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Micromagnetic modeling of the shielding properties of nanoscale ferromagnetic layers

Authors :
I. M. Iskandarova
Quentin Stainer
Boris Potapkin
A. F. Popkov
Andrey A. Knizhnik
K. Mackay
Lucien Lombard
Source :
Journal of Applied Physics. 120:123903
Publication Year :
2016
Publisher :
AIP Publishing, 2016.

Abstract

Ferromagnetic shields are widely used to concentrate magnetic fields in a target region of space. Such shields are also used in spintronic nanodevices such as magnetic random access memory and magnetic logic devices. However, the shielding properties of nanostructured shields can differ considerably from those of macroscopic samples. In this work, we investigate the shielding properties of nanostructured NiFe layers around a current line using a finite element micromagnetic model. We find that thin ferromagnetic layers demonstrate saturation of magnetization under an external magnetic field, which reduces the shielding efficiency. Moreover, we show that the shielding properties of nanoscale ferromagnetic layers strongly depend on the uniformity of the layer thickness. Magnetic anisotropy in ultrathin ferromagnetic layers can also influence their shielding efficiency. In addition, we show that domain walls in nanoscale ferromagnetic shields can induce large increases and decreases in the generated magnetic field. Therefore, ferromagnetic shields for spintronic nanodevices require careful design and precise fabrication.

Details

ISSN :
10897550 and 00218979
Volume :
120
Database :
OpenAIRE
Journal :
Journal of Applied Physics
Accession number :
edsair.doi...........e1dafd0df53e9954f6ff05496933324d