Granule size and shape influence on static and dynamic properties of magnetic nanocomposites

Bagmut, T. V.; Nedukh, S. V.; Roschenko, S.T.; Shipkova, I. G.; Tarapov, S. I.

doi:10.1016/j.jmmm.2005.09.028

Cited by 3 publications

(2 citation statements)

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“…It is known that magnetic loss mainly consists of natural resonance, domain-wall displacement, magnetic hysteresis and eddy current loss. [39][40][41] Due to the high resistivity of the composite and small size of the nanocrystals, the eddy effect can be effectively suppressed in the FeNi 3 /wax systems. Therefore, the broad magnetic loss peaks come from the natural resonance, which is the main magnetic loss in the caltrop-like FeNi 3 particles.…”

Section: Resultsmentioning

confidence: 99%

Hierarchical FeNi3 assemblies with caltrop-like architectures: synthesis, formation mechanism and magnetic properties

Huo

Liu

et al. 2012

CrystEngComm

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Hierarchical FeNi 3 assemblies with caltrop-like architectures have been successfully synthesized via a facile solution phase chemical route. The morphology evolution process and possible formation mechanism of FeNi 3 assemblies have been investigated. Magnetic measurements reveal that the coercivity, H c , of the FeNi 3 assemblies reaches approximately 320 Oe, which is much larger than for spherical particles. The enhancement of the coercivity may be attributed to the large shape anisotropy. The permeability measurements for the FeNi 3 /wax composite show that the imaginary, m99, part of the permeability possesses a very broad resonance peak in the 100 MHz-10 GHz frequency range. This broadened peak is believed to be due to the peculiar shape anisotropy of the caltrop-like architectures. The results indicate that the as-prepared hierarchical FeNi 3 assemblies with caltrop-like architectures have the potential to be used as efficient electromagnetic (EM) wave absorbers in the wide microwave frequency range.

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Section: Resultsmentioning

confidence: 99%

Hierarchical FeNi3 assemblies with caltrop-like architectures: synthesis, formation mechanism and magnetic properties

Huo

Liu

et al. 2012

CrystEngComm

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“…Note that local magnetic fields, which lead to the disordering of magnetic spin structure, can be described in terms of magnetic clusters (see for inst. [4]). While modeling the ESR lineshape it is possible to predict that the presence of such anisotropy fields leads to formation of magnetic clusters, which are elongated in the external magnetic static field direction.…”

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confidence: 99%

Magnetoresonance Research of Cox(Al2O3)1-x Nanogranular Films in the Vicinity of Magnetic Phase Transition

Bagmur¹,

Kravets²,

Nedukh³

et al. 2007

2007 International Kharkiv Symposium Physics and Engrg. Of Millimeter and Sub-Millimeter Waves (MSMW)

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2) IMag NASU and MESU, 36-b, Vernadsky blvd, Kiev, 03142, UKRAINE tel:38044249095, Fax 38044249095; apogor@imag. kiev. ua The research of fundamental features of granular layered magnetic nanostructures is of strong interest due to very attractive perspectives of their application in spintronics and nanoelectronics of Extra High Frequencies (EHF). In particular, spin dependent features of such structures, namely, the Giant Magnetic Resistance (GMR) can be used for development of novel generations of electronically tunable EHF-elements, for the prospective quantum computers design, etc. Thus the research of electron magnetic subsystems of these structures in the frequency band of their potential application seems to be of certain interest for specialists both in solid state physics and electronic technologies.Specimens. The Cox(A12O3)1-x nanogranular films with Co granules in A1203 matrix (where X is the volume concentration of Co ranging from 4% to 44%) with the thickness of about 150 nm were under study. The average size of Co granules is of 1-5 nm. The films were deposited on glass-ceramic substrates at room temperature in vacuum 10-4 Pa using the dual electron beam deposition technique (evaporation from Co and A1203 independent sources) [1]. The composition of the films was determined using energy dispersive analysis of x-ray.Experimental Static experiments data. The measurements of magnetoresistance (GMR) for "current-in-plane orientation" (the DC current and static magnetic field lie in plane of the specimen) have been carried out. The specimens demonstrated (Fig.1a) the maximum of GMR for the concentration of Co in the vicinity of X~30%.At the same time the phase transition dielectric-metal (Fig.lb) takes place at X~16 % (for X`16% -R-is of about 2.4 MQ).Note, that the GMI effect for 3 5-40 GHz was estimated as magnitudes less than 0.5 %. 5

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CTAB-mediated synthesis of iron–nickel alloy nanochains and their magnetic properties

Liu

Huo

et al. 2012

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Granule size and shape influence on static and dynamic properties of magnetic nanocomposites

Cited by 3 publications

References 10 publications

Hierarchical FeNi3 assemblies with caltrop-like architectures: synthesis, formation mechanism and magnetic properties

Hierarchical FeNi3 assemblies with caltrop-like architectures: synthesis, formation mechanism and magnetic properties

Magnetoresonance Research of Cox(Al2O3)1-x Nanogranular Films in the Vicinity of Magnetic Phase Transition

CTAB-mediated synthesis of iron–nickel alloy nanochains and their magnetic properties

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