Unit:
Κατεύθυνση Φυσική των Υλικών (ΒΑΣΙΚΗ ΦΥΣΙΚΗ)Library of the School of Science
Author:
Kordos Konstantinos
Supervisors info:
Ν. Στεφάνου (Καθηγητής, ΕΚΠΑ - Τμήμα Φυσικής)
Ν. Παπανικολάου (Ερευνητής Α' ΕΚΕΦΕ <<Δημόκριτος>>)
Σ. Γλένης (Επίκουρος Καθηγητής, ΕΚΠΑ - Τμήμα Φυσικής)
Original Title:
Υπολογισμός της μαγνονικής δομής ζωνών περιδικά δομημένων μαγνητικών υλικών με τη μέθοδο των επιπέδων κυμάτων
Translated title:
Calculation of the magnonic band structure of periodically structured magnetic materials by the plane wave method
Summary:
In this thesis we study the dispersion relations for the propagation of spin waves in two - dimensional periodic structures of magnetic materials by solving the linearized Landau – Lifshitz equation of motion of the magnetization for an effective field caused by dipolar and exchange interactions. We provide an overview of the necessary ingredients to describe the propagation of spin waves and discuss the solution of the Landau – Lifshitz equation for magnetostatic spin waves. We consider two different periodic structures of cylinders embedded in a magnetic material and the magnetic dynamics are studied using a plane wave method. By expanding the spatial variation of the magnetization and the material properties into plane waves, the equation of motion is transformed into an algebraic system of equations and the magnetization is deduced from the solution of an eigenvalue problem
Main subject category:
Science
Keywords:
Spin waves, magnonic crystals, band structure, plane wave method
