Interface magnetic anisotropy in cobalt clusters embedded in a platinum matrix

Jamet, M.; Négrier, M.; Dupuis, V.; Tuaillon-Combes, J.; Mélinon, P.; Pérez, A.; Wernsdorfer, Wolfgang; Barbara, B.; Baguenard, B.

doi:10.1016/s0304-8853(01)00695-3

Cited by 42 publications

(28 citation statements)

References 23 publications

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“…Another type of mixed clusters studied is the Co-Pt system because a hybridization between the 3d Co and the 5d Pt-orbitals is expected in this case. The Co-Pt alloy formation at nanosize scale would lead to a high magnetization and an increase of the magnetic anisotropy as previously observed in the case of pure Co clusters embedded in a Pt matrix [206]. From an experimental point of view, the use of a nanosecondpulsed laser associated with a continuous inert gas flow has been found necessary to conserve the target composition in the produced mixed Co-Pt clusters, as reported earlier in the case of the Co-Ag system.…”

Section: Structural and Magnetic Properties Of Mixed Co-ag And Co-pt supporting

confidence: 58%

Magnetic and Structural Properties of Isolated and Assembled Clusters

et al. 2005

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Section: Structural and Magnetic Properties Of Mixed Co-ag And Co-pt supporting

confidence: 58%

Magnetic and Structural Properties of Isolated and Assembled Clusters

et al. 2005

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“…It results from the interdiffusion of Co atoms from the previously formed Co clusters towards the Pt matrix, as observed in other Co-Pt systems produced by sputtering [11] and LECBD [61] at room temperature. The composition of the Co x Pt 1−x alloy present in all Co-Pt granular samples seems to be close to Co 0.5 Pt 0.5 , according to the EXAFS results.…”

Section: Discussionmentioning

confidence: 66%

Structural and magnetic properties of granular Co-Pt multilayers with perpendicular magnetic anisotropy

et al. 2014

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We present a study of granular Co-Pt multilayers by means of high-resolution transmission electron microscopy (HRTEM), extended x-ray absorption fine structure (EXAFS), SQUID-based magnetic measurements, anomalous Hall effect (AHE), and x-ray magnetic circular dichroism (XMCD). We describe these granular films as composed of particles with a pure cobalt core surrounded by an alloyed Co-Pt interface, embedded in a Pt matrix. The alloy between the Co and Pt in these granular films, prepared by room temperature sputter deposition, results from interdiffusion of the atoms. The presence of this alloy gives rise to a high perpendicular magnetic anisotropy (PMA) in the granular films, as consequence of the anisotropy of the orbital moment in the Co atoms in the alloy, and comparable to that of highly-ordered CoPt L1 0 alloy films. Their magnetic properties are those of ferromagnetically coupled particles, whose coupling is strongly temperature dependent: at low temperatures, the granular sample is ferromagnetic with a high coercive field; at intermediate temperatures the granular film behaves as an amorphous asperomagnet, with a coupling between the grains mediated by the polarized Pt, and at high temperatures, the sample has a superparamagnetic behavior. The coupling/decoupling between the grains in our Co-Pt granular films can be tailored by variation of the amount of Pt in the samples.

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“…technique [19,20]. silica clusters increases, fractal structure is developed and, finally, the percolation threshold is reached.…”

Section: Magnetic Scattering Centersmentioning

confidence: 99%

Correlation between the extraordinary Hall effect and resistivity

et al. 2004

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We study the contribution of different types of scattering sources to the extraordinary Hall effect. Scattering by magnetic nano-particles embedded in normal-metal matrix, insulating impurities in magnetic matrix, surface scattering and temperature dependent scattering are experimentally tested. Our new data, as well as previously published results on a variety of materials, are fairly interpreted by a simple modification of the skew scattering model.

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Interface magnetic anisotropy in cobalt clusters embedded in a platinum matrix

Cited by 42 publications

References 23 publications

Magnetic and Structural Properties of Isolated and Assembled Clusters

Magnetic and Structural Properties of Isolated and Assembled Clusters

Structural and magnetic properties of granular Co-Pt multilayers with perpendicular magnetic anisotropy

Correlation between the extraordinary Hall effect and resistivity

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