The following operators can be used to better focus your queries.
( ) , AND, OR, NOT, W/#
? single char wildcard, not at start
* multi char wildcard, not at start
(Cat? OR feline) AND NOT dog?
Cat? W/5 behavior
(Cat? OR feline) AND traits
Cat AND charact*
This guide provides a more detailed description of the syntax that is supported along with examples.
This search box also supports the look-up of an IP.com Digital Signature (also referred to as Fingerprint); enter the 72-, 48-, or 32-character code to retrieve details of the associated file or submission.
Concept Search - What can I type?
For a concept search, you can enter phrases, sentences, or full paragraphs in English. For example, copy and paste the abstract of a patent application or paragraphs from an article.
Concept search eliminates the need for complex Boolean syntax to inform retrieval. Our Semantic Gist engine uses advanced cognitive semantic analysis to extract the meaning of data. This reduces the chances of missing valuable information, that may result from traditional keyword searching.
A thin layer, 5 to 10 nm in thickness, of zirconium or hafnium, sandwiched between the magnetic CoP layer and the overcoat, significantly improves the corrosion resistance of the thin film disk.
English (United States)
This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately
65% of the total text.
Page 1 of 2
METALLIC OVERLAYER FOR CoP PROTECTION IN THIN FILM DISKS
A thin layer, 5 to 10 nm in thickness, of zirconium or hafnium, sandwiched
between the magnetic CoP layer and the overcoat, significantly improves the
corrosion resistance of the thin film disk.
Although metallic cobalt and CoP can form several oxides, they are not
particularly protective and in most natural environments cobalt readily corrodes.
Moreover, in a typical disk structure, CoP is covered by a thin layer of C
(deposited by RF or DC sputtering to provide desired mechanical properties)
which is conductive and accelerates CoP corrosion through a galvanic attack at
sites of incomplete coverage. Thus, there is a concern about disk's stability in
storage as well as in files, which are not hermetically sealed and which operate
at humidities above 30 percent.
Thin film interlayers of zirconium or hafnium for enhanced disk corrosion
resistance were selected after carefully screening several factors. The interlayer
has to be thin and any metal more noble than CoP could cause local galvanic
attack of the unprotected area. Thus, among many thin films of metals known to
passivate [*] and examined by electrochemical tests in DI water, advantage is
given to zirconium, hafnium, aluminum and vanadium. They show low corrosion
rates, and corrosion potentials lower than that of CoP. The preference is given to
Zr and Hf because they protect not only against water but also against more
acidic pollutants (Cl2, H2S, SO2,...