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球形钴纳米颗粒中的多域结构。

Multi-domain structures in spheroidal Co nanoparticles.

作者信息

Usov N A, Nesmeyanov M S

机构信息

National University of Science and Technology «MISiS», 119049, Moscow, Russia.

Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Sciences, (IZMIRAN), 108840, Troitsk, Moscow, Russia.

出版信息

Sci Rep. 2020 Jun 23;10(1):10173. doi: 10.1038/s41598-020-67173-5.

DOI:10.1038/s41598-020-67173-5
PMID:32576958
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7311469/
Abstract

The structure of multi-domain micromagnetic states in hcp cobalt nanoparticles of spheroidal shape has been studied using numerical simulation in the range of diameters 20-200 nm. The single-domain diameters of the particles are determined depending on their aspect ratio. The complicated vortex structure of domain walls for two- and three-domain micromagnetic configurations is investigated. It has been shown that three domain states are actually strongly deformed two vortex states. In hcp cobalt particles of sufficiently large sizes two types of three-domain micromagnetic states with close total energies have been obtained. They differ in different magnetization directions of the exchange cores of the vortex domain walls. The remanent magnetization of particles has been calculated for two- and three-domain micromagnetic states. The single-domain diameters of fcc cobalt nanoparticles with cubic type of magnetic anisotropy were also calculated.

摘要

利用数值模拟研究了直径在20 - 200nm范围内的球状六方钴纳米颗粒中多畴微磁状态的结构。根据颗粒的纵横比确定了颗粒的单畴直径。研究了两畴和三畴微磁构型的畴壁复杂涡旋结构。结果表明，三畴状态实际上是强烈变形的两个涡旋状态。在足够大尺寸的六方钴颗粒中，获得了两种总能量相近的三畴微磁状态。它们在涡旋畴壁交换核的不同磁化方向上有所不同。计算了两畴和三畴微磁状态下颗粒的剩余磁化强度。还计算了具有立方磁各向异性的面心立方钴纳米颗粒的单畴直径。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/95cafe6f3b34/41598_2020_67173_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/068492b53b21/41598_2020_67173_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/be64625add88/41598_2020_67173_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/f045ca7a0702/41598_2020_67173_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/7bf99d9119b0/41598_2020_67173_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/e471ef12aa08/41598_2020_67173_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/95cafe6f3b34/41598_2020_67173_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/068492b53b21/41598_2020_67173_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/be64625add88/41598_2020_67173_Fig2_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/f045ca7a0702/41598_2020_67173_Fig3_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/7bf99d9119b0/41598_2020_67173_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/e471ef12aa08/41598_2020_67173_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/ad91/7311469/95cafe6f3b34/41598_2020_67173_Fig6_HTML.jpg

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[1]
Multi-domain structures in spheroidal Co nanoparticles.

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[5]
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[6]
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[7]
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[8]
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[9]
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[10]
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Materials (Basel). 2023-10-14

[2]
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Sci Rep. 2023-9-14

[3]
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Materials (Basel). 2023-5-11

[4]
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[6]
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