Investigations of the compositional distribution in epitaxially grown CoCr thin films with enhanced saturation magnetisation

Rogers, David J.; Maeda, Yasushi; Krishnan, Kannan M.

doi:10.1016/s0304-8853(96)00351-4

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…It is known that the microchemical inhomogeneity (MCI) is referred to the compositional nonuniformity in nanometer or subnanometer scale and often exerts profound effects not only on the chemical and physical processes, but also on the properties and performance of the materials. − For example, Rogers et al reported that there was a drastic MCI in a Co 78 Cr 22 film grown epitaxially on Ru substrate by electron beam evaporation, resulting in an enhanced saturation in magnetization, and that the MCI was believed to play an important role in governing the magnetic properties of the Co−Cr alloy thin films. Consequently, the MCI has long been an active topic in condensed-matter physics, chemistry, and materials science.…”

Section: Introductionmentioning

confidence: 99%

Proposed Definition of Microchemical Inhomogeneity and Application To Characterize Some Selected Miscible/Immiscible Binary Metal Systems

Kong

Liu

2004

J. Phys. Chem. B

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A new parameter is proposed to quantify the microchemical inhomogeneity (MCI) for a general multicomponent system and is applied to characterize some selected binary metal systems, i.e., the Ag-Ru, Ag-Co, Ni-Ru, and Ni-Hf systems, through molecular dynamics simulations. For the equilibrium immiscible Ag-Ru, Ag-Co, and Ni-Ru systems, ab initio calculations are performed to acquire some physical properties for fitting the respective n-body potentials. On the basis of the derived potentials, simulations reveal that in the highly immiscible Ag-Ru system, when the solute concentration is less than one of the critical values, i.e., either 6 atom % of Ru or 10 atom % of Ag, in the Ag-based and Ru-based solid solutions, respectively, the MCI is a small positive number and that when the solute concentration exceeds the critical values, i.e., falls in a composition range of 6-90 atom % of Ag, the MCI rises sharply to a large positive value ranging from 0.8 to 0.95, suggesting an incomplete-phase-separation tendency, which may result in forming a nanometer/ subnanometer scaled structure. Similar simulations reveal that for the medium immiscible Ag-Co system, the MCI is about +0.7 within a composition range of 10-85 atom % of Ag and that for the Ni-Ru system, characterized by a nearly zero heat of formation, the MCI is nearly zero over the entire composition range, suggesting a possible metastable isomorphous phase diagram for the system, in which amorphous alloy, namely metallic glass, is hardly formed. In the contrast, for the miscible Ni-Hf system featuring a large negative heat of formation, the MCI is negative and is about -0.17 within a composition range of 25-80 atom % Ni, in which a crystalline solid solution prefers to turn into an amorphous state, corresponding almost exactly to the glass-forming range known from experiments as well as from theoretical prediction.

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Section: Introductionmentioning

confidence: 99%

Proposed Definition of Microchemical Inhomogeneity and Application To Characterize Some Selected Miscible/Immiscible Binary Metal Systems

Kong

Liu

2004

J. Phys. Chem. B

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Interatomic potentials of the binary transition metal systems and some applications in materials physics

et al. 2008

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Structural study of CoCrPt films by anomalous x-ray scattering and extended x-ray absorption fine structure

Chow

Sun

Soo

et al. 2002

Applied Physics Letters

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The correlation of elemental chemistry with the particular long-range order in question cannot be obtained by common conventional characterization techniques. Here we report a study of determining the elemental concentrations of the textured Bragg diffraction peak and the averaged local atomic environment of sputtered CoCrPt films using anomalous x-ray scattering and extended x-ray absorption fine structures. The elemental compositions of the textured peak in these polycrystalline nanostructured films differed from the average global film composition. The higher Cr concentration in the textured peak indicated that a significant amount of Cr did not segregate towards the grain boundaries as a result of the low sputtering temperature and pressure used. The structural observations were consistent with the magnetic results.

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Investigations of the compositional distribution in epitaxially grown CoCr thin films with enhanced saturation magnetisation

Cited by 4 publications

References 12 publications

Proposed Definition of Microchemical Inhomogeneity and Application To Characterize Some Selected Miscible/Immiscible Binary Metal Systems

Proposed Definition of Microchemical Inhomogeneity and Application To Characterize Some Selected Miscible/Immiscible Binary Metal Systems

Interatomic potentials of the binary transition metal systems and some applications in materials physics

Structural study of CoCrPt films by anomalous x-ray scattering and extended x-ray absorption fine structure

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