Skip to main content

Crystallization of Cobalt Amorphous Alloys Under Field Annealing

Buy Article:

$113.00 plus tax (Refund Policy)


Crystallization of Co-rich amorphous ribbons annealed under a 10 Oe external magnetic field at the early 30 minutes from their glassy status to supercooled liquid status is investigated by high-resolution transmission microscope (HR-TEM), Selected Area Fourier Transform (SA-FT), X-ray diffraction (XRD) and differential scanning calorimetry (DSC). Results indicate that the short-rang ordering feature can be refined very well in specimen annealed under temperatures about 87.4 °C below their glass transition (T g), showing refined salt-pepper morphologies with a mean length changing from 1.2±0.8 nm to 0.8±0.2 nm and a mean width shifting from 0.5±0.2 nm to 0.3±0.1 nm. When the amorphous ribbons are field-annealed at temperature near to T g (i.e., 450 °C), ultra-fine nanocrystalline structures can be formed on the top surface of ribbons with size of 3.5±0.5 nm and inter-grain spacing of about 0.4±0.2 nm even though the inner parts of the ribbons are still in amorphous phases. The nanocrystalline areas are featured by the formation of doped hcp cobalt phase orientated along the c-axis, with the inter-plane spacing ranging from 4 Å to 6 Å. When the annealing temperature is above T g, the grain sizes are increased dramatically with multi-phased nanocrystals precipitating from the amorphous substrate, and finally reaching almost complete crystallization at 600 °C, causing greatly coarsening of the nanocrystal structures.


Document Type: Research Article


Publication date: February 1, 2012

More about this publication?
  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
  • Editorial Board
  • Information for Authors
  • Subscribe to this Title
  • Terms & Conditions
  • Ingenta Connect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more