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Role of Dipole–Dipole Interaction on the Magnetic Dynamics of Anisotropic Layered Cuprate Antiferromagnets
Author(s) -
Sharma M.,
Pratap A.,
Tripathi R.S.
Publication year - 2001
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200107)226:1<193::aid-pssb193>3.0.co;2-i
Subject(s) - condensed matter physics , dipole , hamiltonian (control theory) , physics , magnetization , anisotropy , magnetic dipole , exchange interaction , magnetic anisotropy , spin wave , magnetization dynamics , heisenberg model , magnetic dipole–dipole interaction , magnetic field , quantum mechanics , antiferromagnetism , ferromagnetism , mathematical optimization , mathematics
In the present paper, we report the role of dipole–dipole interaction on the magnetic dynamics of single layer antiferromagnets. For this, the model Hamiltonian includes the exchange Heisenberg Hamiltonian as well as dipole–dipole interactions. Within the linear spin‐wave theory, we employ the double time Green's function technique to obtain expressions for the spin wave dispersion, sublattice magnetization and the magnetic contribution to specific heat as a function of various parameters of the model Hamiltonian. We observe through numerical calculations that in the absence of anisotropy in exchange couplings the dipole–dipole interaction works as an anisotropy and sustains the magnetization even in a pure 2D system.