Growth of Co/Ru strained superlattices

Müller, D.; Ounadjela, K.; Vennéguès, P.; Pierron‐Bohnes, V.; Arbaoui, A.; Jay, J.P.; Dinia, A.; Panissod, P.

doi:10.1016/0304-8853(92)91585-h

Cited by 30 publications

(8 citation statements)

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“…In ͑c͒-͑f͒ the separate Co ͑outer͒ and Ag ͑inner͒ streaks are marked by arrows: ͑a͒ and ͑b͒ completed 150-Å-thick Ru buffer layer on mica, ͑c͒ and ͑d͒ 60 Å Co 43 Ag 57 deposited at HT ͑450°C͒, ͑e͒ and ͑f͒ 380 Å Co 43 Ag 57 at HT, ͑g͒ and ͑h͒ 60 Å Co 43 Ag 57 deposited at LT ͑0°C͒, and ͑i͒ and ͑j͒ 380 Å Co 43 Ag 57 at LT. to the Co bulk value over the first 20 Å. 11,12 This is evidence of complete Ag and Co segregation as will be confirmed by x-ray and TEM measurements presented below.…”

Section: Structural Propertiessupporting

confidence: 71%

Correlation between the structural and transport properties of as-grown epitaxial phase-separated Co-Ag thin films

et al. 1996

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Giant magnetoresistive Co-Ag granular films are prepared by molecular beam epitaxy at three different temperatures with cobalt concentrations ranging from 30 to 80 at. %. The structural properties of these films are studied using a variety of diffraction techniques and real space probes. Magnetization and magnetotransport measurements are carried out at room temperature. Correlating the structural and magnetotransport properties reveals that the spin diffusion length strongly affects the amplitude of the giant magnetoresistance, which is otherwise dominated by the surface-to-volume ratio of the segregated magnetic precipitates.

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Section: Structural Propertiessupporting

confidence: 71%

Correlation between the structural and transport properties of as-grown epitaxial phase-separated Co-Ag thin films

et al. 1996

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“…3 It can be understood that the magnetic properties of a particular multilayer system are closely associated with its crystallography and microstructural characteristics, such as quality of buffer layer, thickness of individual layers, structural variation of epitaxial films, interfacial states between individual layers, chemical interaction between the different species, and distribution of stressstrain fields, etc. l'A The magnetic properties, especially the unusual perpendicular magnetic anisotropy exhibited by some of these multilayers, are particularly interesting for magnetic fundamental studies and for applications to recording media in relation to high density magnetic recording.…”

Section: Introductionmentioning

confidence: 99%

Plan-view microstructures of Co/Ru bilayers

et al. 1995

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Plan-view microstructures of two Co/Ru bilayers with a composition of [COI2ARU45A]2 and [CO4OARU35A]2 have been studied by conventional and high resolution electron microscopy. Large differences in electron diffraction and image contrast between the two bilayers were observed, which are recognized as the microstructural variations during the relaxation of large coherent planar strains when the Co layers wet coherently or semicoherently the Ru layers. For the [CO12ARU45A]2 bilayer, the Co layers are unrelaxed from the Ru layers; only one set of electron diffraction patterns was observed, and the image consists of three types of contrasts which are closely related with either the generation and movement of misfit dislocations or large coherent strains. For the [CO4OARU35A]2 bilayer, the Co layers are relaxed basically from the Ru layers; two sets of electron diffraction patterns with double diffraction spots were observed, and the image consists of small irregular areas with moire fringe dots.

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“…These results are in good agreement with RHEED studies. 7,12 Note here that the observed Co-Co bond length is the average over the whole film so that one cannot simply distinguish whether the first ͑bottom͒ layer retains the large in-plane expansion during further film growth. The precise EXAFS analyses for the 2 ML sample show, however, that the difference in the in-plane bond lengths of the first and second layers is rather small, suggesting a structural change in the whole film.…”

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confidence: 99%

“…Distance R (Å ) 12 as-deposited 3 ML Co thin film is relaxed by Ru capping and finally vanishes with 4 MLE-Ru capping. Although the same result was also obtained from the 2 ML sample, the Co-Co bond length is not affected by the Ru capping in the 6 ML sample ͑figures not shown͒.…”

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Perpendicular magnetic anisotropy associated with strain relaxation in Ru/Co/Ru(0001): Anomalous relation of atomic and magnetic structures

et al. 2009

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Atomic structure and magnetic anisotropy of Ru/Co/Ru͑0001͒ were studied by Co K-edge extended x-ray absorption fine structure and Co L III,II -edge x-ray magnetic circular dichroism. The Co/Ru͑0001͒ films exhibit in-plane magnetization in a thickness range of 1-15 ML. The Co film shows a large expansion of the in-plane Co-Co bond length at the initial stage of the growth, leading to a large strain. Upon Ru capping on the Co/Ru͑0001͒ film, the strain is relaxed and a spin reorientation transition ͑SRT͒ occurs from in-plane to out-of-plane magnetization. These results contradict the conventional understanding of magnetic anisotropy in which perpendicular magnetic anisotropy ͑PMA͒ is believed to be enhanced by the strain in the film. The estimation of magnetic anisotropy constants revealed that the SRT is induced by a large PMA at the Co/Ru interface in the Ru capped films, as well as a large in-plane magnetic anisotropy at the vacuum/Co and/or Co/Ru interfaces in the Co bare films.

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Growth of Co/Ru strained superlattices

Cited by 30 publications

References 4 publications

Correlation between the structural and transport properties of as-grown epitaxial phase-separated Co-Ag thin films

Correlation between the structural and transport properties of as-grown epitaxial phase-separated Co-Ag thin films

Plan-view microstructures of Co/Ru bilayers

Perpendicular magnetic anisotropy associated with strain relaxation in Ru/Co/Ru(0001): Anomalous relation of atomic and magnetic structures

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