Publication

Spin-Nematic Interaction in the Multiferroic Compound Ba2CoGe2O7

Martin Mansson
2014
Journal Articles

Résumé

We demonstrate the existence of the spin-nematic interactions in an easy-plane type antiferromagnet Ba2CoGe2O7 by exploring the magnetic anisotropy and spin dynamics. The combination of neutron scattering and magnetic susceptibility measurements reveals that the origin of the in-plane anisotropy is an antiferro-type interaction of the spin-nematic operator. The relation between the nematic operator and the electric polarization in the ligand symmetry of this compound is presented. The introduction of the spin-nematic interaction is useful to understand the physics of spin and electric dipole in multiferroic compounds.

Source officielle

https://infoscience.epfl.ch/entities/publication/0795ab7c-9abb-4c99-bf88-dc34a4f0a7b5

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Martin Mansson
2014
Journal Articles

Résumé

Source officielle

https://infoscience.epfl.ch/entities/publication/0795ab7c-9abb-4c99-bf88-dc34a4f0a7b5

À propos de ce résultat

Proximité ontologique

Physique

Physique de la matière condensée: Transition de phase

Concepts associés (32)

Magnetocrystalline anisotropy

In physics, a ferromagnetic material is said to have magnetocrystalline anisotropy if it takes more energy to magnetize it in certain directions than in others. These directions are usually related to the principal axes of its crystal lattice. It is a special case of magnetic anisotropy. In other words, the excess energy required to magnetize a specimen in a particular direction over that required to magnetize it along the easy direction is called crystalline anisotropy energy.

Anisotropie magnétique

Une anisotropie magnétique est présente lorsque les propriétés magnétiques d'un système sont orientées selon des axes privilégiés. C'est le cas dans les matériaux ferromagnétiques, où l’aimantation suit des directions privilégiées appelées axes de facile aimantation. Dans les matériaux cristallins, il existe des directions selon lesquelles il est facile d'aimanter le cristal (axes faciles), et des directions de difficile aimantation, on parle d'anisotropie magnéto-cristalline.

Magnetic domain

A magnetic domain is a region within a magnetic material in which the magnetization is in a uniform direction. This means that the individual magnetic moments of the atoms are aligned with one another and they point in the same direction. When cooled below a temperature called the Curie temperature, the magnetization of a piece of ferromagnetic material spontaneously divides into many small regions called magnetic domains. The magnetization within each domain points in a uniform direction, but the magnetization of different domains may point in different directions.

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