Down the “Memory” lane, it was from Selectron tube to RAM and now SRAM, which is in use! In a four transistor memory, upto millions of atoms are involved on typical today’s disk drives to just store a single bit of information. IBM has come up from its R&D scientists’ research by demonstrating a atomic limits of magnetic memory that it just requires only 12 magnetic atoms to hold one single BIT of data. Using anti-ferromagnets under low temperatures, the state of atom can be stored for hours i.e. without getting effected by neighboring magnetic fields. Anti-ferromagnets are used along with Scanning tunneling Microscopes (STMs). An STM was also an invention by IBM researchers in 1981 and won them a Nobel prize for STM invention. By changing magnetic spin polarities at nanosecond speed at STM tip switches with current flowing from 0 to 1 or viceversa, to just form a bit of data and thus can be further adjusted to form the byte of desired data. Further research can bring this to realtime application!
This accounts to a storage that is 100x times more denser than today’s memory storage devices. Moore’s law: “The number of transistors will double on s single Microchip every two years. Technology pacing up to Moore’s law, faithfully!