What Is A Magnetic Domain
Magnetic Domains & Hysteresis
Domains
Nosotros know magnets aren't attracted to everything; if we put a magnet on a wooden wall, information technology will fall right down. By and large, magnets are attracted to objects that are made of the metals iron, nickel, or cobalt. These materials are called ferromagnetic materials. The reason magnets stick to these metals is because of a special feature about the atoms inside these metals. In well-nigh other materials that are not magnetic, the magnetic moments of the atoms inside are all oriented in random directions that cancel each other out. In ferromagnetic materials, the atoms form structures called domains. A domain is a region within of a material where groups of magnetic moments naturally align in the same direction.
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There tin be numerous domains within an object. When there is no external magnetic field present, the domains are also oriented randomly so that there is no cyberspace magnetic field. However, when an external magnetic field is nowadays, the domains will rotate and marshal with the external magnetic field. When all or most of the domains are aligned in the same direction, the whole object becomes magnetized in that direction and becomes a magnet.
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The process of using a magnetic field to magnetize another object is called induction. One time a magnet has been induced, information technology produces its ain magnetic field as long as its domains are aligned.
Hysteresis
Once we accept induced a magnet, we tin can observe an interesting event when the external magnetic field is removed. Depending on the material, the domains will stay lined up together in the same management even later on the external field is gone. The domains exercise non instantly return to normal. This tendency to stay aligned is called hysteresis. Hysteresis is what allows usa to make permanent magnets. To make permanent magnets, we have our material, create any shape we want, then place the material inside of a very stiff magnetic field. The domains inside the textile align with the magnetic field, and when we remove the field, the domains stay aligned, and we at present accept a new magnet. While these are magnets are not truly "permanent", some magnets' domains will not render to their original state for much longer than a single lifetime.
What Is A Magnetic Domain,
Source: https://ece.northeastern.edu/fac-ece/nian/mom/domains.html
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