Structure and magnetic properties of sputtered FCC Co(111) films grown on a glass substrate

B, Gu; Wang, H.

doi:10.1016/s0304-8853(97)01034-2

Cited by 22 publications

(2 citation statements)

References 9 publications

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“…44 The cobalt nanoparticles can crystallize into fcc, hcp, and εphases. 45,46 We first establish that our X-ray PDF experimental setup is sensitive enough to distinguish between those different phases by measuring reference bulk powders. Our first reference sample is a powder bulk of hcp Co.…”

Section: Tem Image Of As-synthesized Co Nanoparticles (Sample Co-1)mentioning

confidence: 99%

Implications of Room Temperature Oxidation on Crystal Structure and Exchange Bias Effect in Co/CoO Nanoparticles

et al. 2015

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We describe here how the exchange bias effect in Co/CoO nanoparticles depends on the size focusing and temperature treatment of precursor Co nanoparticles before oxidation at ambient conditions. By appealing to magnetization, microscopy, neutron, and synchrotron X-ray measurements, we found that as-synthesized Co nanoparticles readily oxidize in air only after 20 days. The highest exchange bias field of 814 Oe is observed at T = 2 K. When the same nanoparticles are centrifuged and annealed at 70 °C under vacuum prior to oxidation, the exchange bias field is increased to 2570 Oe. Annealing of Co nanoparticles in vacuum improves their crystallinity and prevents complete oxidation, so that Co-core/CoO-shell structure is preserved even after 120 days. The crystal structure of CoO shell in both samples is different from its bulk counterpart. Implications of such distorted CoO shells on exchange bias are discussed. Coating of Co nanoparticles with amorphous silica shell makes them resistant to oxidation but ultimately modifies the crystal structure of both Co core and SiO 2 shell.

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Section: Tem Image Of As-synthesized Co Nanoparticles (Sample Co-1)mentioning

confidence: 99%

Implications of Room Temperature Oxidation on Crystal Structure and Exchange Bias Effect in Co/CoO Nanoparticles

et al. 2015

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“…Furthermore, antibacterial coatings with thin cobalt films [8] or the application as catalyst nanoparticles for the growth of carbon nanotubes [9] are of interest. Such thin films are generated using different techniques including sputtering [10], electron beam evaporation [11,12], ALD (Atomic Layer Deposition) [13][14][15][16][17][18][19] and (MO)CVD (metal-organic chemical vapor deposition) [20][21][22][23]. Within the latter deposition technique, it could be shown that this process is capable of forming uniform cobalt films in a highly controlled manner .…”

Section: Introductionmentioning

confidence: 99%

Half-sandwich cobalt complexes in the metal-organic chemical vapor deposition process

et al. 2015

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Structural Characterization of Cobalt Thin Films Grown by Metal-Organic CVD

Chioncel

Haycock

2005

Chem. Vap. Deposition

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Cobalt thin films were produced by metal-organic CVD from C 5 H 5 Co(CO) 2 , at various temperatures and for various deposition times. The films have been grown onto glass substrates with no buffer. The crystalline structure, morphology, and composition of the films were analyzed by X-ray diffractometry (XRD), field-emission scanning electron microscopy (FESEM), atomic force microscopy (AFM), and Auger electron spectroscopy (AES). Routine XRD patterns were collected in symmetric geometry for phase identification and the sin 2 w diffraction technique was employed to calculate the average in-plane stress. Structural studies indicate that the films tend to grow in island mode, as predicted by theory, and have a structure between that of face-centered cubic (fcc) and hexagonal close-packed (hcp) cobalt. There is significant in-plane tensile stress at the interface with the substrate, which relaxes to a compressive stress an order of magnitude lower at the surface. The films have a relatively low impurity content, as determined by AES, except near the surface.

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Structure and magnetic properties of sputtered FCC Co(111) films grown on a glass substrate

Cited by 22 publications

References 9 publications

Implications of Room Temperature Oxidation on Crystal Structure and Exchange Bias Effect in Co/CoO Nanoparticles

Implications of Room Temperature Oxidation on Crystal Structure and Exchange Bias Effect in Co/CoO Nanoparticles

Half-sandwich cobalt complexes in the metal-organic chemical vapor deposition process

Structural Characterization of Cobalt Thin Films Grown by Metal-Organic CVD

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