Role of Dipole–Dipole Interaction on the Magnetic Dynamics of Anisotropic Layered Cuprate Antiferromagnets

✍ Scribed by M. Sharma; Govind; A. Pratap; Ajay; R.S. Tripathi

• Publisher: John Wiley and Sons
• Year: 2001
• Tongue: English
• Weight: 129 KB
• Volume: 226
• Category: Article
• ISSN: 0370-1972
• DOI: 10.1002/1521-3951(200107)226:1<193::aid-pssb193>3.0.co;2-i

✦ Synopsis

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.