A Method for Characterizing the Microscopic Magnetic Structure of Magnetic Nanomaterials Using Electron Holography
A magnetic nano and electronic holographic technology, which is applied in the direction of material analysis using radiation and the preparation of test samples, etc., can solve the problem of small size of magnetic nanomaterials, low definition of holograms, inability to accurately analyze the microscopic magnetic structure of magnetic nanomaterials, etc. question
Active Publication Date: 2018-07-24
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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[0003] Usually, when electron holography is used to characterize the microscopic magnetic structure of magnetic nanomaterials, the captured holograms are directly aligned. This method has the following difficulties: the magnetic nanomaterials themselves are small in size, and the holograms are distorted due to factors such as instrument limitations. The definition is low, it is difficult to achieve accurate alignment of the hologram, so the electric field signal inside the magnetic nanomaterial cannot be effectively removed, and the microscopic magnetic structure of the magnetic nanomaterial cannot be accurately analyzed
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[0062] As another implementable manner, S200 includes the following steps:
[0063] S210', place the sample on the sample stage of the Lorentz electron microscope, find the easy axis of the sample, apply a magnetic field along the direction of the easy axis, take a hologram corresponding to a certain particle or several particles in the sample, and obtain the first An object hologram; and photographing the hologram corresponding to the blank space in the sample to obtain the first vacuum hologram.
[0064] S220', reversely apply the magnetic field, take another hologram of one or more particles in the sample that is the same as in S210', and obtain the second object hologram; and take a hologram corresponding to the blank in the sample to obtain the second object hologram. Vacuum hologram.
[0065] It should be noted that, in other embodiments, when shooting the first hologram and the second hologram, only the object hologram corresponding to a certain particle or some partic...
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Abstract
The invention discloses a method for characterizing the microscopic magnetic structure of magnetic nanomaterials by using electron holography technology, which comprises the following steps: preparing samples of magnetic nanomaterials required by a Lorentz transmission electron microscope; Observing and photographing the first hologram and the second hologram; respectively reconstructing the first hologram and the second hologram; wherein, the first amplitude map and the first phase map are obtained after the reconstruction of the first hologram; After the second hologram is reconstructed, the second amplitude map and the second phase map are obtained; the first amplitude map and the second amplitude map are aligned, and the operation code during the alignment process is recorded; the first phase map and the second phase map are aligned according to the above operation code The second phase diagram: processing the aligned first phase diagram and the second phase diagram to obtain the microscopic magnetic structure of the magnetic nanomaterial. It realizes the accuracy of hologram alignment, can effectively remove the electric field signal inside the magnetic nanomaterial, and correctly characterize the microscopic magnetic structure of the nanomagnetic material.
Description
technical field [0001] The invention relates to the characterization of the microscopic structure of magnetic nanometer materials, in particular to a method for characterizing the microscopic magnetic structure of magnetic nanomaterials by using electron holography technology. Background technique [0002] Electron holography based on transmission electron microscopy is an important means to measure the microstructure of magnetic nanomaterials, and it is also a research hotspot in recent years. Electron holography technology forms interference fringes through the object wave of the sample and the vacuum reference wave to obtain a hologram, and obtains the microscopic magnetic structure information of the sample by processing the hologram. [0003] Usually, when electron holography is used to characterize the microscopic magnetic structure of magnetic nanomaterials, the captured holograms are directly aligned. This method has the following difficulties: the magnetic nanomater...
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IPC IPC(8): G01N1/28G01N23/04
Inventor 徐显会夏卫星谢林华赵国平杜娟张健闫阿儒刘平
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI