Synthesis and magnetic characterization of Co-NiO-Ni core-shell nanotube arrays

Chen, Junyang; Ahmad, Naeem; Shi, Dean; Zhou, W. P.; Han, X. F.

doi:10.1063/1.3646491

Cited by 34 publications

(16 citation statements)

References 53 publications

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“…2b). Such increase at low temperature has also been found in previous studies of ferromagnetic Co-NiO-Ni nanotube [28], which further indicated that our samples show ferromagnetism. Fig.…”

Section: Resultssupporting

confidence: 80%

Significant room-temperature ferromagnetism in porous ZnO films: The role of oxygen vacancies

Hou

Liu

Sun

et al. 2015

Materials Science and Engineering: B

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“…2b). Such increase at low temperature has also been found in previous studies of ferromagnetic Co-NiO-Ni nanotube [28], which further indicated that our samples show ferromagnetism. Fig.…”

Section: Resultssupporting

confidence: 80%

Significant room-temperature ferromagnetism in porous ZnO films: The role of oxygen vacancies

Hou

Liu

Sun

et al. 2015

Materials Science and Engineering: B

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“…Magnetic nanorods of 100–200 nm diameter can be covered with polymers to prevent their agglomeration . One can generate Ni, Co, permalloy, and other metallic nanorods and nanotubes . As an example, the Scanning Electron Microscope (SEM) image shown in Figure shows nickel and cobalt nanorods produced in our laboratory.…”

Section: Nanorod Synthesismentioning

confidence: 99%

“…This behavior is favorable for easy alignment of magnetic nanorods during formation of thin coating films. Magnetic behavior of nanotubes is more complex and the methods of their processing for magnetic nanocomposites requires further investigation.…”

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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“…From the FORC diagrams, one can extract the profiles of the magnetic interactions and coercivity distributions (Proenca et al, 2013b). On the other hand, due to the empty inner core of the NTs, a different magnetization distribution is created (Landeros et al, 2007Chen et al, 2011b), which is mainly allocated parallel to the tube axis, thus leading to the canting of the spins near the tube ends (Proenca et al, 2013c). When comparing several Co nanostructured arrays (high-aspect-ratio NWs and NTs, small-aspect-ratio nanopillars, and thin film nanohole arrays), the highest magnetostatic interactions were found to occur for the NWs case (Figure 24.20a;Proenca et al, 2013c).…”

Section: Interactionsmentioning

confidence: 99%