Carbon nanotubes have found another application. A few days ago, Nature Scientific Reports published an article that, for the first time, explored the possibility of using multiwall carbon nanotubes (MWCNTs) in magnetic recording on hard drives. These are a variety of complex CNT structures in the form of "matryoshka dolls," "rolls," and other designs. The goal in all cases boils down to one thing: stuffing each such complex carbon nanotube with magnetic nanoparticles. Individual magnetic nanoparticles will not produce any data recording effect. Only the magnetization of the entire tube can be changed, but this will still be more dense than recording a magnetic field. domain on a regular HDD magnetic platter. Much denser.
The study of magnetic recording on MWCNT was conducted by scientists from the University of Alaska (Fairbanks) and a number of other scientific institutions in the USA and Czech RepublicCzech scientist Gunther Kletetschka is one of the project's leaders. He notes that existing methods for increasing the recording density of hard disk drives (HDDs) are no longer keeping pace with the rate of data growth. To curb data growth, hard disk storage density must increase by 40% annually, and in recent years, it has been growing at 10-15% per year. Carbon magnetic tube recording may be the answer to the challenges of the information age, but a tremendous amount of research remains 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
