The effects of metallic underlayers on magnetic properties of obliquely sputtered Co thin films

Nguyen, Long Thang; Lisfi, A.; Lodder, J.C.

doi:10.1016/s0304-8853(01)01163-5

Cited by 12 publications

(6 citation statements)

References 6 publications

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“…The Cr, Cu and Al under-layers with a layer thickness of 137, 143 and 108 nm, respectively, had a small grain size on the surface, but the Co and Ag under-layers with a layer thickness of 69 and 319 nm, respectively, exhibited a bigger grain size. Nguyen et al (2002) reported that Al could induce a microstructure change by isolating the nuclei and reducing their sizes. A similar effect was observed for Cu under-layer on the sputtered Co film grown on a polymer substrate (Nguyen et al, 2002).…”

Section: Resultsmentioning

confidence: 99%

“…Nguyen et al (2002) reported that Al could induce a microstructure change by isolating the nuclei and reducing their sizes. A similar effect was observed for Cu under-layer on the sputtered Co film grown on a polymer substrate (Nguyen et al, 2002). Besides this, a Cu under-layer and Au under-layer could also reduce the ordering temperature of sputtered FePt film (Yang et al, 2011) and FePd film (Li et al, 2013), respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Lee et al (1998) reported that a CrMn alloy improves the magnetic properties of sputtered CoCrPt film compared to the conventional Cr under-layer. Nguyen et al (2002) revealed the effects of a metallic Al under-layer and polymer substrate Doi: 10.12982/cmujns.2014.0066 (PET) on the morphology of the magnetic properties of Co film prepared by s puttering. Moreover, Nguyen and Lodder (2004) investigated the morphology and structure of the Co film on Cu and Cr under-layers and found that the different microstructure and morphology of the under-layers strongly affected the properties of sputtered Co film, and the differences in the morphology of the under-layers resulted in different structures of 20 nm Co film.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Under-layers on Surface Morphology of Sputtered Co Film

Manaviroj¹,

Rattanasakulthong

2014

CMUJNS

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Spiral waves are ubiquitously observed in a variety of physical and biological systems, including superconductors, superfluids, CO-oxidation on platinum surfaces, cell aggregation of slime mold and arrhythmia in cardiac tissues. Such spiral waves are uniquely explained by a reaction-diffusion mechanism. Due to easy preparation and convenient detection, the excitable chemical Belousov-Zhabotinsky (BZ) reaction is employed to study spiral waves in experiments. We studied the influence of initial concentration of H 2 SO 4 ([H 2 SO 4 ]) on the dynamics of spiral waves in a thin layer of the BZ reaction with pyrogallol. This reaction has an advantage over the classical BZ reaction with malonic acid, as it is bubble-free. We found that the spiral tip, i.e., the organizing center, moved along so-called meandering trajectories with three or four outward petals. In addition, the area occupied by the spiral tip decreased when [H 2 SO 4 ] was increased. We further investigated the dynamics far from the organizing center by measuring properties of propagating fronts. An increase of [H 2 SO 4 ] resulted in a simultaneous decrease of the wavelength and wave period. In contrast, the wave speed grew with [H 2 SO 4 ]. Since disturbances by the byproduct CO 2 bubbles are avoided and the wave velocity is sufficiently low, the results present a suitable guideline for further investigations on propagating excitation waves in two-and three-dimensional excitable media, especially observations of wave instabilities in three-dimensional systems using optical tomography.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Under-layers on Surface Morphology of Sputtered Co Film

Manaviroj¹,

Rattanasakulthong

2014

CMUJNS

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“…The methods employed to produce these composites are diverse and include screen-printing, molding, wet-etching and squeegee-coating techniques (Delille et al, 2006;Lagorce and Allen, 1997;Wang et al, 2004). Alternative techniques include electroplating and bonding of ferromagnetic materials to polymer films (Takeuchi et al, 2004), ion beam implantation of ferromagnetic ions into polymers (Petukhov et al, 2007), and sputtering of magnetic particles onto polymer substrates (Nguyen et al, 2001;Oka et al, 1995). Future work to miniaturize the current prototype system will involve a critical analysis of microfabrication techniques, their advantages, and potential limitations.…”

Section: Discussionmentioning

confidence: 99%

Magnetic insertion system for flexible electrode implantation

Jaroch

Ward²,

Chow³

et al. 2009

Journal of Neuroscience Methods

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“…Cobalt based compounds are also popular for magnetic recording media because of their higher recording density and higher coercivity [3]. The magnetization process of Co thin films, multilayer with other noble metals, submicron sized particles, and their patterned structures have been the subject of extensive investigations as they are both promising for industrial applications and important for understanding the fundamental aspects of surface magnetism [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Magnetic Domain Studies of Cobalt Nanostructures

Nagaraja

Rossignol

et al. 2012

J Supercond Nov Magn

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International audienceThe pulsed laser deposition technique associated with a low energy cluster beam is used to deposit cobalt thin films with a thickness 100-200 nm and cobalt dots of a diameter 100-200 nm on silicon substrates. The deposited thin films of Co are composed of clusters of a size 10- 50 nm, with very few large grains as revealed by atomic force microscopy. The observations performed by magnetic force microscopy on as-grown thin films reveal randomly distributed out-of-plane magnetic domain structures. These magnetic domains are aligned linearly by applying an external magnetic field either perpendicular or parallel to the substrate during the deposition. In addition, the effect of film thickness and roughness on multidomains is reported. The increase of roughness resulted in the decrease of magnetic domain width from 200 to 100 nm. This decrease is accompanied by the appearance of instability in the stripe domain pattern. Well separated cobalt dots of diameter in the range of 100-200 nm are also deposited on silicon substrates, which show arc-like multidomains. The domains seem to be oriented along the long axis of the dots. The domain structure of Co nanodots is similar to that of Co thin films indicating strong magnetic coupling of clusters

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The effects of metallic underlayers on magnetic properties of obliquely sputtered Co thin films

Cited by 12 publications

References 6 publications

Effects of Under-layers on Surface Morphology of Sputtered Co Film

Effects of Under-layers on Surface Morphology of Sputtered Co Film

Magnetic insertion system for flexible electrode implantation

Magnetic Domain Studies of Cobalt Nanostructures

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