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Grade 9 Academic Science – Unit Physics (Electricity)
Grade 9 Academic Science – Unit Physics (Electricity)

...  Everything is made of atoms…every star, every tree, every animal. Even people are made of atoms. The air and water are, too. Atoms are the building blocks of the universe. They are very, very tiny particles. Millions of atoms would fit on the head of a pin. Protons, Neutrons and Electrons  An ato ...
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... Some solar wind particles, however, do escape the earth’s magnetosphere and contribute to the Van Allen radiation belts. When these particles do enter the magnetic field, they go through three motions: • Spiral- the magnetic field changes the path of the particle. The particle, in its new path, is ...
Electromagnetism Unit 2014
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Physics of Magnetism - University of Oxford
Physics of Magnetism - University of Oxford

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Ferromagnetism



Not to be confused with Ferrimagnetism; for an overview see Magnetism.Ferromagnetism is the basic mechanism by which certain materials (such as iron) form permanent magnets, or are attracted to magnets. In physics, several different types of magnetism are distinguished. Ferromagnetism (including ferrimagnetism) is the strongest type: it is the only one that typically creates forces strong enough to be felt, and is responsible for the common phenomena of magnetism in magnets encountered in everyday life. Substances respond weakly to magnetic fields with three other types of magnetism, paramagnetism, diamagnetism, and antiferromagnetism, but the forces are usually so weak that they can only be detected by sensitive instruments in a laboratory. An everyday example of ferromagnetism is a refrigerator magnet used to hold notes on a refrigerator door. The attraction between a magnet and ferromagnetic material is ""the quality of magnetism first apparent to the ancient world, and to us today"".Permanent magnets (materials that can be magnetized by an external magnetic field and remain magnetized after the external field is removed) are either ferromagnetic or ferrimagnetic, as are other materials that are noticeably attracted to them. Only a few substances are ferromagnetic. The common ones are iron, nickel, cobalt and most of their alloys, some compounds of rare earth metals, and a few naturally-occurring minerals such as lodestone.Ferromagnetism is very important in industry and modern technology, and is the basis for many electrical and electromechanical devices such as electromagnets, electric motors, generators, transformers, and magnetic storage such as tape recorders, and hard disks.
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