The interaction field in arrays of ferromagnetic barcode nanowires

Abstract

The interaction field in arrays of ferromagnetic barcode nanowires Clime, L.; Zhao, S. Y.; Chen, P.; Normandin, F.; Roberge, H.; Veres, T.Contact us / Contactez nous: nparc.cisti@nrc-cnrc.gc.ca. AbstractA theoretical model and an experimental approach to the identification of the interaction field in ferromagnetic barcode nanowires are described and applied to electrodeposited Ni/Au cylindrical barcode arrays. Elementary hysteresis loops of individual magnetic segments in these barcode nanowires are considered as superpositions of fully irreversible and locally reversible magnetization processes, whose distributions of switching fields are experimentally identified by first order reversal curve measurements. Non-interacting major hysteresis loops of the arrays are computed as superpositions of several elementary loops by considering the distributions of switching fields as probability density functions. The interaction field is then computed from the condition that the geometric transformation of the experimental major hysteresis loop into the Preisach operative plane be well approximated by this non-interacting hysteresis loop. Experimental interaction field values are compared with those obtained by numerical micromagnetic computations and a very good agreement is obtained on extended Ni/Au barcode arrays. The simple and accurate phenomenological model for the interaction field in multisegmented ferromagnetic nanowire arrays proposed here provides an insight into the morphology of these magnetic nanomaterials, as quantitative information about individual nano-objects may be extracted from macroscopic measurements of their arrays.

Improving information storage by means of segmented magnetic nanowires

“…In some studies contributions are added in one way up to an arbitrary prefixed distance and in a different approximate way for more distant objects [18]. In the present treatment not such arbitrary separation is done and all pair contributions to the energy are added on the same footing.…”

Large-scale synthesis of Au–Ni alloy nanowires using electrochemical deposition

“…Particularly different research groups show considerable interest in the fabrication and characterization of nanostructured ferromagnetic nanowire arrays due to their potential applications in magnetic recording media and sensors (Fert and Piraux 1999;Albrecht et al 2000;McGary et al 2006;Clime et al 2007), synthesis of carriers for magnetic manipulation in bio-medical applications (Reich et al 2003;Link and ElSayed 1999;Nicewarner et al 2003;Mock et al 2002) or magnetic nano-assembly (Xu et al 2005;Bicelli et al 2008). Because of the possibility of favorable tailoring of their intrinsic and geometric anisotropies (Dahmane et al 2006;Huang et al 2002;Shamila et al 2008;Cho et al 2006; Kumar et al 2006), these nanowires are more advantageous over classical superparamagnetic particles.…”

“…Because of the possibility of favorable tailoring of their intrinsic and geometric anisotropies (Dahmane et al 2006;Huang et al 2002;Shamila et al 2008;Cho et al 2006; Kumar et al 2006), these nanowires are more advantageous over classical superparamagnetic particles. In these days, magnetic multilayered nanowires are potential contenders for high density magnetic data storage, magnetic sensors, and spintronic applications (Fert and Piraux 1999;Albrecht et al 2000;McGary et al 2006;Clime et al 2007). Utilizing the interface phenomena from periodic layering of non-magnetic and magnetic materials with suitable layer thicknesses in multilayered nanowires, giant magnetoresistance (GMR) property can be observed.…”

Energy and force between two magnetic nanotubes

“…Therefore, the Fe nanotubes are a promising ferromagnetic material to make durable data storage devices operating in rough environment [7]. An interesting application for magnetic nanotubes is the possibility of fabricating them in multisegmented form [8] and then use this product for barcode designs as it has already been demonstrated for ferromagnetic nanowires [9].…”