Magnetoelectric Effect


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magnetoelectric effect

[mag¦nēd·ō·i′lek·trik i‚fekt]
(solid-state physics)
A linear coupling between magnetization and polarization found in certain magnetic ferroelectrics, such as BaMnF4 at low temperatures.

Magnetoelectric Effect

 

the appearance of magnetization J in crystals when they are placed in an electric field E (J = aE). The effect is possible only in magnetically ordered crystals (antiferromagnets, ferrimagnets, and ferromagnets).

In 1957, L. D. Landau and E. M. Lifshits first pointed out the possibility of the existence of the magnetoelectric effect. In 1959, on the basis of data concerning the magnetic symmetry of crystals, I. E. Dzialoshinskii predicted in what known antiferromagnets the magnetoelectric effect should be observed. The effect was discovered experimentally by D. N. Astrov in 1960 in the antiferromagnetic crystal Cr2O3. The magnitude of the magnetoelectric effect is small. The maximum value of the coefficient a for Cr2O3 is of the order of 2 ×10-6. The inverse effect also exists—the appearance of electrical polarization P when a crystal is placed in a magnetic field H (P = aH).

REFERENCES

Vonsovskii, S. V. Magnetizm. Moscow, 1971.
Borovik-Romanov, A. S. “Antiferromagnetizm.” In the collection Antiferromagnetizm i ferrity. Moscow, 1962. (Itogi nauki: Fizikomatematicheskie nauki, fasc. 4.)

A. S. BOROVIK-ROMANOV

References in periodicals archive ?
Wu, Magnetization, Magnetoelectric Effect, and Structure Transition in BiFeO3 and (Bi0.95La0.05) FeO3 Multiferroic Ceramics, IEEE Trans.
Chougule, "Effect of resistivity on magnetoelectric effect in (x)NiFe2O4-(1-x)Ba0.9Sr0.1TiO3 ME composites," Journal of Alloys and Compounds, vol.
In case of Gd[Mn.sub.2][O.sub.5], magnetoelectric effect and spin-lattice coupling are commonly acknowledged in several investigations [4,10, 12,14]; little is known about the correlations between structural distortion and lattice dynamics.
When the magnetoelectric effect is produced through strain-coupling, however, the constitutive relations for the materials are no longer strictly ME but now have additional mechanical coupling.
The new scheme will be applied to study two fundamental properties of extended systems: the natural optical activity and the magnetoelectric effect in crystals of technological relevance, such as multiferroics and topological insulators.
Chougule, Electrical Conduction and Magnetoelectric Effect in Ni0.50 Co0.50 Fe2O4 + Ba0.8 Pb0.2TiO3 Composites, Materials Research Bulletin, 39, 2265 (2004).
Eckhard, "Giant magnetoelectric effect in thin-film composites," Journal of the American Ceramic Society, vol.
With multiferroic oxides (in single phase), the coupling interaction among various order parameters causes the so-called magnetoelectric effect [5-10].
The magnetoelectric effects found in magnetic oxides have recently found numerous applications in biology, medicine, and biotechnology [8].
The advantage of a matriciant method is that it equally describes the wave propagation in the presence of one or several physical effects, such as thermoelastic, magnetoelastic, and piezoelastic and magnetoelectric, piezomagnetic, and magnetoelectric effects.
Among the topics are single-phase type-I multiferroics: resolving the seemingly contradictive requirements for ferroelectrity and magnetism, bulk magnetoelectric composites: direct and converse magnetoelectric effects, the Landau theory of multiferroics, first-principle calculations for multiferroic BiFeO3, and topological vortex defects in an improper ferroelectric.