Investigations of compositional separation in Co-Cr thin film recording media

Rogers, David J.; Maeda, Yasushi; Takei, Kuniharu; Chapman, J. N.; Bernards, J.P.C.; Schrauwen, C.P.G.

doi:10.1016/0304-8853(94)90701-3

Cited by 8 publications

(3 citation statements)

References 21 publications

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“…The XRD patterns of arrays of CoCr NCWs are presented in Figure a. Since solubility of Cr in Co is ∼2 mol % as found in the NMR study, − phase separation should occur when the Cr mole percentage is more than ∼2. Unless the Cr mole percentage is sufficiently large, however, only the fcc structure will be observed in the XRD patterns.…”

Section: Resultsmentioning

confidence: 87%

“…However, the XRD pattern (VI) with a large Cr mole percentage is different from (i.e., broader than) the others (I)−(V). It is likely that the broad peak in (VI) is due to the overlap between the two peaks, originating from phase separation, i.e., one from the fcc Co-rich phase (majority) and the other from the bcc Cr-rich phase (minority) because fcc Co (111) and bcc Cr (110) peaks closely occur at 44.26° and 43.51°, respectively. , Lattice constants (Figure b) slightly increase up to 0.8 mol % Cr and then become nearly constant up to 3.2 mol % Cr within an experimental limit, implying that solubility of Cr in Co nanoclusters is 2−3 mol % Cr, as consistent with the NMR study. − The slight increase of the lattice constant with increasing Cr mole percentage is because the Cr atom has a slightly larger atomic radius than the Co atom. A large deviation of the last point from the others is likely due to the overlap between the fcc Co and bcc Cr peaks, as mentioned before.…”

Section: Resultsmentioning

confidence: 99%

“…Recently, it was reported that ferromagnetic Co-rich phase contained about 2 at. % Cr from NMR study − and 0.5−1.0 at. % Cr from an empirical calculation based on high-temperature experimental data, implying that solubility of Cr in Co is ∼2 mol % Cr.…”

Section: Introductionmentioning

confidence: 99%

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CoCr Binary Nanocluster Wires: Enhanced Magnetic Properties of the Co-rich Phase

et al. 2002

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We report fabrication of CoCr binary nanocluster wires (NCWs) by thermally decomposing Co 2 (CO) 8 /Cr(CO) 6 metal carbonyl vapors by using a resistive heater placed in the middle of a pair of permanent disk magnets. In general, NCWs grow through the pile-up of binary CoCr nanoclusters perpendicularly to the substrates attached to the magnet surfaces. NCWs, ranging from 10 to 20 nm in diameter and also branching out while they grow, exist as a bundle. The bundles with lengths up to 2-3 mm form a three-dimensional array. We observed much higher coercivities and larger remanences for arrays with magnetic field applied parallel to the NCWs than those with magnetic field applied perpendicular to the NCWs. Importantly, we observed that arrays of CoCr NCWs with a 0.8-2.2 mol % Cr in which only Co-rich phase exists showed enhanced magnetic properties, that is, nearly doubled coercivities compared to that of the array of pure Co NCWs. When the Cr mole percentage is above 2.2, however, coercivities decreased because the amount of nonmagnetic Cr-rich phase increased accordingly.

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Section: Resultsmentioning

confidence: 87%