Theoretical phase stability of incommensurable spin structures on the /001/ surfaces of MnO-type antiferromagnetic semiconductors
A theory for the phase stability of incommensurable spin structures on the /001/ surfaces of the rock-salt--structure antiferromagnetic semiconductors is presented. The theory is based on classical spins and a simple Heisenberg Hamiltonian dependent on three exchange interactions: (a) a surface-only nearest-neighbor exchange; (b) a surface second-layer nearest-neighbor exchange; and (c) an antiferromagnetic second-nearest-neighbor superexchange throughout the crystal. Incommensurable magnetic surface structures are proven to be the ground state for a considerable range of the surface exchange parameters. The properties of the ''frozen'' spin waves used in the variational calculation are fully explored, and the implications for low-energy electron diffraction studies of the rock-salt--structure antiferromagnets are discussed.
- Research Organization:
- Department of Physics, University of California, Berkeley, California 94720
- OSTI ID:
- 6550803
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:5; ISSN PRBMD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360603* -- Materials-- Properties
ANTIFERROMAGNETIC MATERIALS
CHALCOGENIDES
COHERENT SCATTERING
DIFFRACTION
ELECTRON DIFFRACTION
EUROPIUM COMPOUNDS
EUROPIUM TELLURIDES
EXCHANGE INTERACTIONS
HAMILTONIANS
INTERACTIONS
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETIC SEMICONDUCTORS
MAGNONS
MATERIALS
MATHEMATICAL OPERATORS
PHYSICAL PROPERTIES
QUANTUM OPERATORS
QUASI PARTICLES
RARE EARTH COMPOUNDS
SCATTERING
SEMICONDUCTOR MATERIALS
SURFACE PROPERTIES
TELLURIDES
TELLURIUM COMPOUNDS