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The magnetic field of the Earth aligns the domains, leaving the iron a weak magnet. Drawing of a medical treatment using magnetic brushes. Charles Jacque 1843, France. Magnetism was first discovered in the ancient world when people noticed that lodestones, naturally magnetized pieces of the mineral magnetite, could attract iron. [3]
A magnet's magnetic moment (also called magnetic dipole moment and usually denoted μ) is a vector that characterizes the magnet's overall magnetic properties. For a bar magnet, the direction of the magnetic moment points from the magnet's south pole to its north pole, [ 15 ] and the magnitude relates to how strong and how far apart these poles ...
The elements Dysprosium and Erbium each have two magnetic transitions. They are paramagnetic at room temperature, but become helimagnetic below their respective Néel temperatures, and then become ferromagnetic below their Curie temperatures. The elements Holmium, Terbium, and Thulium display even more complicated magnetic structures. [7]
Magnetic pole model for H and Ampèrian loop model for B yield the identical field outside of a magnet. Inside they are very different. The field of a magnet is the sum of fields from all magnetized volume elements, which consist of small magnetic dipoles on an atomic level.
A magnetic domain is a region within a magnetic material in which the magnetization is in a uniform direction. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction.
In electromagnetism, the magnetic moment or magnetic dipole moment is the combination of strength and orientation of a magnet or other object or system that exerts a magnetic field. The magnetic dipole moment of an object determines the magnitude of torque the object experiences in a given magnetic field. When the same magnetic field is applied ...
The gadolinium ion, Gd 3+, has the f 7 electronic configuration, with all spins parallel. Compounds of the Gd 3+ ion are the most suitable for use as a contrast agent for MRI scans. [30] The magnetic moments of gadolinium compounds are larger than those of any transition metal ion.
A magnetic alloy is a combination of various metals from the periodic table such as ferrite that exhibits magnetic properties such as ferromagnetism.Typically the alloy contains one of the three main magnetic elements (which appear on the Bethe-Slater curve): iron (Fe), nickel (Ni), or cobalt (Co).