Nickel, iron and cobalt are magnetic metals. Most other metals, including gold, copper, silver and magnesium, are generally not magnetic, although some of these metals might become slightly magnetic if placed in a magnetic field.
Magnets are created by heating a suitable metal enough to exceed the material’s Curie temperature. This aligns the small magnetic fields produced by the material, enabling them to work together. Over time, these individual magnetic fields, called domains, fall out of alignment, causing a magnet to demagnetize. Scientists can also make electromagnets by passing electric currents through coils of wire surrounding a metal object, such as a nail. This principle is used in most engines and turbines and during the production of electricity. Not all magnets are man-made, and some are naturally occurring. For example, the mineral lodestone is magnetic. One of the first magnetic substances discovered, lodestone was used to create early compasses.
The Earth’s magnetic field is produced by the movements of the inner core. Scientists believe that the core is composed primarily of iron and nickel, which are both magnetic. This magnetic field is what causes the needle of a compass to point north. Additionally, the planet’s magnetic field deflects the charged particles that stream from the Sun.Learn More
Magnetic nanoparticles are minute pieces of matter, ranging in size from 1 to 100 nanometers, that are affected by magnetic fields. Magnetic nanoparticles vary depending on how they were synthesized or produced, and they all have different chemical structures. As an example, some metal elements such as cobalt, iron and nickel are made up of magnetic nanoparticles.Full Answer >
Magnetic levitation is a method of supporting an object with the repulsive force of magnets and the stability of servomechanisms. The object is thus suspended in the air, counteracting the effects of gravity.Full Answer >
Each atom of iron has an unpaired electron whose spin can be lined up to that of the unpaired electron from a neighboring iron atom. The spinning of the charged electron creates a magnetic moment, which in turn can align with an external magnet, thus making iron magnetic. Atoms of wood do not have unpaired electron spins that can line up with a magnet, and so it is non-magnetic.Full Answer >
Magnetism occurs when iron is present in metals, so metals can be non-magnetic when they don't contain iron. Although some metals are not magnetic, they still hold the properties of metal and are considered as such.Full Answer >