Theory of Exchange Resonance in Antiferromagnetic Cu·2O
- 15 April 1962
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 126 (2), 565-572
- https://doi.org/10.1103/physrev.126.565
Abstract
The low crystal symmetry of antiferromagnetic Cu·2O allows an antisymmetric, anisotropic, superexchange interaction (Moriya interaction) of the form ·[×] between corner and base-center copper ions. The classical magnetic-resonance frequencies and spin-wave frequencies have been derived for a four-sublattice model from a spin Hamiltonian consisting of nearest- and next-nearest-neighbor isotropic superexchange interactions, the Moriya interaction, and orthorhombic anisotropy energy. A set of highfrequency exchange modes was obtained in addition to the usual antiferromagnetic resonance modes. The former are characterized by the beating in opposition of ferromagnetic sublattices which would be degenerate in the absence of the Moriya interaction. The exchange frequencies are proportional to the geometric average of the ferromagnetic and antiferromagnetic exchange fields and are an order of magnitude larger than the antiferromagnetic frequencies. A resonance absorption experiment is proposed to detect the exchange modes; zero field magnetic resonance is expected at about 0.7 mm.
Keywords
This publication has 20 references indexed in Scilit:
- Anisotropic Superexchange Interaction and Weak FerromagnetismPhysical Review B, 1960
- New Mechanism of Anisotropic Superexchange InteractionPhysical Review Letters, 1960
- A thermodynamic theory of “weak” ferromagnetism of antiferromagneticsJournal of Physics and Chemistry of Solids, 1958
- Effects of Anisotropy on Thermodynamic Properties of AntiferromagnetsPhysical Review B, 1954
- Theory of Antiferromagnetic Resonance in CuCl2-2H2OProgress of Theoretical Physics, 1954
- Theory of anti-ferromagnetic resonance in a crystal of rhombic symmetry at the absolute zeroPhysica, 1953
- The Spin-Wave Theory of AntiferromagneticsPhysical Review B, 1952
- Anti-ferromagnetism at the absolute zero of temperature in the case of rhombic symmetryPhysica, 1952
- Nuclear magnetic resonance in an anti ferromagnetic single crystal. Part IPhysica, 1952
- On the Antiferromagnetism of CuCl22H2O Single CrystalProgress of Theoretical Physics, 1952