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These are used to make neodymium magnets. The strength of neodymium magnets is the result of several factors. The most important is that the tetragonal Nd 2 Fe 14 B crystal structure has exceptionally high uniaxial magnetocrystalline anisotropy (H A ≈ 7 T – magnetic field strength H in units of A/m versus magnetic moment in A·m 2).
These temperature dependencies have also been experimentally observed in NiFe 2/5 Cr 8/5 O 4 [8] and Li 1/2 Fe 5/4 Ce 5/4 O 4. [9] A temperature lower than the Curie temperature, but at which the opposing magnetic moments are equal (resulting in a net magnetic moment of zero) is called a magnetization compensation point. This compensation point ...
Assuming the external magnetic field is uniform and shares a common axis with the paramagnet, the extensive parameter characterizing the magnetic state is , the magnetic dipole moment of the system. The fundamental thermodynamic relation describing the system will then be of the form U = U ( S , V , I , N ) {\displaystyle U=U(S,V,I,N)} .
The value of denotes whether the temperature is above, below, or at the Curie temperature (see text). In condensed matter physics , an Arrott plot is a plot of the square of the magnetization M 2 {\displaystyle M^{2}} of a substance, against the ratio of the applied magnetic field to magnetization H / M {\displaystyle H/M} at one (or several ...
B represents the strength and direction of the magnetic field. This equation is strictly only valid for magnets of zero size, but is often a good approximation for not too large magnets. The magnetic force on larger magnets is determined by dividing them into smaller regions having their own m then summing up the forces on each of these regions.
A samarium–cobalt (SmCo) magnet, a type of rare-earth magnet, is a strong permanent magnet made of two basic elements: samarium and cobalt.. They were developed in the early 1960s based on work done by Karl Strnat at Wright-Patterson Air Force Base and Alden Ray at the University of Dayton.
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