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Modelling of Magnons: Journey Through Magnetic Moments and Frequencies

Reedy, Hamza (2024) Modelling of Magnons: Journey Through Magnetic Moments and Frequencies. Bachelor's Thesis, Applied Physics.


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Magnons present a promising path for information transfer in emerging areas such as magnonics and spintronics. Thus, modelling magnons through simulating magnetic samples with different parameters is a crucial step in understanding and utilizing them. This thesis delves into the dynamics of magnons and the precessional frequency of magnetic moments across a spectrum of sample shapes, dimensions, exchange stiffness, and magnetic field characteristics. Mumax3 was utilised to run simulations were FEM based on the LLG equation for modelling micro spins in a magnetic sample. Initial simulations uncovered unexpected trends attributed to experimental setups, particularly shape anisotropy and the direction of magnetic fields, which deviated from the Kittel formula's assumptions. Through systematic adjustments of parameters such as exchange stiffness and length, this work identifies critical factors influencing precessional frequency, highlighting the necessity of increasing exchange stiffness for homogeneity. The investigation extends to the simulation of thin films and cubic samples, exploring the impact of magnetic field strength and uniaxial anisotropy on magnonic behavior. Despite encountering methodological and computational limitations, the study achieves results within the theoretical range of the Kittel formula, with an error margin of 10%, from M_s and M_s,fit difference. The study aimed to simulate a magnetic crystal with varying anisotropy constants and found

Item Type: Thesis (Bachelor's Thesis)
Supervisor name: Diniz Guimaraes, M.H. and Bosma, R.
Degree programme: Applied Physics
Thesis type: Bachelor's Thesis
Language: English
Date Deposited: 28 May 2024 08:51
Last Modified: 28 May 2024 08:51

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