Compositional microstructures in Co-Cr films for magnetic recording

Maeda, Yasushi; Takei, Kuniharu; Rogers, David J.

doi:10.1016/0304-8853(94)00257-6

Cited by 11 publications

(2 citation statements)

References 21 publications

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“…All depositions were performed at room temperature (RT) using a pure Ar pressure of 4 × 10 −1 Pa. It is worth mentioning that our deposition temperature was specifically selected in order to avoid diffusion or segregation effects that commonly occur at elevated temperatures [39,40,41,42,43]. The symmetric (oscillatory) layer structures were deposited by co-sputtering of Co and Cr (Ru) targets keeping the power of Co constant while changing that of the dopant material in order to achieve the intended composition profile.…”

Section: Epitaxial Graded Structuresmentioning

confidence: 99%

Modulation of Magnetic Properties at the Nanometer Scale in Continuously Graded Ferromagnets

et al. 2018

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Ferromagnetic alloy materials with designed composition depth profiles provide an efficient route for the control of magnetism at the nanometer length scale. In this regard, cobalt-chromium and cobalt-ruthenium alloys constitute powerful model systems. They exhibit easy-to-tune magnetic properties such as saturation magnetization MS and Curie temperature TC while preserving their crystalline structure over a wide composition range. In order to demonstrate this materials design potential, we have grown a series of graded Co1−xCrx and Co1−wRuw (101¯0) epitaxial thin films, with x and w following predefined concentration profiles. Structural analysis measurements verify the epitaxial nature and crystallographic quality of our entire sample sets, which were designed to exhibit in-plane c-axis orientation and thus a magnetic in-plane easy axis to achieve suppression of magnetostatic domain generation. Temperature and field-dependent magnetic depth profiles have been measured by means of polarized neutron reflectometry. In both investigated structures, TC and MS are found to vary as a function of depth in accordance with the predefined compositional depth profiles. Our Co1−wRuw sample structures, which exhibit very steep material gradients, allow us to determine the localization limit for compositionally graded materials, which we find to be of the order of 1 nm. The Co1−xCrx systems show the expected U-shaped TC and MS depth profiles, for which these specific samples were designed. The corresponding temperature dependent magnetization profile is then utilized to control the coupling along the film depth, which even allows for a sharp onset of decoupling of top and bottom sample parts at elevated temperatures.

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Section: Epitaxial Graded Structuresmentioning

confidence: 99%

Modulation of Magnetic Properties at the Nanometer Scale in Continuously Graded Ferromagnets

et al. 2018

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“…. Cr, whose content is about 10-20 at%, is observed to segregate at the grain boundaries and inside the grains [1]. The compositional separation is the main reason for the reduction of intergranular interaction, which causes the coercivity to increase.…”

Section: Introductionmentioning

confidence: 99%