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 very high information storage density is obtained by using a focussed ion beam to amorphize small regions of Si or Ge.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
61% of the total text.
Page 1 of 1
Storage of Information by Heavy Ion Irradiation of Si or Ge
A very high information storage density is obtained by using a focussed ion
beam to amorphize small regions of Si or Ge.
Krohn et al [l] have used a field-ionization gallium source to illuminate an area
of 140 angstroms diameter with 4 x 10/8/ atoms per second.
A realistic possibility for storage of information with high density is stable
amorphization of Si or Ge. With a 10 keV ion beam, individual damage cascades
will have diameters less than 100 angstroms. Assuming the wafer to be divided
in lattice points with a distance of 340 angstroms, a storage density of 3 x 10/11/
bits/cm/2/ is obtained.
The total area of the semiconductor defined by the beam will be amorphized
by the impact of ~10 ions. However, this is not necessary since it should be
possible to detect individual damage cascades.
The average number of ions necessary per information point must be
determined by statistical considerations. The number of ions arriving within the
writing time will be governed by the Poisson distribution. Assuming that arrival of
at least two atoms will be necessary to guarantee storage, the average number
of atoms per a number of storage points a, is given as the solution to e/-a/ (1+a)
= p(not writing). where P is the accepted probability of nonwriting. a=20 will
ensure P<10/-7/, which might be acceptable. This number gives a writing of >10
Reading may be achieved using an electron beam of similar s...