Title :
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
fDate :
11/1/1991 12:00:00 AM
Abstract :
The parametric excitation of magnons was studied in the easy-plane antiferromagnet MnCO3 at ωp/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 (hc1) and disappearance (hc2) of parametric excitation as well as the coefficient of hardness k=(hc1- hc2)/hc1 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;
Journal_Title :
Magnetics, IEEE Transactions on
