagnetism and becomes paramagnetic
temperature - the degree of hotness or coldness of a body or environment (corresponding to its molecular activity)
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The reference sensor uses a physical fixed point on the basis of the Curie temperature and therefore serves to regularly calibrate the primary sensor.
A ferromagnet, like a standard fridge magnet, acquires its magnetic properties below the magnetic transition temperature (Tc, Curie temperature), when all the magnetic moments are aligned, all "compass needles" point in the same direction.
The first part decreases to zero at [T.sub.C1]~950 K corresponding to the Curie temperature of the [alpha]-[Fe.sub.2][O.sub.3] phase [46] and the second one at [T.sub.C2]~1040 K agrees with the Curie temperature of [alpha]-Fe.
This is offset by the high Curie temperature [T.sub.c]~1223-1248[degrees]C (defined as the transition temperature from ferromagnetism to paramagnetism) making them suitable in areas of spintronic materials, battery cathodes, microwave communication, electric motors, and high-[T.sub.c] superconductors [6-9].
Q-carbon is ferromagnetic with Curie temperature above 500K when pure.
Another interesting finding of the study showed researchers could control and vary the temperature at which CGT lost its magnetism - a property known as Curie temperature.
Most of the time this temperature is determined by the Curie temperature ([T.sub.curie]) in the case of paramagnetic materials whereas it is determined by Neel temperature ([T.sub.N]) for antiferromagnetic materials (AFM).
Stoichiometric MnCoGe displays ferromagnetic (FM) properties below the Curie temperature ([T.sub.C] ~ 345 K).
It also exhibits ferroelectric properties with Curie temperature of 810C [7, 8].
Table 1 quantitatively summarizes the natural magnetic properties of these four types of PMs, where [B.sub.r] is remanence, [H.sub.c] is the coercivity, B[H.sub.max] is the maximum energy product and [T.sub.c] is Curie temperature.
Abolghasem Ataei, the project manager, said the most important issue in such treatment is to properly set the temperature known as Curie temperature where the nanoparticles lose their magnetism and their temperature will not increase.