Magnetism of single-crystalline Co nanorods

Soulantica, Katerina; Wetz, Fabienne; Maynadié, Jèrôme; Falqui, Andrea; Tan, Reasmey P.; Blon, Thomas; Chaudret, Bruno; Respaud, Marc

doi:10.1063/1.3237157

Cited by 57 publications

(64 citation statements)

References 15 publications

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“…7,8 For example, single-crystalline cobalt nanorods are ideal candidates for applications in ultra-highdensity magnetic recording devices, due to their high magnetic moment and high magnetic anisotropy (magneto-crystalline and shape). 9 A regular array of Co nanorods positioned the one next to the other and exposing their tips could correspond to a high density magnetic recording configuration in which each nanorod would ideally represent a bit of information. Such arrays can be obtained during Co nanorod synthesis by H 2 reduction of organometallic or coordination Co compounds in the presence of long chain amines and long chain acids.…”

Section: Introductionmentioning

confidence: 99%

Concerted Growth and Ordering of Cobalt Nanorod Arrays as Revealed by Tandem in Situ SAXS-XAS Studies

Cormary

Li²,

Liakakos

et al. 2016

J. Am. Chem. Soc.

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The molecular and ensemble dynamics for the growth of hierarchical supercrystals of cobalt nanorods have been studied by in situ tandem X-ray absorption spectroscopy-small-angle X-ray scattering (XAS-SAXS). The supercrystals were obtained by reducing a Co(II) precursor under H2 in the presence of a long-chain amine and a long-chain carboxylic acid. Complementary time-dependent ex situ TEM studies were also performed. The experimental data provide critical insights into the nanorod growth mechanism and unequivocal evidence for a concerted growth-organization process. Nanorod formation involves cobalt nucleation, a fast atom-by-atom anisotropic growth, and a slower oriented attachment process that continues well after cobalt reduction is complete. Smectic-like ordering of the nanorods appears very early in the process, as soon as nanoparticle elongation appears, and nanorod growth takes place inside organized superlattices, which can be regarded as mesocrystals.

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Section: Introductionmentioning

confidence: 99%

Concerted Growth and Ordering of Cobalt Nanorod Arrays as Revealed by Tandem in Situ SAXS-XAS Studies

Cormary

Li²,

Liakakos

et al. 2016

J. Am. Chem. Soc.

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show abstract

“…[15] Thel iquid crystalline elastomer was synthesized by ah ydrosilylation [13,16] reaction at room temperature in at wo-step procedure.T he poly(methylhydrogenosiloxane) backbone was mixed with 0.9 silane equivalents of mesogens and the catalyst in am inimum quantity of toluene.Along aliphatic diene was then used to cross-link the remaining reactive silane functions;0.5 wt %nanorods were also added in this second step.T oo btain macroscopically oriented samples,a1T uniform magnetic field, produced by an electromagnet, was applied during cross-linking.B oth oriented and non-oriented, 1mmt hick samples were prepared for comparison.…”

Section: Methodsmentioning

confidence: 99%

Room‐Temperature, Strain‐Tunable Orientation of Magnetization in a Hybrid Ferromagnetic Co Nanorod–Liquid Crystalline Elastomer Nanocomposite

et al. 2015

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Hybrid nanocomposites based on magnetic nanoparticles dispersed in liquid crystalline elastomers are fascinating emerging materials. Their expected strong magneto-elastic coupling may open new applications as actuators, magnetic switches, and for reversible storage of magnetic information. We report here the synthesis of a novel hybrid ferromagnetic liquid crystalline elastomer. In this material, highly anisotropic Co nanorods are aligned through a cross-linking process performed in the presence of an external magnetic field. We obtain a highly anisotropic magnetic material which exhibits remarkable magneto-elastic coupling. The nanorod alignment can be switched at will at room temperature by weak mechanical stress, leading to a change of more than 50 % of the remnant magnetization ratio and of the coercive field.

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“…As base particles, we employ magnetic nanorods synthesized by an organometallic approach which produces single crystalline (hcp) Co-nanorods with a uniform diameter of 6 nm and adjustable length between 40 and 200 nm with narrow size distribution 29 . Next, a noble metal shell is synthesized around the Co-core in order to protect the core from oxidation and to provide amplification of the optical signal.…”

Section: Nanoprobe Synthesismentioning

confidence: 99%

Integrated optical waveguide and nanoparticle based label-free molecular biosensing concepts

Hainberger

Müellner

Melnik

et al. 2014

Frontiers in Biological Detection: From Nanosensors to Systems VI

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We present our developments on integrated optical waveguide based as well as on magnetic nanoparticle based label-free biosensor concepts. With respect to integrated optical waveguide devices, evanescent wave sensing by means of MachZehnder interferometers are used as biosensing components. We describe three different approaches: a) silicon photonic wire waveguides enabling on-chip wavelength division multiplexing, b) utilization of slow light in silicon photonic crystal defect waveguides operated in the 1.3 µm wavelength regime, and c) silicon nitride photonics wire waveguide devices compatible with on-chip photodiode integration operated in the 0.85 µm wavelength regime. The nanoparticle based approach relies on a plasmon-optical detection of the hydrodynamic properties of magnetic-core/gold-shell nanorods immersed in the sample solution. The hybrid nanorods are rotated within an externally applied magnetic field and their rotation optically monitored. When target molecules bind to the surfaces of the nanorods their hydrodynamic volumes increase, which directly translates into a change of the optical signal. This approach possesses the potential to enable real-time measurements with only minimal sample preparation requirements, thus presenting a promising pointof-care diagnostic system.

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Magnetism of single-crystalline Co nanorods

Cited by 57 publications

References 15 publications

Concerted Growth and Ordering of Cobalt Nanorod Arrays as Revealed by Tandem in Situ SAXS-XAS Studies

Concerted Growth and Ordering of Cobalt Nanorod Arrays as Revealed by Tandem in Situ SAXS-XAS Studies

Room‐Temperature, Strain‐Tunable Orientation of Magnetization in a Hybrid Ferromagnetic Co Nanorod–Liquid Crystalline Elastomer Nanocomposite

Integrated optical waveguide and nanoparticle based label-free molecular biosensing concepts

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