scholarly journals Facile decoding of quantitative signatures from magnetic nanowire arrays

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Mohammad Reza Zamani Kouhpanji ◽  
Ali Ghoreyshi ◽  
P. B. Visscher ◽  
Bethanie J. H. Stadler
Keyword(s):  
Nanowire Arrays ◽  
Magnetic Nanowires ◽  
Linear Combinations ◽  
First Order ◽  
Individual Type ◽  
Magnetic Nanowire ◽  
Data Points ◽  
Reversal Field ◽  
The Individual ◽  
Contact Free

Abstract Magnetic nanoparticles have been proposed as contact-free minimal-background nanobarcodes, and yet it has been difficult to rapidly and reliably decode them in an assembly. Here, high aspect ratio nanoparticles, or magnetic nanowires (MNWs), are characterized using first-order reversal curves (FORC) to investigate quantitative decoding. We have synthesized four types of nanowires (differing in diameter) that might be used for barcoding, and identified four possible “signature” functions that might be used to quickly distinguish them. To test this, we have measured the signatures of several combination samples containing two or four different MNW types, and fit them to linear combinations of the individual type signatures to determine the volume ratios of the types. We find that the signature which determines the ratios most accurately involves only the slope of each FORC at its reversal field, which requires only 2–4 data points per FORC curve, reducing the measurement time by a factor of 10 to 50 compared to measuring the full FORC.

ChemInform Abstract: Extracting Individual Properties from Global Behaviour: First-Order Reversal Curve Method Applied to Magnetic Nanowire Arrays

ChemInform ◽  
2013 ◽  
Vol 44 (43) ◽  
pp. no-no
Author(s):  
Fanny Beron ◽  
Louis-Philippe Carignan ◽  
David Menard ◽  
Arthur Yelon
Keyword(s):  
Nanowire Arrays ◽  
First Order ◽  
Global Behaviour ◽  
Magnetic Nanowire ◽  
Curve Method

scholarly journals Interactions and reversal-field memory in complex magnetic nanowire arrays

2011 ◽  
Vol 84 (13) ◽  
Author(s):  
Aurelian Rotaru ◽  
Jin-Hee Lim ◽  
Denny Lenormand ◽  
Andrei Diaconu ◽  
John. B. Wiley ◽  
...  
Keyword(s):  
Nanowire Arrays ◽  
Magnetic Nanowire ◽  
Reversal Field

Self-Organized Magnetic Nanowire Arrays Based on Alumina and Titania Templates

2007 ◽  
Vol 7 (1) ◽  
pp. 272-285 ◽  
Author(s):  
V. M. Prida ◽  
K. R. Pirota ◽  
D. Navas ◽  
A. Asenjo ◽  
M. Hernández-Vélez ◽  
...  
Keyword(s):  
Lattice Parameter ◽  
Magnetic Behaviour ◽  
Nanowire Arrays ◽  
Magnetic Storage ◽  
Magnetic Nanowires ◽  
Self Assembling ◽  
Aspect Ratios ◽  
Magnetic Nanowire ◽  
Ordering Degree ◽  
Ultrahigh Density

Densely packed arrays of magnetic nanowires have been synthesized by electrodeposition filling of nanopores in alumina and titania membranes formed by self-assembling during anodization process. Emphasis is made on the control of the production parameters leading to ordering degree and lattice parameter of the array as well as nanowires diameter and length. Structural, morphological and magnetic properties exhibited by nanowire arrays have been studied for several nanowire compositions, different ordering degree and for different nanowire aspect ratios. The magnetic behaviour of nanowires array is governed by the balance between different energy contributions: shape anisotropy of individual nanowires, the magnetostatic interaction of dipolar origin among nanowires, and magnetocrystalline and magnetoelastic anisotropies induced by the pattern templates. These novel nanocomposites, based on ferromagnetic nanowires embedded in anodic nanoporous templates, are becoming promising candidates for technological applications such as functionalised arrays for magnetic sensing, ultrahigh density magnetic storage media or spin-based electronic devices.

First Order Reversal Curves (FORC) Diagrams of Co Nanowire Arrays

2008 ◽  
Vol 8 (11) ◽  
pp. 5725-5732 ◽  
Author(s):  
M. Ciureanu ◽  
F. Béron ◽  
P. Ciureanu ◽  
R. W. Cochrane ◽  
D. Ménard ◽  
...  
Keyword(s):  
Wire Diameter ◽  
Nanowire Arrays ◽  
Wire Length ◽  
First Order ◽  
Factors Influencing ◽  
Theoretical Predictions ◽  
Nanoporous Alumina Templates ◽  
The Wire ◽  
The Individual ◽  
Array Geometry

Nanowire arrays of Co and Ni have been obtained by current pulse electrodeposition into nanoporous alumina templates. By adjusting the pH of the bath, the microstructure of the Co wires was tailored, resulting in two types of arrays of crystalline Co—hcp, with c-axis nominally parallel (Co (c∥)), or nominally perpendicular (Co (c⊥)) to the wire. First-order reversal curve (FORC) diagrams provide information on average coercivity of the individual nanowire and the factors influencing the field created in the saturated array by the magnetostatic interactions. The dependences of this field on array geometry (wire length and diameter) and saturation magnetization were found to be in excellent agreement with theoretical predictions from a micromagnetic model. For arrays with lower wire diameter, the average coercivity of the individual wires is systematically higher than the coercivity of the array. The most important difference between the two Co series is in the dependence of the FORC diagrams on the wire diameter, with the Co (c⊥) showing significant pattern changes at large diameters. Two possible sources of those changes are discussed.

Novel gradient-diameter magnetic nanowire arrays with unconventional magnetic anisotropy behaviors

2018 ◽  
Vol 54 (54) ◽  
pp. 7515-7518 ◽  
Author(s):  
Jing Wang ◽  
Zhili Zuo ◽  
Liang Huang ◽  
Muhammad Asif Warsi ◽  
John Q. Xiao ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Nanowire Arrays ◽  
Magnetic Nanowires ◽  
Temperature Dependent ◽  
Magnetic Nanowire

Gradient-diameter magnetic nanowires exhibited tailorable magnetic anisotropy that can be used to switch magnetic nanowires easily and unconventional temperature-dependent coercivity.

How to Have Your Quasi-Cake and Quasi-Eat It Too

2021 ◽  
pp. 1-17
Author(s):  
Sebastian Köhler
Keyword(s):  
Research Program ◽  
First Order ◽  
Data Points ◽  
Ethical Project

Abstract Quasi-realism prominently figures in the expressivist research program. However, many complain that it has become increasingly unclear what exactly quasi-realism involves. This paper offers clarification. It argues that we need to distinguish two distinctive views that might be and have been pursued under the label “quasi-realism”: conciliatory expressivism and quasi-realism properly so-called. Of these, only conciliatory expressivism is a genuinely meta-ethical project, while quasi-realism is a first-order normative view. This paper demonstrates the fruitfulness of these clarifications by using them to address Terence Cuneo’s recent challenge that quasi-realist expressivists lack the resources to plausibly accommodate certain sorts of data points.

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