Article ID Journal Published Year Pages File Type
11001704 Journal of Magnetism and Magnetic Materials 2019 6 Pages PDF
Abstract
We used the Self-Consistent Harmonic Approximation (SCHA) to study the thermodynamics of the precession magnetization in a two-dimensional isotropic ferromagnet. The SCHA treats the Hamiltonian in terms of the canonically conjugate operators Sz and φ (the azimuth angle) including renormalized temperature dependent parameters to take into account higher order interactions. It is well-known that in right conditions, a dynamic magnetic field is able to provide spin pumping and drives the system to a magnon Bose-Einstein condensation. The magnon condensate is a coherent state that presents minimal uncertainty for the Sz and φ operators. Consequently, 〈Sz〉 and 〈φ〉 should constitute natural fields to describe the model, which justifies the SCHA formalism. The results obtained are consistent with other theoretical and experimental works.
Related Topics
Physical Sciences and Engineering Physics and Astronomy Condensed Matter Physics
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