Growth and micromagnetism of self-assembled epitaxial fcc(111) cobalt dots

Fruchart, Olivier; Masseboeuf, Aurélien; Toussaint, Jean-Christophe; Bayle–Guillemaud, Pascale

doi:10.1088/0953-8984/25/49/496002

Cited by 2 publications

(2 citation statements)

References 68 publications

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“…Along with this, hydrogen co-deposition also affects the free surface energies of different crystallographic planes. 42,43 Our previous report shows that there is growth of less dense prismatic (10 10) and (11 20) hcp planes at 50 • C at bath pH value of 4.5 with cobalt concentration of 25 mM. The growth is then changed to that of basal (0002) hcp planes at 60 • C. 22 The formation of less dense planes at 50 • C was due to lowering of their surface energy to more extent, by higher amount of hydrogen adsorption on cathode.…”

Section: Deposition Mechanism-based On Intermediates Formation-mentioning

confidence: 99%

Hydrogen Co-Deposition Induced Phase and Microstructure Evolution of Cobalt Nanowires Electrodeposited in Acidic Baths

Kaur¹,

Pandya²

2016

J. Electrochem. Soc.

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The growth and deposition mechanism of electrodeposited cobalt nanowires (NWs) at different bath temperatures (25°C–60°C) in strongly acidic bath (pH of 2.0) is studied. CV scans show that hydrogen co-deposition is most pronounced in 50°C bath. X-ray diffraction patterns of Co NWs show that a mixture of hcp and fcc phases grows at 25°C, (200) textured fcc-Co phase grows at 50°C, and (10true1̄0) and (11true2̄0) textured hcp-Co phase at 60°C, with these planes normal to the NW-axis. The magnetic properties studied by vibrating sample magnetometer show the change in coercivity, saturation field and magnetization reversal behavior is consistent with the phase of NW. Nucleation mechanism is explained on the basis of intermediates formation induced by the extent of hydrogen co-deposition leading to the change in nucleation overpotential and linked selection of the growth plane as per bath pH and temperature. Chronoamperometry study has confirmed the instantaneous and progressive growth mechanisms operative at 50°C and 60°C respectively and hydrogen co-deposition controlled grain size growth model is also put forth to understand the growth kinetics of fcc and hcp phase Co NWs. The suggested growth mechanism also consistently explains the growth in less acidic bath of pH 4.5.

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Section: Deposition Mechanism-based On Intermediates Formation-mentioning

confidence: 99%

Hydrogen Co-Deposition Induced Phase and Microstructure Evolution of Cobalt Nanowires Electrodeposited in Acidic Baths

Kaur¹,

Pandya²

2016

J. Electrochem. Soc.

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“…where d is the film thickness of 50 nm. According to Fruchart et al, [34] c 101 is 1.06 times c 111 . Therefore, P surf = 6.5 MPa.…”

Section: Discussionmentioning

confidence: 98%

Effects of Film Stress and Geometry on Texture Evolution Before and After the Martensitic Transformation in a Nanocrystalline Co Thin Film

Lee

Kim

et al. 2015

Metall Mater Trans A

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Using a transmission electron microscopy-based orientation and phase mapping technique we examine effects of film stress and geometry on texture development before and after the martensitic transformation in a nanocrystalline Co thin film. Specimens are annealed for various times at 873 K (600°C), which is above the equilibrium martensitic transformation temperature [~693 K (~420°C)], and then cooled to room temperature. The cooled specimens are used for texture analysis. The martensitic transformation is observed to be incomplete, and fcc and hcp structures coexist in all the specimens examined. It is deduced from the crystallographic orientation relationship of the martensitic transformation of Co that, during prolonged annealing at 873 K (600°C), the major texture in the fcc phase is {101}, followed by {111}. In the cooled structure, the major texture component in the hcp phase is (0001), followed by {2110}. The {101} texture is clarified by assuming that the film system is perfect elastic-plastic with the help of the concept of the Taylor factor. We conclude that the (0001) texture is produced by the surface energy minimization, which, however, does not elucidate the development of the {2110} texture. The formation of the texture component is understood by considering the strain energy provided by a constraint imposed by neighboring grains. As annealing time increases, the hcp phase expands its area, dominating over the fcc phase after prolonged annealing, which is also clarified by allowing for the geometrical constraint effect. The expansion of the hcp phase supports the possibility of surface nucleation of martensites.

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Growth and micromagnetism of self-assembled epitaxial fcc(111) cobalt dots

Cited by 2 publications

References 68 publications

Hydrogen Co-Deposition Induced Phase and Microstructure Evolution of Cobalt Nanowires Electrodeposited in Acidic Baths

Hydrogen Co-Deposition Induced Phase and Microstructure Evolution of Cobalt Nanowires Electrodeposited in Acidic Baths

Effects of Film Stress and Geometry on Texture Evolution Before and After the Martensitic Transformation in a Nanocrystalline Co Thin Film

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