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In its most general form, the magnetoelectric effect (ME) denotes any coupling between the magnetic and the electric properties of a material. [ 1 ] [ 2 ] The first example of such an effect was described by Wilhelm Röntgen in 1888, who found that a dielectric material moving through an electric field would become magnetized. [ 3 ]
The coupling coefficient is a convenient way to specify the relationship between a certain orientation of inductors with arbitrary inductance. Most authors define the range as 0 ≤ k < 1 {\displaystyle 0\leq k<1} , but some [ 28 ] define it as − 1 < k < 1 {\displaystyle -1<k<1\,} .
For first-row transition metals the magnitude of μ eff is, to a first approximation, a simple function of the number of unpaired electrons, the spin-only formula. In general, spin–orbit coupling causes μ eff to deviate from the spin-only formula. For the heavier transition metals, lanthanides and actinides, spin–orbit coupling cannot be ...
The image on the right displays a coordinated heavy metal-oxide complex that can display ferromagnetic or antiferromagnetic behavior depending on the metal ion. The structure shown is referred to as the corundum crystal structure, named after the primary form of Aluminum oxide (Al 2 O 3), which displays the R 3 c trigonal space group.
Coupling may be intentional or unintentional. Unintentional inductive coupling can cause signals from one circuit to be induced into a nearby circuit, this is called cross-talk, and is a form of electromagnetic interference. k is the coupling coefficient, Le1 and Le2 is the leakage inductance, M1 (M2) is the mutual inductance
An example application is separation of aluminum cans from other metals in an eddy current separator. Ferrous metals cling to the magnet, and aluminum (and other non-ferrous conductors) are forced away from the magnet; this can separate a waste stream into ferrous and non-ferrous scrap metal.
There have been reports of large magnetoelectric coupling at room-temperature in type-I multiferroics such as in the "diluted" magnetic perovskite (PbZr 0.53 Ti 0.47 O 3) 0.6 –(PbFe 1/2 Ta 1/2 O 3) 0.4 (PZTFT) in certain Aurivillius phases. Here, strong ME coupling has been observed on a microscopic scale using PFM under magnetic field among ...
Coupling coefficient, or coupling factor, may refer to: Electromechanical coupling coefficient; Coupling coefficient (inductors), or coupling factor, between inductances; Coupling coefficient of resonators; Coupling factor of power dividers and directional couplers; Clebsch–Gordan coefficients of angular momentum coupling in quantum mechanics