Magnetic reorientation in two-dimensional quantum Heisenberg ferromagnets

Date: 10 September 2019

Venue: UAntwerpen, Campus Groenenborger, G.U. 244 - Groenenborgerlaan 171 - 2020 Antwerpen (route: UAntwerpen, Campus Groenenborger)

Time: 4:00 PM

Organization / co-organization: Condensed Matter Theory

Short description: Condensed Matter Theory lecture presented by Joren Vanherck

Since its experimental discovery in 2017, the field of two-dimensional ferromagnetism has been growing rapidly. Numerous experimental observations are available, but a theoretical understanding is still missing. In this seminar, I present results on the magnetization in two-dimensional ferromagnets with exchange anisotropy in an external magnetic field applied in an arbitrary direction.  Using double-time temperature-dependent Green's functions, we take into account quantum and thermal effects and we show the existence of a magnetic reorientation transition in anisotropic Heisenberg ferromagnets. Additionally, the framework can be extended to fully take into account magnetic dipole-dipole interaction, including its effect on the magnetization direction.

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