Magnetic properties of cluster-beam-synthesized cobalt: Noble-metal films

Meldrim, J. Mark; Qiang, You; Liu, Yi; Haberland, Hellmut; Sellmyer, David J.

doi:10.1063/1.372915

Cited by 33 publications

(19 citation statements)

References 22 publications

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“…High resolution transmission electron spectroscopy (HR-TEM) was performed on the sample of n = 6500 in order to verify the structural integrity. In accordance with previous publications [26], an ordered crystalline lattice of both matrix and cluster was found showing wellseparated, intact and near spherical clusters. The larger clusters ( n ≥ 600) can be considered well separated, as was verified by HR-TEM, nevertheless the dipolar interactions especially for the largest clusters can be estimated to possibly be as large as several meV, depending on both the exact distance as well as the amount of quenching of the magnetic moment per atom in the copper matrix [10].…”

Section: Resultssupporting

confidence: 77%

Monodispersed metal clusters in solid matrices: A new experimental setup

Hillenkamp

Domenicantonio

Félix

2006

Review of Scientific Instruments

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We describe a new experimental setup for the production of samples of metal clusters embedded in matrices stable at ambient conditions. The cluster ions are generated in the gas phase and codeposited fragmentation-free together with the evaporated matrix. Mean cluster sizes range from a few to many thousands of atoms. For small clusters (n < 20) mass selection is possible, larger clusters are deposited in narrow size distributions. Matrix materials include metals (Cu, Ag) and oxides such as quartz. The performance of the apparatus as well as sample characterization procedures are described. We show first results on the magnetic properties of different cobalt cluster size distributions ( n = 15, 600, 2300, 6500) embedded in copper matrices, demonstrating inter-cluster as well as cluster-lattice interactions.

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Section: Resultssupporting

confidence: 77%

Monodispersed metal clusters in solid matrices: A new experimental setup

Hillenkamp

Domenicantonio

Félix

2006

Review of Scientific Instruments

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“…In a system with a mixture of pure Co and Co/CoO core-shell clusters the magnetization shows a mixture of shifted and unshifted loops. 16 Apart from an exchange bias field H eb ϳ 0.5 T, a coercive field H c ϳ 0.5 T was found. Enhancement of coer-civity is another critical characteristic of exchange bias systems.…”

Section: Resultsmentioning

confidence: 93%

Magnetic and structural properties of Co nanocluster thin films

et al. 2005

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In this work we report on the magnetic characterization of thin films composed of gas-phase cobalt nanoclusters deposited on surfaces. Measurements of magnetization curves at ambient temperature indicate a strong exchange interaction between the clusters, while at cryogenic temperatures an exchange bias field appears. The latter confirms the existence of a ferromagnetic/antiferromagnetic core-shell system. Temperature-dependent magnetization measurements under zero-field-cooled conditions showed a rather broad maximum situated around 200 K. Magnetic force microscopy indicates the formation of a correlated super-spin-glass ͑CSSG͒ resulting from the frustration between the interparticle exchange interaction and the randomly oriented intraparticle anisotropy. The approach to saturation of the magnetization curves at 295 K is consistent with a CSSG.

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“…However, it proves to be more difficult to prepare monodispersed nanoparticles by the traditional gas condensation method because the synthesis process is more complex. There are only a few reports on the fabrication of monodispersed nanoparticles by means of gas condensation [16,17]. One way of obtaining monodispersed magnetic nanoparticles by the gas condensation method is to combine a size-selective apparatus with it.…”

Section: Introductionmentioning

confidence: 99%