Jump of tunneling magnetoresistance in magnetic nanocontacts with mismatched cross section

•Jump of tunnel magnetoresistance in size mismatched magnetic contacts.•Peculiarities of the edge local density of states in ultra-nano-sized magnetic contacts.•Tool for precision scanning of nanowire thickness uniformity. We have studied the influence of the transverse size of a magnetic tunnel nan...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2021-10, Vol.536, p.168103, Article 168103
Main Authors: Katkov, V.L., Osipov, V.A.
Format: Article
Language:English
Subjects:
Cross-sections
Electron density
Magnetoresistance
Magnetoresistivity
Nanotechnology devices
Size effects
Spatial distribution
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Summary:•Jump of tunnel magnetoresistance in size mismatched magnetic contacts.•Peculiarities of the edge local density of states in ultra-nano-sized magnetic contacts.•Tool for precision scanning of nanowire thickness uniformity. We have studied the influence of the transverse size of a magnetic tunnel nanojunction on the magnitude of the magnetoresistance. During modeling, the size of the right contact was fixed, while the size of the left one gradually changed until they coincided. We found a sharp drop in the tunneling magnetoresistance (TMR) in nanocontacts with mismatched cross section. This can be explained by the peculiarities of the spatial distribution of the electron density, which is different for majority and minority-spin states. Thus, our study indicates that the quantum size effect can also be a factor affecting the TMR ratio. Taking into account the observed effect can be important when designing the TMR-based nanodevices.
ISSN:0304-8853
1873-4766
DOI:10.1016/j.jmmm.2021.168103