Effect of the second-order anistropy constant on the transverse susceptibility of uniaxial ferromagnets

Spînu, Leonard; Stancu, A.; O’Connor, Charles J.; Srikanth, H.

doi:10.1063/1.1428626

Cited by 19 publications

(6 citation statements)

References 12 publications

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“…For Co10 sample, one observes that as the applied magnetic field is decreasing, first a small peak appears around 700 Oe followed by a higher amplitude peak around 200 Oe. This is consistent with the results predicted by the classical model of for a random noninteracting uniaxial monodomain particles [3], [6] where an anisotropy field distribution is present [2]. In the case of Co100 one notices that for the same positive to negative field sweep, first a higher amplitude peak appears followed by a lower amplitude one.…”

Section: Times (supporting

confidence: 90%

RF dynamics in nanoparticle systems with tuned strength of interactions

et al. 2002

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The dynamic response in a large experimental time window (10 6 -10 2 s) of Co and CoPt nanoparticle systems is reported. In order to reveal the dynamics effects, along with classic experiments as a.c. susceptibility and static magnetic measurements, a rf temperature dependent transverse susceptibility experiment is used. To study the effect of interaction between particles, samples of Co and CoPt nanoparticles dispersed in an insulated matrix in different volume fractions were investigated.

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Section: Times (supporting

confidence: 90%

RF dynamics in nanoparticle systems with tuned strength of interactions

et al. 2002

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“…Subsequently, as TS was more frequently used as a method for magnetic anisotropy investigations, the interest for TS grew exponentially and many studies contributed to the improvement of both theory and experimental method. Thus, some of the restrictions in the first theoretical approach of Aharoni et al 8 were overcome [10][11][12][13][14][15] and the increased sensitivity of new experimental TS methods allowed the investigations of magnetic systems with very low concentration of magnetic moments. 3,4,16,17 A very recent development of TS constitutes the complex TS.…”

Section: Introductionmentioning

confidence: 99%

Physics of complex transverse susceptibility of magnetic particulate systems

2007

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Complex transverse susceptibility is a recent proposed method for the determination of anisotropy and volume distributions in particulate magnetic media. So far, only thermal fluctuations and rate-dependent damped dynamics of the magnetic moment have been identified as reasons for the existence of the imaginary transverse susceptibility. In this paper, we apply a more general approach to derive the complex transverse susceptibility, and we show that the hysteresis phenomenon is the most general concept behind the existence of complex transverse susceptibility. In this paper, the physical origins of the imaginary part of transverse susceptibility are analyzed: rate-independent hysteresis, viscous-type rate-dependent hysteresis, and thermal relaxation effect origin. The rate-independent origin is an intrinsic contribution to the imaginary transverse susceptibility and cannot be neglected because it is a zero-temperature effect.

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“…It has been theoretically shown that the TS spectrum in a unipolar field scan from positive to negative saturation should consist of three singularities of which two occur at the anisotropy fields (±H k ) and one at the switching field (±H s ) [34,35]. However, we have experimentally shown that for an array of nanoparticles with a distribution in size, the switching peak is often merged with one of the anisotropy peaks and a marked asymmetry in both peak location heights can be seen [33].…”

Section: Resultsmentioning

confidence: 99%

Transverse Susceptibility as a Biosensor for Detection of Au-Fe3O4 Nanoparticle-Embedded Human Embryonic Kidney Cells

Huls

Phan

Kumar

et al. 2013

Sensors

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We demonstrate the possibility of using a radio-frequency transverse susceptibility (TS) technique based on a sensitive self-resonant tunnel-diode oscillator as a biosensor for detection of cancer cells that have taken up magnetic nanoparticles. This technique can detect changes in frequency on the order of 10 Hz in 10 MHz. Therefore, a small sample of cells that have taken up nanoparticles when placed inside the sample space of the TS probe can yield a signal characteristic of the magnetic nanoparticles. As a proof of the concept, Fe3O4 nanoparticles coated with Au (mean size ∼60 nm) were synthesized using a micellar method and these nanoparticles were introduced to the medium at different concentrations of 0.05, 0.1, 0.5, and 1 mg/mL buffer, where they were taken up by human embryonic kidney (HEK) cells via phagocytosis. While the highest concentration of Au-Fe3O4 nanoparticles (1 mg/mL) was found to give the strongest TS signal, it is notable that the TS signal of the nanoparticles could still be detected at concentrations as low as 0.1 mg/mL.

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Effect of the second-order anistropy constant on the transverse susceptibility of uniaxial ferromagnets

Cited by 19 publications

References 12 publications

RF dynamics in nanoparticle systems with tuned strength of interactions

RF dynamics in nanoparticle systems with tuned strength of interactions

Physics of complex transverse susceptibility of magnetic particulate systems

Transverse Susceptibility as a Biosensor for Detection of Au-Fe3O4 Nanoparticle-Embedded Human Embryonic Kidney Cells

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