The influence of Gaussian magnetic pulse on magnetization dynamic in permalloy thin films

Spintronic device development relies on an understanding of magnetization dynamics in permalloy thin films, as it reveals the material's properties and magnetization reversal mechanism through the propagation of the domain wall controlled by the external magnetic field pulse. This study explores the impact of Gaussian magnetic pulse width and height on magnetization rate in permalloy thin films using micromagnetic simulations based on the Landau-Lifshitz-Gilbert (LLG) equation. The examined Gaussian magnetic pulse heights were 200 mT and 500 mT, respectively, and the corresponding pulse width varied from 200 to 2000 ps. The size of the permalloy thin film also varied. After exposure to a Gaussian magnetic pulse, the magnetic moments become magnetized and oscillate. Oscillation or ringing can result from the interaction between the magnetic pulse and spin and is impacted by a low damping value. The magnetization reversal rate will reach a constant value at each critical pulse width. The amplitude of the magnetic field and thin film sizes influence the critical pulse width. The primary component influencing the permalloy thin film magnetic energy during the magnetization reversal is demagnetization energy, which leads to the onset of a single domain. The study suggests that spintronic devices can modify read-write data on the permalloy thin film using either a high-intensity magnetic field with a short pulse duration or a low-intensity magnetic field with a longer pulse duration. Nonetheless, it is essential to take into account the size of the thin layer to enhance the efficiency of spintronic devices.