Pareto-optimal parametric synthesis of axisymmetric magnetic systems with allowance for nonlinear properties of the ferromagnet
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(Hall sensors are placed close to the one of the poles of the permanent magnet and installed in mutually perpendicular directions so that when ferromagnet
is approaching to the magnet, the magnetic field fixed by sensors is changing).
As is usually done for simplicity, we assume [OMEGA] [subset] [R.sup.3] to be bounded with perfectly conducting outer surface [[partial derivative].sub.[OMEGA]] into which the ferromagnet
[omega] [??] [OMEGA] is embedded, and [OMEGA]\[bar.[omega]] is assumed to be vacuum.
Gasparini et al., "Muon spin rotation and relaxation in the superconducting ferromagnet
UCoGe," Physical Review Letters, vol.
Therefore, we proposed the development of electrochemically tunable magnets and demonstrated that the magnetic properties can be controlled by the electrochemical reaction, [Fe.sup.III.sub.4] [[Fe.sup.II][(CN).sub.6].sub.3](ferromagnet
) + 4[K.sup.+] + 4[e.sup.-] [??] + [K.sub.4] [Fe.sup.II.sub.4] [[Fe.sup.II][(CN).sub.6].sub.3] (paramagnet).
Neodymium-iron-boron magnets ([Nd.sub.2][Fe.sub.14]B) contain neodymium from the lanthanide group of elements, as well as iron (a ferromagnet
) and boron.
Ferromagnetic-superconductor hybrid systems are an attractive subject research because of the competition between the spin asymmetry characteristic of a ferromagnet
and the correlations induced by superconductivity [1, 2, 6].
This means the magnetism cannot arise simply from elemental nickel, itself a ferromagnet
. The team found that all three compounds show spontaneous magnetization and a distinctive hysteresis when exposed to a changing external magnetic field--indicative of long-range magnetic ordering, not unlike inorganic magnets.