Analysis of Magnetoresistance in Arrays of Connected Nano-Rings

Bordignon, G.; Fischbacher, Thomas; Franchin, Matteo; Zimmermann, Jürgen P.; Zhukov, A. A.; Metlushko, V.; Groot, P.A.J. de; Fangohr, Hans

doi:10.1109/tmag.2007.892597

Cited by 12 publications

(13 citation statements)

References 8 publications

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“…Anisotropic magnetoresistance (AMR) measurements, which lead to changes in the resistivity as the relative orientation between the magnetization ( M ) and current ( I ) is modified, is the ratio given by the electrical resistance increase between resistance states when the magnetization is parallel ( ) and perpendicular ( ) to the current. This property along with the shape of the MR curves have been extensively used to identify micromagnetic configurations, magnetization reversal processes and resistance states in arrays of parallel NWs 35 , 39 , 40 , individual NWs and NTs 41 , 42 , nano-networks 43 , 44 and complex 3-D CNW networks 15 , 16 . In this work, AMR is used to obtain a better insight of the magnetic behavior of 3-D CNT networks and its key difference with 3-D CNW networks.…”

Section: Resultsmentioning

confidence: 99%

Large-scale 3-D interconnected Ni nanotube networks with controlled structural and magnetic properties

Medina

Gomes

Galván

et al. 2018

Sci Rep

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Large-scale, electrically interconnected three-dimensional (3-D) Ni crossed nanotube networks have been fabricated using an electrochemical dealloying method within the crossed nanopores of polymer host membranes. This method paves the way for the easy and cost-effective fabrication of 3-D magnetic NT networks with precise spatial arrangement and diameter and wall thickness of 10–100 nm controlled individually. The excellent control over geometrical parameters and morphological features of the Ni crossed nanotube networks leads to tunable magnetic and magneto-transport properties. Particularly, the low field magneto-transport behavior is consistent with the expected vortex-like states formed in different segments of the nanotube scaffold, whereas nucleation of domain walls at the intersection of the nanowire segments play a dominant role in the solid crossed nanowire networks counterpart. The present 3-D networks of nanomagnets are of special interest due to their potential for memory devices, computing architectures, sensing and biomedical applications.

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Section: Resultsmentioning

confidence: 99%

Large-scale 3-D interconnected Ni nanotube networks with controlled structural and magnetic properties

Medina

Gomes

Galván

et al. 2018

Sci Rep

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“…Simulated DW lengths for the nanostructures featured in Figure 1, are displayed as an inset in Figure 2. For the calculation of the anisotropic magnetoresistance (AMR) plotted in Figure 3b we used nmag (a multiphysics package based on the finite element method developed at Southampton University [13]) and followed the methodology employed by Bordignon et al in Reference [14]. The advantage of using this method is, that it takes into account the back reaction of the AMR effect onto the current distribution hence it provides a more accurate AMR estimation.…”

Section: Methodsmentioning

confidence: 99%

Fabrication and simulation of nanostructures for domain wall magnetoresistance studies on nickel

Claudio-Gonzalez¹,

Husain²,

Groot³

et al. 2010

Journal of Magnetism and Magnetic Materials

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We report the use of electron beam lithography and a bilayer liftoff process to fabricate magnetic Ni nanostructures with constriction widths in the range of 22 to 41 nm. The structures fabricated correspond to the nanobridge geometry. Reproducibility and control over the final nanostructure geometry were observed when using the fabrication process introduced, these two qualities are important in order to carry out a more systematic analysis of domain wall magnetoresistance (DWMR). On the other hand, micromagnetic simulations of structures with the nanobridge geometry were carried out using not only the dimensions of the fabricated nanostructures but also smaller dimensions thought to be achievable with further optimization of the fabrication process. It was found that domain walls with a reduced length of 42.5 nm can be obtained using the nanobridge geometry. Furthermore, the anisotropic magnetoresistance (AMR) effect was calculated numerically and it was found to be smaller than the DWMR, this makes the nanobridge geometry a good candidate for future measurements of the magnetoresistive effect due to domain wall scattering.

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“…The toy system presented in Fig. 2(right) is related to the system studied in [8] features both Dirichlet (fixed potential at top and bottom contacts) and von Neumann (no current leaving the sample through other boundaries) boundary conditions. Conductivity σ(x) depends on the angle θ between current density j and magnetization M: σ(x) = σ 0 /(1+α cos 2 θ).…”

Section: B Anisotropic Magnetoresistancementioning

confidence: 99%

A Systematic Approach to Multiphysics Extensions of Finite-Element-Based Micromagnetic Simulations: Nmag

et al. 2007

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Abstract-Extensions of the basic micromagnetic model that include effects such as spin-current interaction, diffusion of thermal energy or anisotropic magnetoresistance are often studied by performing simulations that use case-specific ad-hoc extensions of widely used software packages such as OOMMF or Magpar.We present the novel software framework 'Nmag' that handles specifications of micromagnetic systems at a sufficiently abstract level to enable users with little programming experience to automatically translate a description of a large class of dynamical multifield equations plus a description of the system's geometry into a working simulation.Conceptually, this is a step towards a higher-level abstract notation for classical multifield multiphysics simulations, similar to the change from assembly language to a higher level humanand-machine-readable formula notation for mathematical terms (FORTRAN) half a century ago.We demonstrate the capability of this approach through two examples, showing (i) a reduced dimensionality model and use of arbitrary order shape functions, and (ii) the computation of a spatial current density distribution for anisotropic magnetoresistance (AMR).For cross-wise validation purposes, we also show how Nmag compares to the OOMMF and Magpar packages on a selected micromagnetic toy system. We furthermore briefly discuss the limitations of our framework and related conceptual questions.

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Analysis of Magnetoresistance in Arrays of Connected Nano-Rings

Cited by 12 publications

References 8 publications

Large-scale 3-D interconnected Ni nanotube networks with controlled structural and magnetic properties

Large-scale 3-D interconnected Ni nanotube networks with controlled structural and magnetic properties

Fabrication and simulation of nanostructures for domain wall magnetoresistance studies on nickel

A Systematic Approach to Multiphysics Extensions of Finite-Element-Based Micromagnetic Simulations: Nmag

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