Carbon nanotubes have found another application. A few days ago, an article was published in the journal Nature Scientific Reports, which for the first time considers the possibility of using multiwall carbon nanotubes (MWCNT) in magnetic recording on hard disks. These are various complex CNT-structures in the form of "matryoshka", "convolutions" and other structures. The task in all cases is reduced to one thing - to stuff each such complex carbon nanotube with magnetic nanoparticles. Each magnetic nanoparticle separately will not give the effect of data recording. You can only change the magnetization of a whole tube, but it will still be denser than writing a magnetic domain on a conventional HDD magnetic plate. Many times tighter.
The study of magnetic recording on MWCNT was carried out by scientists from the University of Alaska (Fairbanks) and a number of other scientific institutions in the USA and the Czech Republic. One of the project leaders was the Czech scientist Gunther Kletetschka. The specialist notes that the existing methods for increasing the recording density on HDD magnetic disks no longer correspond to the data growth rate. To curb the growth of data, it is necessary that the density of data storage on hard drives grow by 40% every year, and in recent years it has been growing by 10-15% per year. Recording using carbon magnetic tubes can be a response to the challenges of information time, but for this there is still a lot of research work to be done.
The essence of the discovery is that carbon nanotubes with magnetic nanoparticles inside were exposed to an electromagnetic field of different amplitudes and different frequencies. The manufacture of carbon tubes stuffed with nanoparticles, by the way, was carried out using deposition in a gaseous medium - nothing new. When applying a magnetic field with a frequency of up to 10 kHz, nothing happened (the surface effect of the conductivity of carbon nanotubes affected), but with an increase in frequency above 10 kHz and a decrease in the field amplitude, the effect of magnetization of a carbon nanotube with magnetic nanoparticles appeared. According to scientists, the external field came into line with the magnetic field of individual particles, which made it possible to give the nanotube a stable magnetization in a given direction.
Scientists do not yet have proposals on how and how to create writing and reading mechanisms for writing data on an array of carbon nanotubes, but they promise to work well in this direction, because over time there will be no less data.
Source: 3dnews.ru