### device | magnet:

Alnico magnet
* are made from aluminum, nickel and cobalt.
* can withstand a wide range of temperatures.

Bar magnet
* Most bar magnets have north poles
* are magnets
  - permanent magnets
  - poles at the ends

Dipole magnet
* are able to bend a particle beam.
* work as a lens to focus the electron beam.

### device | magnet:

Electromagnet
* Learn all about electromagnets and how they work.
* Many electromagnets have a cylinder made of soft magnetic material.
* Most electromagnets consist of cores
  - iron cores
  - wire wound around an iron core
* Most electromagnets create fields
  - magnetic fields
  - strong magnetic fields
* Most electromagnets generate fields
  - forces
* Some electromagnets are part of bridges
  - circuits
  - clippers
  - create very strong magnetic fields when current is flowing
* Some electromagnets use batteries
  - materials
* also have north and south poles.
* are a part of our everyday lives
  - another kind of magnet
  - made by coiling a wire around pure iron
  - magnets created from an electric current
  - part of relays
* are temporary magnets - when the current is turned off, the magnetism is gone
  - used for a variety of purposes
* are used in everyday items such as burglar alarms , electric relays and fire bells
  - giant wheels
  - very useful because their magnetism can be turned on and off
* drive electric doorbells, buzzers, and relays.
* follow tradition.
* have poles which can be reversed when the path of electricity is reversed.
* includes sections.
* lose their magnetism when the current is discontinued.
* produce magnetic fields only when electricity travels through their wire coils.
* use an electrical current in order to produce magnetic poles
  - electricity to pick up and release steel or iron objects
+ Magnetism, Electromagnets and Electromagnetism
  * Electromagnets are another kind of magnet. They only work when electricity is running through them. An electric current makes a magnetic field. If you wrap the wire into a coil, the electrons spin around the coil and make a stronger magnetic domain.
  * They are magnets that are only magnetic when there is a coil of wire with electricity running through it. This is called a solenoid. The strength of the magnet is proportional to the current flowing in the circuit. The electricity running through the wire is called a current. The current is the flow of electrons, which are negatively charged particles. Electromagnets are used for a variety of purposes. In a simple example, an electromagnet can pick up pieces of iron, nickel, and cobalt.
  * Electromagnets are used in everyday items such as burglar alarms, electric relays and fire bells. Their ability to change from the state of non-magnetic to magnetic just by passing an electric current through it allows it to be used in many different items.

Ferrite magnet
* are very hard and brittle, and require specialized machining techniques.
* can be wet pressed or dry pressed.
* is substantially a kind of ceramic.

Flexible magnet
* are compounds of plastics or rubbers with magnetic powders.
* can be either isotropic and anisotropic.

Individual atom
* Every individual atom magnet.
* are a few nanometers in diameter
  - tenths of a nanometer
* are too small to be seen
  - see, but packed together they make up familiar chemical elements
* are, however, a different matter.
* can combine with other atoms to form molecules.
* emit and absorb characteristic wavelengths of light.
* serve as qubits with information encoded in the internal atomic state.

Natural magnet
* All natural magnets are bipolar.
* are already magnetic and are found in the Earth
  - known as permanent magnets
  - permanent magnets that never lose their magnetism
* come from a rock called magnetite.
* have north and south poles.