QMR effect

QMR effect

Quadratic Magnetic Rotation of Polarization of Light is called also QMR or QMR effect.

QMR is a type of magneto-optic effect, discovered in the mid 1980's by a team of Ukrainian physicists. QMR, like the Faraday effect, establishes a relationship between the magnetic field and rotation of polarization of the plane of linearly polarized light. In contrast to Faraday effect QMR states the quadratic proportionality between the angle of the rotation of the plane of polarization and the strength of the magnetic field. Mostly QMR can be observed in the transverse geometry when the vector of the magnetic field strength is perpendicular to the direction of light propagation.

The first evidence of QMR effect was obtained in the antiferromagnetic crystal of cobalt fluoride in 1985.

Considerations of the symmetry of the media, light and axial vector of the magnetic field forbid QMR in non-magnetic or magnetically disordered media. Onsager's reciprocal relations generalized for magnetically ordered media eliminate symmetry restrictions for QMR in the media which have lost the center of anti-inversion as an operation of symmetry at an ordering of its magnetic subsystem. Despite the fact that some crystal groups of symmetry are devoid of the center of anti-inversion, they also don’t have QMR because of action of other operators of symmetry. They are eleven groups without the center of anti-inversion 432, 43'm, m3m, 422, 4mm, 4'2m, 4/mmm, 622, 6mm, 6'm2 and 6/mmm. Accordingly, the rest of groups of crystal symmetry where QMR can be observed constitutes 27 antiferromagnetic and 31 pyromagnetic crystal classes.

QMR is described by fourth-order c-tensor which is antisymmetrical as to the first two indices.

ee also

* Faraday effect
* Magneto-optic effect


* N. F. Kharchenko, A. V. Bibik, V. V. Eremenko. "Quadratic magnetic rotation of polarization plane of light in antiferromagnetic CoF2." JETP Letters, Vol. 42, Issue 11, p. 553 (1985).

Wikimedia Foundation. 2010.

Look at other dictionaries:

  • Faraday effect — In physics, the Faraday effect or Faraday rotation is a magneto optical phenomenon, or an interaction between light and a magnetic field in a dielectric material. The rotation of the plane of polarization is proportional to the intensity of the… …   Wikipedia

  • Magneto-optic effect — A magneto optic effect is any one of a number of phenomena in which an electromagnetic wave propagates through a medium that has been altered by the presence of a quasistatic magnetic field. In such a material, which is also called gyrotropic or… …   Wikipedia

  • List of effects — This is a list of names for observable phenonema that contain the word effect, amplified by reference(s) to their respective fields of study. #*3D audio effect (audio effects)A*Accelerator effect (economics) *Accordion effect (physics) (waves)… …   Wikipedia

  • Lockheed AH-56 Cheyenne — AH 56 Cheyenne AH 56 Cheyenne during testing Role At …   Wikipedia

  • Differential diagnosis — Intervention MeSH D003937 A differential diagnosis (sometimes abbreviated DDx, ddx, DD, D/Dx, or ΔΔ) is a systematic diagnostic method used to identify the presence of an entity where multiple alternatives are …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”