Effect of 'hardness' at the parametric excitation of magnons in antiferromagnetic materials

The parametric excitation of magnons was studied in the easy-plane antiferromagnet MnCO/sub 3/ at omega /sub p//2 pi =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 sigma of the crystal. It was found that the two d...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1991-11, Vol.27 (6), p.5447-5449
Main Authors: Kotyuzhanskii, B.Y., Svistov, L.E., Benner, H.
Format: Article
Language:English
Subjects:
Antiferromagnetic materials
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Crystalline materials
Crystallography
Exact sciences and technology
Ferrimagnetic materials
Frequency
High definition video
Impurities
Magnetic fields
Magnetic hysteresis
Magnetic materials
Magnetic properties and materials
Magnetically ordered materials: other intrinsic properties
Physics
Spin waves
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Summary:The parametric excitation of magnons was studied in the easy-plane antiferromagnet MnCO/sub 3/ at omega /sub p//2 pi =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 sigma of the crystal. It was found that the two different microwave threshold fields for the appearance (h/sub c1/) and disappearance (h/sub c2/) of parametric excitation as well as the coefficient of hardness k=(h/sub c1/-h/sub c2/)/h/sub c1/ strongly depend on the angle theta between H and sigma , showing a decrease with increasing theta . 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.< >
ISSN:0018-9464
1941-0069
DOI:10.1109/20.278867