Curie temperature


Also found in: Dictionary, Thesaurus, Wikipedia.

Curie temperature

The critical or ordering temperature for a ferromagnetic or a ferrimagnetic material. The Curie temperature Tc is the temperature below which there is a spontaneous magnetization M in the absence of an externally applied magnetic field, and above which the material is paramagnetic. In the disordered state above the Curie temperature, thermal energy overrides any interactions between the local magnetic moments of ions. Below the Curie temperature, these interactions are predominant and cause the local moments to order or align so that there is a net spontaneous magnetization.

In the ferromagnetic case, as temperature T increases from absolute zero, the spontaneous magnetization decreases from M0, its value at T = 0. At first this occurs gradually, then with increasing rapidity until the magnetization disappears at the Curie temperature. In ferrimagnetic materials the course of magnetization with temperature may be more complicated, but the spontaneous magnetization disappears at the Curie temperature.

In antiferromagnetic materials the corresponding ordering temperature is termed the Néel temperature. Below the Néel temperature the magnetic sublattices have a spontaneous magnetization, though the net magnetization of the material is zero. Above the Néel temperature the material is paramagnetic. See Antiferromagnetism

The ordering temperatures for magnetic materials vary widely. The ordering temperature for ferroelectrics is also termed the Curie temperature, below which the material shows a spontaneous electric moment. See Ferromagnetism, Pyroelectricity

Curie temperature

[′kyu̇r·ē ‚tem·prə·chər]
(electromagnetism)
The temperature marking the transition between ferromagnetism and paramagnetism, or between the ferroelectric phase and paraelectric phase. Also known as Curie point.
References in periodicals archive ?
VICALLOY 107 TABLE 47-PHYSICAL AND MECHANICAL PROPERTIES OF VICALLOY 107 TABLE 48-NOMINAL COMPOSITIONS, CURIE TEMPERATURES AND MAGNETIC ORIENTATION OF MAGNET ALLOYS 108 TABLE 49-NOMINAL MAGNETIC PROPERTIES OF MAGNET ALLOYS 108 MAGNET STEELS 109 TABLE 50-NOMINAL COMPOSITIONS, CURIE TEMPERATURES AND MAGNETIC ORIENTATION OF MAGNET STEELS 109 FABRICATION 109 PHYSICAL AND MECHANICAL PROPERTIES 110 MAGNETIC PROPERTIES 110 TABLE 51-NOMINAL MAGNETIC PROPERTIES OF MAGNET STEELS 110 APPLICATIONS 111 PLATINUM COBALT 111 PHYSICAL AND MECHANICAL PROPERTIES 111 TABLE 52-NOMINAL MECHANICAL PROPERTIES OF PT-CO MAGNETS 112 MAGNETIC PROPERTIES 112 TABLE 53-MAGNETIC PROPERTIES OF PT-CO MAGNETS 112 APPLICATIONS 113 MISCELLANEOUS PERMANENT MAGNET MATERIALS 113
The main limitation of the neodymium magnet is that it had a low Curie temperature, as low as 300[degrees]C.
The defect dependence of the Curie temperature in ferroelectric crystals is discussed by some workers [3] considering the change in mass and harmonic force constants between the impurity atoms and the host lattice atoms.
Figure 2 shows that magnetic materials exhibit a large magnetocaloric effect only over a narrow temperature range that is near the Curie temperature ([T.
The early material systems, however, also exhibit lower Curie temperatures compared to PZT, which will affect applications and manufacturing processes.
Laser pulses of 200ns in a 400 oersted bias field is typical for a Curie Temperature of about 200 degrees C.
Also, Curie temperature increases from room temperature at 28% to 950 F for 50% Ni-Fe.
Magnetite is indicated in Figure 1 with a Curie temperature of approximately, 590[degrees] C; that is, the magnetization curve drops rapidly near 590[degrees] C as the magnetic magnetite is rendered nonmagnetic by the thermal agitation.
Tenders are invited for Curie temperature experiment effect set up
Such materials are materials with low Curie temperature.
The model treats the regenerator bed as a one-dimensional matrix of magnetic material with a spatial variation in Curie temperature and, therefore, magnetic properties.
That record can be modified or completely reset if the material is heated above a characteristic temperature known as its Curie temperature.