Magnetization dynamics of single and trilayer permalloy nanodots

Abstract

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Static and dynamic magnetic properties of circular and square cobalt nanodots in hexagonal cells

“…5a and b for a hexagonal cell of seven nanodots. From this figure we can see that the peak of the 1 s and 1 c resonance modes corresponds to the resonance of the magnetization of all the nanodots that make up the cell and is characterized by a maximum amplitude of precession of the spins associated with the central nanodot 43 (for more details see Fig. S6, ESI †).…”

“…To simulate the magnetic configurations of minimum energy and the hysteresis loops (static magnetic properties), we have used a large value of α = 0.5, generally used to reduce simulation time without affecting the results of the quasi-static simulations. 43 In our simulations, the external magnetic field was applied parallel ( θ = 0°) and perpendicular ( θ = 90°) to the z -axis, separately. A magnitude of H = 1000 mT was used to saturate the samples and field steps of 2 mT were used to investigate the hysteresis curves.…”

Efficient micromagnetic finite element simulations using a perturbed Lagrange multiplier method

“…1. The Gilbert damping parameter of Permalloy is usually assumed to be of amplitude around α = 0.008, but to faster adapt the quasi-static magnetization states, this parameter is considered to be slightly higher as α = 0.5, what is a common assumption in micromagnetic simulations and does not influence the results significantly, compare [23,26]. At the beginning, the nano structure is initiated with an energetically high random distribution of the magnetization vectors (Fig.…”

Низкочастотный Спектр Гиротропных Мод Конечной Цепочки Взаимодействующих Ферромагнитных Нанодисков

“…Действительно, малый размер ферромагнитных объектов (зачастую десятки нанометров), в которых реализуется магнитный вихрь или скирмион, накладывает особые требования к инструментарию [18][19][20][21]. Но полученный в эксперименте спектр коллективных мод способен помочь восстановить информацию о магнитном состоянии отдельного элемента массива.…”