The fundamental possibility of measuring the stray fields distributions of magnetic objects in a scanning electron microscope is demonstrated. The main idea of the method is to use a sample holder for operation in the mode of a scanning transmission microscope, additionally equipped with a square diffraction grating. This grating, formed on the basis of a metal film, is placed at some distance under the magnetic sample. Reconstruction of the deflections of transmitted electrons by analyzing the geometric phase from visible distortions of the diffraction grating made it possible to reconstruct the distribution of the magnetic field created by the sample under study.
We present the results of micromagnetic modeling and experimental magnetic resonance force spectroscopy studies of forced magnetization oscillations in a circle NiFe disk in an external longitudinal magnetic field. The main attention is paid to the low-frequency resonance associated with the gyrotropic motion of the magnetic vortex core. It is shown that the applying external magnetic field in the plane of the sample leads to a significant shift in the resonance frequency of the gyrotropic mode. The influence of the inhomogeneous magnetic field of the probe on the peculiarities of the magnetization oscillations is discussed.
The results of micromagnetic modeling of the gyrotropic mode of magnetization auto-oscillations in overlapping ferromagnetic disks under the action of a spin-polarized current are presented. It is shown that the exchange interaction between disks significantly increases the binding energy of magnetic vortices and, as a consequence, reduces the dephasing of the vortex core gyration in neighboring disks.
Приводятся результаты исследования низкочастотного ферромагнитного резонанса в системе двух перекрывающихся пермаллоевых дисков методом магнитно-резонансной силовой спектроскопии. Показано, что резонансная частота гиротропной моды колебаний магнитных вихрей в данной системе существенно зависит от направления завихренности их оболочек. Экспериментальные зависимости резонансных частот различных состояний от внешнего магнитного поля качественно согласуются с результатами микромагнитного моделирования. Ключевые слова: ферромагнитный резонанс, магнито-резонансная силовая спектроскопия, магнитные вихри.
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