Magnetic interactions and magnetization reversal in anisotropic La-Nd-Fe-B/Ta/Co multilayers and disks

•Obvious c-axis texture was achieved in La-Nd-Fe-B/Ta/Co multilayers and disks.•The nucleation and propagation of new domains lead to the irreversible magnetization reversal.•The shape-dependent anisotropy of Co disks enhances the dipolar interaction. Understanding the magnetic interactions and magn...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2019-11, Vol.489 (C), p.165476, Article 165476
Main Authors: Liu, L., Zhao, X.T., Liu, W., Song, Y.H., Chang, Y., Li, S.K., Wei, L.N., Zhao, X.G., Zhang, Z.D.
Format: Article
Language:English
Subjects:
Anisotropy
Arrays
Cobalt
Disks
Domains
Ferrous alloys
Hysteresis loops
Iron
Magnetic fields
Magnetic materials
Magnetic properties
Magnetism
Magnetization reversal
Magnets
Multilayers
Neodymium
Nucleation
Thickness
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Summary:•Obvious c-axis texture was achieved in La-Nd-Fe-B/Ta/Co multilayers and disks.•The nucleation and propagation of new domains lead to the irreversible magnetization reversal.•The shape-dependent anisotropy of Co disks enhances the dipolar interaction. Understanding the magnetic interactions and magnetization reversal behaviors in composite magnets is helpful for exerting the optimum magnetic properties. In this work, we found that the squareness of the hysteresis loop is weakened by increasing the thickness of Ta space-layer in La-Nd-Fe-B/Ta/Co multilayers, but improved by designing the Co layer as periodic arrays of disks. Magnetization reversal behaviors were studied using first order reversal curves (FORC) and magnetic force microscopy (MFM). It has been found that the nucleation and propagation of new domains mainly lead to the irreversible magnetization process. By patterning the Co layer as periodic arrays of disks, the dipolar interaction is enhanced due to the shape-dependent anisotropy of Co disks, leading to better squareness. Our results benefit to understand the magnetic interactions and magnetization reversal behaviors in La-Nd-Fe-B/Co composite systems.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2019.165476