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Magnetization processes in electrodeposited NiFe/Cu multilayered nanowires

Published online by Cambridge University Press:  27 April 2011

Spyros Krimpalis*
Affiliation:
National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania; and Faculty of Physics, “Alexandru Ioan Cuza” University, 700506 Iasi, Romania
Oana-Georgiana Dragos
Affiliation:
National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania
Anca-Eugenia Moga
Affiliation:
National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania
Nicoleta Lupu
Affiliation:
National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania
Horia Chiriac
Affiliation:
National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania
*
a)Address all correspondence to this author. e-mail: skrimpalis@phys-iasi.ro
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Abstract

The effect of the magnetic anisotropy and the dipolar interactions between NiFe magnetic layers and between nanowires on the magnetic properties of NiFe/Cu multilayered nanowire arrays electrodeposited into the nanopores of anodic aluminium oxide (AAO) templates with diameters of 35 and 200 nm has been studied. The variation of the aspect ratio (thickness/diameter) between the NiFe magnetic and Cu nonmagnetic layers influences the effective anisotropy field. The correlation between the measured hysteresis loops, with the applied field parallel and perpendicular to the multilayered nanowires’ axis, and the calculated effective anisotropy field, Heff, and saturation field, Hsat, shows that it is possible to tune the orientation of the magnetization axis with high accuracy. Two formulas, which include both the intra- and internanowire interactions, were proposed to calculate the saturation fields of multilayered nanowire arrays for the applied field parallel and perpendicular to the nanowires’ axis.

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Copyright
Copyright © Materials Research Society 2011

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