The wire now exhibits a very large magnetic hysteresis : If a magnet is brought near the wire, the high coercivity outer shell excludes the magnetic field from the inner soft core until the magnetic threshold is reached, whereupon the entire wire both the outer shell and inner core rapidly switches magnetisation polarity.
42.
"' International Workshop on 1 & 2 Dimensional Magnetic Measurement and Testing "'( commonly referred to as "'1 & 2DM "'or even "'2DM "')-international meeting devoted to problems in one-and two-directional magnetisation of ferromagnetic materials.
43.
There are 2 issues you may need to address : 1 ) with a soft ferrite of an intial permability of only 9, you may need to prove analytically that magnetisation will be sufficiently even, throughout the magnetisation / demagnetisation cycle . 2 ) The requirement to go in and out of saturation within 50 nS will be difficult to meet.
44.
There are 2 issues you may need to address : 1 ) with a soft ferrite of an intial permability of only 9, you may need to prove analytically that magnetisation will be sufficiently even, throughout the magnetisation / demagnetisation cycle . 2 ) The requirement to go in and out of saturation within 50 nS will be difficult to meet.
45.
The field would then be 5 ?10 8 ?10 " 2 ?( 2 ?4? ?10 " 7 ) = 10 T . Clearly if the magnetisation fixture is not to occupy more room than the puck itself then a very high activation current would be required and either constraint makes in situ magnetization a very difficult proposition.
46.
Finally, and here comes my question, I would expect \ mathbf { M } to depend on the actual \ mathbf { B }, but rather, one writes \ mathbf { M } = \ chi _ \ mathrm { m } \ mathbf { H }, as if the magnetisation isn't affected by what happens in other parts of the object.
47.
Given the fact that an external magnetic field, here generated by driving electric current through the coil, leads to magnetisation of electron spins in the material ( or to reversal of electron spins in an already magnetised ferromagnet & mdash; provided that the direction of the applied electric current is appropriately chosen ), the Einstein de Haas effect demonstrates that spin angular momentum is indeed of the same nature as the angular momentum of rotating bodies as conceived in classical mechanics.
48.
Magnetoelectric materials, in which an electric field induces a magnetisation that is linear in the applied field and vice versa, and the corresponding magnetoelectric effect have a longer history, shown in blue in the graph to the right . ( Note that while magnetoelectric materials are not necessarily multiferroic, all ferromagnetic ferroelectric multiferroics are magneto electric . ) The first known mention of magnetoelectricity is in the 1959 Edition of Landau & Lifshitz "'Electrodynamics of Continuous Media " which has the following comment at the end of the section on piezoelectricity : " Let us point out two more phenomena, which, in principle, could exist.
