Medium-range order as an intrinsic property of Co-rich amorphous alloys

Fdez-Gubieda, M. L.; Garcı́a-Arribas, A.; Orúe, I.; Plazaola, F.; Barandiarán, J.M.

doi:10.1209/epl/i1997-00422-6

Cited by 12 publications

(17 citation statements)

References 13 publications

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“…Fitting results show that the interatomic distance, R, and the disorder level quantified by the Debye -Waller factor, σ 2 , in the Co-W NPs are strongly affected by the presence of W in the structure, showing the distortion of the Co-Co and Co-W bonds in the amorphous Co-W alloy. These values found for σ 2 are typical of disordered Co environments, e.g., in Co-rich amorphous alloys [102]. It is also observed that the highest σ 2 is obtained in the Co-W bonds, confirming the high amorphicity created by W in the Co nanoparticles.…”

Section: Co K Edge Resultssupporting

confidence: 57%

Magnetic nanoparticles studied by synchroton radiation and rf transverse susceptibility

Garcia¹,

Sanjoaquín²,

Vinuesa³

2013

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Section: Co K Edge Resultssupporting

confidence: 57%

Magnetic nanoparticles studied by synchroton radiation and rf transverse susceptibility

Garcia¹,

Sanjoaquín²,

Vinuesa³

2013

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“…It has been observed that there exists a preferred chemical affinity of phosphorus for the cobalt rather than for the iron when both types of metal are present, as it is the case in Fe-Co-P amorphous alloys. 50,51 Such chemical affinities have also been observed in Fe-Co-Si-B samples, where the preferred bondings are Fe-B and Co-Si. 30,50 It is to be expected that these distinct affinities affect the bonding characteristic of Fe-P and Co-P pairs, and therefore, the structure of the binary alloys Fe-P and Co-P.…”

Section: ͑7͒mentioning

confidence: 62%

Comparative study of the structure and magnetic properties of Co-P and Fe-P amorphous alloys

2000

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We present the structural parameters of a complete series of Co 1Ϫx P x (xϭ0.17Ϫ0.26) amorphous alloys as obtained by the analysis of x-ray absorption fine structure measurements. To investigate their correlation with the magnetic properties, we have performed magnetization measurements in the same set of samples, obtaining the concentration dependence of the saturation magnetization, Curie temperature, and the behavior of the low-temperature magnetization. The results for the Co-P system are then compared with the ones of amorphous Fe-P, in order to clarify whether the different structural features found can be used to explain the different behavior of the magnetic properties that these systems exhibit. The evolution of the spontaneous magnetization with the metalloid content is the same for both systems. The Curie temperature decreases appreciably in Co-P, while remaining unchanged in Fe-P. The main result of the structural analysis shows that the bonding distances between metal atoms increases in the Co-P system, whereas they do not change in Fe-P. These magnetic and structural differences are correlated in basis of simple magnetic models.

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“…6 and the values obtained in each case are listed in Table II. A e.g., in Co-rich amorphous alloys. 54 It is also observed that the highest σ 2 is obtained in the Co-W bonds, confirming the high amorphicity created by W in the Co nanoparticles.…”

mentioning

confidence: 64%

Structural and Magnetic Properties of Amorphous Co–W Alloyed Nanoparticles

Figueroa

2014

Springer Theses

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W-capped Co nanoparticles dispersed in an alumina matrix are studied by means of high-resolution transmission electron microscopy, extended x-ray absorption fine structure, SQUID-based magnetic measurements, dc magnetization, ac magnetic susceptibility, and x-ray magnetic circular dichroism. Results show the formation of amorphous Co-W alloy nanoparticles, the magnetic properties of which are modified by the amount of W or Co present in the samples. The average Co magnetic moment depends on the number of W atoms surrounding it. Co-W particles show superparamagnetic behavior and are described as an array of noninteracting particles with random anisotropy axes and an average moment per particle proportional to the particle volume and to the average Co moment for each alloy composition. Values of the magnetic anisotropy constant of the particles are on the order of 10 6 erg/cm 3 , higher than that of bulk Co. Evidence of short-range ordering within each amorphous particle is found that provides insight of the origin of their magnetic anisotropy.

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Medium-range order as an intrinsic property of Co-rich amorphous alloys

Cited by 12 publications

References 13 publications

Magnetic nanoparticles studied by synchroton radiation and rf transverse susceptibility

Magnetic nanoparticles studied by synchroton radiation and rf transverse susceptibility

Comparative study of the structure and magnetic properties of Co-P and Fe-P amorphous alloys

Structural and Magnetic Properties of Amorphous Co–W Alloyed Nanoparticles

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