Modeling Stray Field Distribution Generated by Domain Walls in Rare-Earth Substituted Iron Garnets

Rare-earth substituted iron garnets (REIGs) are interesting materials which may present large in-plane magnetization. In correspondence of defects, domain walls (DWs) undergo nucleation, segmentation, and pinning. In such cases, the Néel spike domain structure may appear, and its DWs can produce not...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2022-02, Vol.58 (2), p.1-5
Main Authors: Napolitano, A., Ragusa, C., Laviano, F.
Format: Article
Language:English
Subjects:
Domain walls
FEM simulation
Garnets
Image segmentation
Iron
magento-optical imaging
Magnetic anisotropy
Magnetic domains
Magnetic resonance imaging
Magnetism
Magnetization
Microcracks
Microstructure
Nucleation
Perpendicular magnetic anisotropy
Quantitative analysis
Rare earth elements
rare-earth substituted iron garnets (REIGs) characterization
Solid modeling
stray field evaluation
Substitutes
Three dimensional models
Three-dimensional displays
Two dimensional models
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Summary:Rare-earth substituted iron garnets (REIGs) are interesting materials which may present large in-plane magnetization. In correspondence of defects, domain walls (DWs) undergo nucleation, segmentation, and pinning. In such cases, the Néel spike domain structure may appear, and its DWs can produce not negligible stray fields above the REIG. Experimental characterization through quantitative magneto-optical imaging with an indicator film showed that stray fields are detectable above the surface of Lu and Bi substituted iron garnets in correspondence of DWs delimiting a Néel spike that is generated by a microcrack. These DWs are interesting for both fundamental studies and innovative applications, and therefore carrying out a quantitative analysis is crucial. To understand how the externally detected stray fields are correlated with the pattern of the internal magnetization, here we propose 2-D and 3-D models based on FEM developed through the COMSOL Multiphysics software. These models consider the in-plane magnetization of the REIG and the magnetic microstructure of the Néel spike. They provide a good reproduction of the magnetic fields and allow describing the corresponding magnetic microstructure. It turns out that the results are both in agreement with the experiments.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2021.3083589