Magnetization reversal of a single cobalt cluster using a RF field pulse

Tamion, Alexandre; Raufast, Cécile; Bonet, Edgar; Dupuis, V.; Fournier, Thierry; Crozes, T.; Bernstein, E.; Wernsdorfer, Wolfgang

doi:10.1016/j.jmmm.2009.04.013

Cited by 16 publications

(14 citation statements)

References 9 publications

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“…6 Note also that carbon revealed to be a very well adapted matrix used in an improved micro-superconducting quantum interference device (SQUID) device to study the intrinsic cluster MAE and dynamical magnetization reversal processes at the nanosecond scale of single Co clusters counting only a thousand spins. 7 The "triple fit" procedure, 8 which uses m(H), where m is the measured magnetic moment and H the applied field, and Zero-Field Cooled (ZFC)=Field Cooled (FC) susceptibility measurements, is a very efficient laboratory technique to evidence the possible presence of a non-magnetic shell around small nanoparticles, very hard to detect from other structural characterization techniques. In this article, we show that a monolayer of nonmagnetic carbide exists at the Co cluster interface in the asprepared sample and disappears upon thermal treatment.…”

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confidence: 99%

Demixing in cobalt clusters embedded in a carbon matrix evidenced by magnetic measurements

Tamion

Hillenkamp

Hillion

et al. 2011

Journal of Applied Physics

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We report on the magnetic properties of cobalt clusters embedded in amorphous carbon using magnetic and structural investigations. From the analysis of the mFC, mZFC, and m(H) curves, we determine the Co magnetic diameter probability density function. An initially magnetically dead interface layer is attributed to a metastable carbide. We found that annealing at 750 K favors the graphitization of the matrix and removes the dead layer without deteriorating the nanoparticle size distribution or changing the magnetic anisotropy constant.

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confidence: 99%

Demixing in cobalt clusters embedded in a carbon matrix evidenced by magnetic measurements

Tamion

Hillenkamp

Hillion

et al. 2011

Journal of Applied Physics

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“…Difficult experiments have been carried out to study the electronic and magnetic properties of individual magnetic nanoparticles [1][2][3][4][5][6][7][8][9][10][11] . Some of these experiments 4,6 focus on electron tunneling measurements of discrete energy levels of the nanoparticles.…”

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confidence: 99%

“…These works improved the understanding of ferromagnetism and tunneling transport in nanoparticles. On the other hand, some experiments are performed to directly investigate the magnetization of nanoparticles using magnetic force microscopy 1 and microSQUID (micro superconducting quantum interference device) 2,3,5,8,9,11 . Radio-frequency (RF) field pulse can reduce the magnetization switching field of a Co nanoparticle, and ferromagnetic resonance at low temperatures can produce a bimodal distribution of the switching field.…”

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confidence: 99%

Microwave coupled electron tunneling measurement of Co nanoparticles

Jiang

Birk

Davidović

2011

Applied Physics Letters

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We study electron tunneling through Co nanoparticles in the presence of repeated microwave pulses at 4.2K. While individual pulses are too weak to affect the magnetic switching field, repeated microwave pulses start to reduce the magnetic switching field at 10{\mu}s spacing. We use I-V curve as a thermometer to show that the microwave pulses do not heat the sample, showing that magnetization in Co nanoparticles is directly excited by microwave pulses, and the relaxation time of the excitation energy is in the range of microsecond.Comment: 10 pages, 5 figure

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“…), we observe that, as expected, the magnetic size distribution is almost unchanged upon annealing and is in full agreement with the geometrical size distribution deduced from GISAXS. To go further, a theoretical model based on a combined Stoner-Wohlfarth and Néel relaxation description, has been used to fit the hysteresis loops, taking into account the magnetic size distribution [56,[58][59][60][61]. A biaxial description has been adopted for the magnetic anisotropy [57], in order to reflect the non ideal morphology of the nanoparticles.…”

Section: Moreover the Particle Shape Is Modeled By Truncated Spheres mentioning

confidence: 99%

Elaboration of Nanomagnet Arrays: Organization and Magnetic Properties of Mass-Selected FePt Nanoparticles Deposited on Epitaxially Grown Graphene on Ir(111)

et al. 2019

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The moiré pattern created by the epitaxy of a graphene sheet on an iridium substrate can be used as a template for the growth of 2D atomic or cluster arrays. We observed for the first time a coherent organization of hard magnetic preformed FePt nanoparticles on the 2D lattice of graphene/Ir(111). Nanoparticles of 2 nm diameter have been mass-selected in gas phase and deposited with a low energy on the hexagonal moiré pattern. Their morphology and organization have been investigated using Grazing Incidence Small Angle X-ray Scattering, while their magnetic properties have been studied by X-ray Magnetic Circular Dichroism, both pointing to a FePt cluster/graphene surface specific interaction. The spatial coherence of the nanoparticles is preserved upon annealing up to 700°C where the hard magnetic phase of FePt is obtained.

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Magnetization reversal of a single cobalt cluster using a RF field pulse

Cited by 16 publications

References 9 publications

Demixing in cobalt clusters embedded in a carbon matrix evidenced by magnetic measurements

Demixing in cobalt clusters embedded in a carbon matrix evidenced by magnetic measurements

Microwave coupled electron tunneling measurement of Co nanoparticles

Elaboration of Nanomagnet Arrays: Organization and Magnetic Properties of Mass-Selected FePt Nanoparticles Deposited on Epitaxially Grown Graphene on Ir(111)

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