Effect of `hardness´ at the parametric excitation of magnons in antiferromagnetic materials

Author

Kotyuzhanskii, B.Ya. ; Svistov, L.E. ; Benner, H.

Author_Institution

Inst. of Crystallog., Acad. of Sci., Moscow, USSR

Volume

27

Issue

6

fYear

1991

fDate

11/1/1991 12:00:00 AM

Firstpage

5447

Lastpage

5449

Abstract

The parametric excitation of magnons was studied in the easy-plane antiferromagnet MnCO₃ at ω_p/2π=33.8 GHz and T=1.6 K. The experiments were performed for oblique orientation of the magnetic field H with respect to the basal plane σ of the crystal. It was found that the two different microwave threshold fields for the appearance (h_c1) and disappearance (h_c2) of parametric excitation as well as the coefficient of hardness k=(h_c1- h_c2)/h_c1 strongly depend on the angle θ between H and σ, showing a decrease with increasing θ. The experimental results can be explained by the assumption that some part of the magnon relaxation arises from the interaction of magnons with orthogonal magnetic impurities

Keywords

antiferromagnetic properties of substances; magnons; manganese compounds; paramagnetic resonance of iron group ions and impurities; 1.6 K; 33.8 GHz; EPR; MnCO₃; coefficient of hardness; easy-plane antiferromagnet; magnon parametric excitation; magnon relaxation; microwave threshold fields; oblique magnetic field orientation; orthogonal magnetic impurities; Antiferromagnetic materials; Crystalline materials; Crystallography; Ferrimagnetic materials; Frequency; High definition video; Impurities; Magnetic fields; Magnetic hysteresis; Magnetic materials;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.278867

Filename

278867