Tuning magnetic fingerprints of FeNi nanowire arrays by varying length and diameter

Ramazani, A.; Asgari, V.; Montazer, A.H.; Kashi, M. Almasi

doi:10.1016/j.cap.2015.04.023

Cited by 45 publications

(23 citation statements)

References 56 publications

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“…The P Hr peak indicates the average coercivity of the sample, similar to P Hc distributions, as it is related to the derivative of the upper branch of the hysteresis loop [56]. These results are similar to the demonstration of AC susceptibility plots in [35] where two magnetic phases could be more easily visualized that in standard FORC heat-maps. For most of the combined samples, the P Hr plots show a clear mixture of single component features, according to the volume ratio of the samples in the combination.…”

Section: Resultssupporting

confidence: 76%

“…The electrolyte consisted of 0.4 M boric acid, 1 mM malonic acid, 0.3 M ammonium chloride, 0.3 mM sodium dodecyl sulfate, 6 mM ascorbic acid, 0.2 M iron sulfate, and 0.1 M cobalt sulfate at pH 3. The concentration ratio of the iron sulfate to cobalt sulfate was chosen 2:1 in order to achieve a Fe to Co atomic ratio of 2:1, ∼Fe 65 Co 35 . This composition is known to have the highest saturation magnetization [49] so it enables measurements of even very small numbers of MNWs.…”

Section: Experimental and Statistical Approachesmentioning

confidence: 99%

“…Traditionally, the quantitative analysis of the FORC data is done using the projection of FORC distribution on the H c -axis and H u -axis, called coercivity distribution (P Hc ) and interaction distribution (P Hu ), respectively, see figure 1(a). Here, quantitative analysis means quantifying the coercivity and the interaction fields, not quantifying the amount of the magnetic components [26,35]. Intuitively, the definition of the coercivity and interaction fields is not appropriate for quantifying the amount of each magnetic subcomponent present in a sample.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Beyond the qualitative description of complex magnetic nanoparticle arrays using FORC measurement

Kouhpanji

Stadler

2020

Nano Ex.

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First-order reversal curve (FORC) measurements are broadly used for the characterization of complex magnetic nanostructures, but they can be inconclusive when quantifying the amount of different magnetic phases present in a sample. In this paper, we first establish a framework for extracting quantitative parameters from FORC measurements conducted on samples composed of a single type of magnetic nanostructure to interpret their magnetic properties. We then generalize our framework for the quantitative characterization of samples that are composed of 2-4 types of FeCo magnetic nanowires to determine the most reliable and reproducible parameters for a detailed analysis of samples. Finally, we conclude that the parameter with the best quantification potential, backfield remanence coercivity, does not require the full FORC measurement. Our approach provides an insightful path for fast, quantitative analysis of complex magnetic nanostructures, especially determination of the ratios of magnetic subcomponents present in multi-phase samples.

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Section: Resultssupporting

confidence: 76%

Section: Experimental and Statistical Approachesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Beyond the qualitative description of complex magnetic nanoparticle arrays using FORC measurement

Kouhpanji

Stadler

2020

Nano Ex.

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“…In this method, nanoporous alumina is used as a template and metal nanorods are electrochemically grown inside pores of this membrane . The electrochemical growth of magnetic nanorods enables one to precisely control the size of the nanorods: the nanorod/nanotube radius is set by the template pores and the length is controlled by the time of electrochemical deposition . Magnetic nanorods of 100–200 nm diameter can be covered with polymers to prevent their agglomeration .…”

Section: Nanorod Synthesismentioning

confidence: 99%

Ferromagnetic Nanorods in Applications to Control of the In‐Plane Anisotropy of Composite Films and for In Situ Characterization of the Film Rheology

