1. Racetrack Magnetic Memory DebasisSadhukhan M.Sc. Physics Dept. of Physics IIT Bombay

2. Classification of MemoryMagnetic harddiskdrives(HDD)Solid State Memory

3. Magnetic Hard drives relies on the mechanical rotation of a disk • Energy consuming • Slow The Disadvantages

4. Solve the problem with HDD. But…… • 100 times faster. • But Costly. • lose their data when the computer powers down or crashes Solid State Memory Devices

5. Scaling devices in two dimension getting Saturated. • One day, it will not work any further. • We need to find alternative way. Expectation

6. Why it is called Racetrack? • Racetrack because we are going to have magnetic nanowires that will contain magnetic domain like little race cars. • We are going to move the race cars (i.e. the magnetic domains) up and down which stand above a silicon wafer Racetrack Memomry may bring a solution

7. We need to put the information bit i.e. 0,1 in to the nanowire. • The magnetic domain can be Spin Up or Spin Down. • Let’s say, Up represents 0 and Down presented 1. The Information bit

8. Manipulating Magnetic Domain

9. By flowing the current of spin-polarized electrons i.e. spin angular moments, we can manipulate the magnetic domain in a racetrack. • That is how we are going to shift information in the nanowires using nanosecond long pulses of spin-polarized currents. Manipulating Magnetic Domain

11. The currents will keep arise into a torque in each of the domain walls and cause them to move all in same direction. • That how we have produced a moving three dimensional memory without any energy loss. The key idea

12. We bring the information down in the surface of Silicon wafer, where we have all means of deleting and writing information into the nanowires. • After writing, we raise the information in the top (away from the Si wafer surface) Mechanism

13. That is how it works

14. Each racetrack, having single reading and writing devices, gives us the opportunity to store multiple bits of information • With no moving part, • No moving atoms & • No moving cost. Application

15. If the Racetrack Memory is successful, then it is going to replace the diskdrives and some of the conventional memory ( in fact most of them). • We can build a computer that are more compact, consume much less energy and will be slightly useful than our current computer. • This can change not only the memory industry but bring a revolution to computation industry Application

16. Thank You