Magnetic Moment

The magnetic moment of a magnet is a quantity that determines the force that the magnet can exert on electric currents and the torque that a magnetic field will exert on it. A loop of electric current, a bar magnet, an electron, a molecule, and a planet all have magnetic moments.

Both the magnetic moment and magnetic field may be considered to be vectors having a magnitude and direction. The direction of the magnetic moment points from the south to north pole of a magnet. The magnetic field produced by a magnet is proportional to its magnetic moment as well. More precisely, the term magnetic moment normally refers to a system's magnetic dipole moment, which produces the first term in the multipole expansion of a general magnetic field. The dipole component of an object's magnetic field is symmetric about the direction of its magnetic dipole moment, and decreases as the inverse cube of the distance from the object.

Read more about Magnetic Moment:  Two Definitions of Moment, Units, Magnetic Moment and Angular Momentum, Magnetic Dipoles

Other articles related to "magnetic moment, magnetic, magnetic moments, moment":

Magnetic Trap (atoms) - Operating Principle
... Many atoms have a magnetic moment their energy shifts in a magnetic field according to the formula ... According to the principles of quantum mechanics the magnetic moment of an atom will be quantized that is, it will take on one of certain discrete values ... If the atom is placed in a strong magnetic field, its magnetic moment will be aligned with the field ...
Examples of Magnetic Moments - Elementary Particles
... and nuclear physics, the symbol μ represents the magnitude of the magnetic moment, often measured in Bohr magnetons or nuclear magnetons, associated ... Values of the intrinsic magnetic moments of some particles are given in the table below Intrinsic magnetic moments and spins of some elementary particles Particle Magnetic dipole ...
... (same proportions of Fe and Ni) - but differ in their electronic structures taenite has a high magnetic moment whereas antitaenite has a low magnetic moment ... established in 1999 and arises from a high-magnetic-moment to low-magnetic-moment transition occurring in the Fe-Ni bi-metallic alloy series ...
Bohr–van Leeuwen Theorem - Proof - A More Formal Proof
... is and velocity is, it produces a current and a magnetic moment The above equation shows that the magnetic moment is a linear function of the position coordinates, so the total magnetic moment in a ... of any function of these generalized coordinates is then In the presence of a magnetic field, where is the magnetic vector potential and is the electric scalar potential ... are related by the equations of Hamiltonian mechanics Therefore, so the moment is a linear function of the momenta ...
Molecule-based Magnets - Theory
... molecule-based magnets stabilize and display a net magnetic moment is quite different than that present in traditional metal- and ceramic-based magnets ... The magnetic moment in molecule-based magnets is typically stabilized by one or more of three main mechanisms Through space or dipolar coupling Exchange between orthogonal (non-overlapping ... Classic magnetic alloys based on iron and other ferromangetic materials feature metallic bonding, with all atoms essentially bonded to all nearest neighbors in the crystal lattice ...

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