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Fermi level:- This is the level of energy that lies in the forbiddan gap. It is the level of energy where the concentration of electrons in conduction band is equal to the concentration of holes in valance band.
Since in intrinsic semiconductor the probability of electrons in conduction band is eq ual to the holes in valance band therefore lies exactly in the middle of fforbiddan gap In case of extrinsic semiconductor material, that depends what sort of dopping is there. If the donar impurity is there, it will shift towards conduction band, and if there is acceptor impurity it will shift towards valance band. To understand what a multi ferroic material is and why it is important, it is first necessary to understand what a ferroic material is. A ferroic material is one in which some property can be switched between a number of equivalent states by the application of some external field. Film saint seiya movie 5 sub indo goblin. The best known ex ample of a ferroic material is a ferroamagnet. In these materials the magnetic polarisation can be switched between a number of equivalent stable directions by the application of an external magnetic field. It is easy to show this with a steel nail and a permanent magnet.
The steel is ferromagnetic. Take the north pole of the magnet and stroke it in one direction down the nail towards the point of a 6 inch nail. After doing this, the nail will be magnetised with the south pole at the point. You can demonstrate this by holding it close to a compass needle. The north pole of the compass needle will be attracted towards the point of the nail. If you stroke the north pole of the permanent magnet along the nail in the opposite direction, the point of the nail will now become the north pole, and will attract the south pole of the compass needle. In this way you can demonstrate switching the polarisation of the nail between two opposite, but equivalent states.
The same thing can be done by winding a coil of wire around the nail and passing a current through the coil. Passing the current one way will generate a magnetic field in the nail and polarise it in one direction, so that when the current is removed the nail will stay magnetised.
Reversing the direction of current flow will reverse the nail's direction of magnetisation. This switching between two magnetically poled states is called ferromagnetic hysteresis, and it involves lining up the unpaired electron spins in the material.
Ferromagnetic materials are used all over the place - in transformers, sensors, relay switches, loudspeakers etc. One of the more important modern uses of ferromagnetic materials is in information storage, both as the storage layer in a hard disk and in the read head to read-out the information. One sort of possible information storage mechanism is the spin-valve device, which uses two polarised ferromagnetic conducing layers separated by a very thin insulating layer of oxide (e.g. Electrons can cross the insulating oxide by quantum mechanical tunnelling, but they can do this much easier if the two magnetic layers are polarised in the same direction.
It is much harder to cross the barrier if the conducting layers are oppositely polarised. This is a possible new form of solid state memory. It could be very small. Spin valve devices can also be made with ferromagnetic insulating oxides as the barrier. In this case the direction of polarisation of the magnetic oxide determines how easily the electrons can tunnel through it to magnetic conductors, depending on the relative directions of polarisation. Let's consider now what other sorts of ferroics there are.