The exchange interaction refers to the magnetic interaction between electrons within an atom, which is determined by the orientation of each electron's magnetic «spin» — a quantum mechanical property to describe the intrinsic
angular momentum carried by elementary particles, with only two options, either «up» or «down».
Spin is a form of
angular momentum carried by elementary particles.
Not exact matches
To provide some historical context to the work
carried out by Professor Mo Li and his team, consider this: the
angular momentum of light was first measured in the mid-1930s (during the dawn of the quantum theory of light) by Richard Beth of Princeton University and Worcester Polytechnic Institute.
If a skater spinning his partner suddenly lets go, for instance, the partner gets thrown away,
carrying with her most of the
angular momentum.
This twisting characteristic, known as orbital
angular momentum (OAM), has been exploited by researchers in the past, with some showing that it can be used to transmit 2.5 terabits of data per second — the
carrying capacity of more than 66 DVDs — through an optical fibre.
Spin is a particle's intrinsic
angular momentum, and is normally
carried in non-superconducting, non-magnetic materials by individual electrons.
In the supernova explosions that precede the formation of black holes, some of the mass of the star is blown off,
carrying away part of the total
angular momentum of the star.
«Electrons
carry a charge as well as spin -
angular momentum.
Circularly polarized light
carries angular momentum, as if the photons were spinning in space.
This new finding indicates that the jet indeed
carries away part of the
angular momentum (rotational
momentum) from the material in the innermost region of the accretion disk (space hamburger), which is rotating around the central protostar.
The electron does not only
carry a charge, though: It has another important property, spin, which is a quantum mechanical analog of a rotating body's
angular momentum in classical physics.
When stars form from a giant cloud of gas and dust, the
angular momentum of the cloud
carries over to all the objects that form from the cloud, including new planets.
These waves simply
carry off energy and
angular momentum, so the stars get closer and closer, and eventually they touch each other.
Even if we assume that all the mass of the sun is at its surface on the equation (I'm too lazy to
carry out the 3 - dimensional integration over variable density), the solar
angular momentum is 2 * 10 ^ 30 kg x 7 * 10 ^ 8 m * 1 * 10 ^ 3 m / s, or about 1.5 * 10 ^ 41 kg - m ^ 2 / s — about a hundred times less than Jupiter's.
Can the magnetic fields
carried by the plasma of solar wind exert such a torque on the Earth that the Earth
angular momentum is changed significantly?