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Magnetix is a magnetic construction toy that combines plastic building pieces containing embedded neodymium magnets, and steel bearing balls that can be connected to form geometric shapes and structures.
Geomag, stylized as GEOMAG, is a magnetic construction toy consisting of a collection of bars, each set with a neodymium alloy magnet at both ends, connected by a magnetic plug coated with polypropylene, and nickel-coated metal spheres. These elements interlock using magnetism, allowing for them to be assembled in various ways.
Magnext is sold as the successor to the discontinued Magnetix series, and retains backward compatibility with the parts. Rather than the rods of Geomag, Magnext has 'triangular' and 'square' pieces with 3 and 4 embedded magnets. The balls are 0.59 inches in diameter (larger than the 0.50 inch balls of Geomag).
For example, 4% electrical steel has an initial relative permeability (at or near 0 T) of 2,000 and a maximum of 38,000 at T = 1 [5] [6] and different range of values at different percent of Si and manufacturing process, and, indeed, the relative permeability of any material at a sufficiently high field strength trends toward 1 (at magnetic ...
In a uniform magnetic field B, the free energy F can be related to the magnetic moment M of the system as = where S is the entropy of the system and T is the temperature. Therefore, the magnetic moment can also be defined in terms of the free energy of a system as m = − ∂ F ∂ B | T . {\displaystyle m=\left.-{\frac {\partial F}{\partial B ...
The vacuum magnetic permeability (variously vacuum permeability, permeability of free space, permeability of vacuum, magnetic constant) is the magnetic permeability in a classical vacuum. It is a physical constant, conventionally written as μ 0 (pronounced "mu nought" or "mu zero").
European combination machines are geared for the serious hobbyist or professional woodworker or cabinet maker. They are constructed of cast iron and heavy gauge steel, weigh from 1,000 to 2,000 pounds (450–910 kg), and range in price from around $5,000 to over $30,000 (2010, U.S. dollars).
In this case the magnetization of the uncoupled electrode remains "free". The TMR becomes infinite if P 1 and P 2 equal 1, i.e. if both electrodes have 100% spin polarization. In this case the magnetic tunnel junction becomes a switch, that switches magnetically between low resistance and infinite resistance.