Racetrack Magnetic Memory

Debasis SadhukhanM.Sc. PhysicsDept. of PhysicsIIT BombayRacetrack Magnetic MemoryClassification of Memory

Magnetic harddiskdrives(HDD)

Solid State Memory

The DisadvantagesMagnetic Hard drives relies on the mechanical rotation of a diskEnergy consumingSlowSolid State Memory DevicesSolve the problem with HDD.But100 times faster.But Costly.lose their data when the computer powers down or crashes

ExpectationScaling devices in two dimension getting Saturated.

One day, it will not work any further.

We need to find alternative way.

Racetrack Memomry may bring a solutionWhy 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 waferThe Information bitWe need to put the information bit i.e. 0,1 in to the nanowire.The magnetic domain can be Spin Up or Spin Down.Lets say, Up represents 0 and Down presented 1.Manipulating Magnetic Domain

Manipulating Magnetic DomainBy 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.

The key ideaThe 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.MechanismWe 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)

That is how it works

ApplicationEach 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.

ApplicationIf 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 industryThank You