Kornev

2016

Adv Funct Materials

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3796 wileyonlinelibrary.com nanorods as the fi llers are believed to be the best candidates for materials working in extreme environment and hence they are on demand in aerospace and space exploration applications. [39][40][41][42][43] In composite fi lms needed for inductor and antennae applications, the alignment of magnetic particles is required to increase the high frequency permeability and to lower the hysteresis losses. [44][45][46][47] In applications to manufacturing of high density recording fi lms and discs, spin alignment is required to carry the recorded information when spins in magnetic nanorods are prone to align parallel to the nanorod axis. [ 37,[48][49][50] In optical applications, magnetic liquid crystals are attractive candidates for making reconfi gurable magnetooptical devices with the fast time response measured in milliseconds. [11][12][13][14][15][16][17][18][51][52][53] In all these applications, one needs to control the alignment of magnetic nanorods in liquid medium. Therefore, this problem is actively discussed in the literature; however, the general strategy for making macroscopic samples with ordered nanorods has not been developed yet and it remains the main challenge of materials engineering [32][33][34][35][39][40][41][42]54 ] Processing of multifunctional coatings and thin fi lms require many steps and hence one needs to control the fi lm properties at each step.Rheological properties of the fi lms at each stage of their processing play the most important role in nanorod ordering and keeping nanorods in place. Characterization of thin coating fi lms during composite manufacturing remains challenging. Different experimental methods have been proposed and developed for in situ characterization of rheological properties of thin fi lms and coatings. [ 20,[25][26][27][55][56][57][58][59][60] It appears that unique features of rotation of ferromagnetic nanorods can be used for characterization of very thin fi lms when other methods fall short. Recently introduced magnetic rotational spectroscopy (MRS) with nanoparticles and nanorods allows one to probe fl uid rheology in very thin fi lms and nanoliter droplets. [ 12,20,22,25,60,61 ] MRS takes advantage of a distinguishable behavior of rotating magnetic tracers as the frequency of applied rotating fi eld changes. Unlike many methods based on the analysis of small oscillations, which are diffi cult to interpret when the fi lm is very thin, MRS with magnetic nanorods enjoys analysis of full revolutions of magnetic tracers. [ 20,22,24,25,60,62,63 ] Understanding of the characteristic features of rotation of a single nanorod in complex fl uids and alignment of an assembly

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“…Because MNs show novel and interesting properties with a specific structure, they have been studied to investigate the dependence of geometrical parameters such as the wire diameter [36][37][38], segment thicknesses [28,[37][38][39][40][41][42], and aspect ratio [43,44] on the magnetic properties. Moreover, the hysteresis properties of the Ising-type multisegment nanowire with alternating magnetic spin-1/2 and spin-1 segments were investigated by using the EFT with correlations.…”

Section: Introductionmentioning

confidence: 99%

Geometry-Dependent Magnetic Properties of Ising-Type Multisegment Nanowires

Kantar

2016

J Supercond Nov Magn

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An effective-field theory (EFT) with correlations has been used to investigate magnetic hysteresis properties and soft/hard magnetic behaviors of an Ising-type multisegment nanowire (IMN) with ferromagnetic/non-magnetic segment structure. The effects of the geometrical parameters on the magnetic hysteresis properties are studied in detail. Morphological dependence of the segmented nanowire is presented via segment thickness (l), wire thickness (d), and aspect ratio (AR) obtained from the exchange interactions. The coercive field (H C ) and squareness (M r /M S ) of the IMN are also derived from hysteresis loops as a function of geometrical parameters. We find that the geometry has a significant effect on the magnetic characteristics of the nanowire. Comparisons between the observed theoretical results and some experimental works of nanowire arrays with hysteresis behaviors are made, and a very good agreement is obtained.

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Tuning magnetic fingerprints of FeNi nanowire arrays by varying length and diameter

Cited by 45 publications

References 56 publications

Beyond the qualitative description of complex magnetic nanoparticle arrays using FORC measurement

Beyond the qualitative description of complex magnetic nanoparticle arrays using FORC measurement

Ferromagnetic Nanorods in Applications to Control of the In‐Plane Anisotropy of Composite Films and for In Situ Characterization of the Film Rheology

Geometry-Dependent Magnetic Properties of Ising-Type Multisegment Nanowires

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