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Memristor

Brief discussion on memristor

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Memristor

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  1. Course: Electron Device Arpan Deyasi Electron Memristor Device Arpan Deyasi RCCIIT, Kolkata 17-08-2021 Arpan Deyasi, India 1

  2. What is Memristor? Two terminal passive electrical component Arpan Deyasi Memorize the charge flow by changing resistance Electron Device Memristor = Memory + Resistor 17-08-2021 Arpan Deyasi, India 2

  3. What is Memristor? It is a semiconductor where resistance varies as a function of flux and charge Arpan Deyasi This allows it to remember what has allows to pass through it Electron Retain the resistance level even after switch off the power Device 17-08-2021 Arpan Deyasi, India 3

  4. Relationship between fundamental physical parameters Arpan Deyasi Resistor Voltage Current = v iR Electron  d dq dt = v = i Capacitor Inductor dt Device =  = q Cv Li  = Mq ? Flux Charge ? Memristor 17-08-2021 Arpan Deyasi, India 4

  5. What is Memristance? Charge-dependent resistance Arpan Deyasi Electron = ( ) ( ) ( ) M q I t V t Device  d where = ( ) M q M dq 17-08-2021 Arpan Deyasi, India 5

  6. Relationships Mq Arpan Deyasi  = = Electron d dq dt M dt Mi Device = v = 2 P Mi 17-08-2021 Arpan Deyasi, India 6

  7. Contact 1 Arpan Deyasi TiO2 (doped) TiO2 Contact 2 (undoped) Working Principle Contact 1 Electron TiO2 (doped) TiO2 Contact 2 (undoped) Device Contact 1 TiO2 (doped) TiO2 Contact 2 (undoped) 17-08-2021 Arpan Deyasi, India 7

  8. Working Principle Titanium Dioxide Memristor is a solid state device that uses nano scale thin-films to produce a Memristor. Arpan Deyasi The device consists of a thin titanium dioxide film (50nm) in between two electrodes (5nm) one Titanium and the other Platinum. Electron Initially, there are two layers to the titanium dioxide film, one of which has a slight depletion of oxygen atoms. Device 17-08-2021 Arpan Deyasi, India 8

  9. Working Principle The oxygen vacancies act as charge carriers and this implies that the depleted layer has a much lower resistance than the no depleted layer. Arpan Deyasi Electron When an electric field is applied, the oxygen vacancies drift, changing the boundary between the high-resistance and low-resistance layers. Device Thus the resistance of the film as a whole is dependent on how much charge has been passed through it in a particular direction, which is reversible by Changing the direction of current. 17-08-2021 Arpan Deyasi, India 9

  10. Hysteresis Effect Arpan Deyasi Consider one TiO2semiconductor with one side doped Electron Therefore application of bias will push the carriers from doped to undoped region, causes lowering Device I of resistance Bias in reverse direction again increases the resistance V 17-08-2021 Arpan Deyasi, India 10

  11. Characteristics of Memristor Combination of hard-disk and RAM Arpan Deyasi Eliminates delay Electron Speed is inversely proportional to size Device Non-volatile memory Analog data storage possible 17-08-2021 Arpan Deyasi, India 11

  12. Characteristics of Memristor Uses anything between ‘0’ and ‘1’ Arpan Deyasi Compatible with CMOS interfaces Electron Faster than flash memory Device Larger packing density Less power consumption 17-08-2021 Arpan Deyasi, India 12

  13. Why Memristor? Arpan Deyasi Today, most computers use random access memory (RAM), which moves very quickly as a user works but does not retain unsaved data if power is lost. Electron Flash drives, on the other hand, store information when they are not powered but work much slower. Device Memristors could provide a memory that is the best of both worlds: fast and reliable. 17-08-2021 Arpan Deyasi, India 13

  14. Types of Memristor • Spintronic Memristor Arpan Deyasi • Spin Torque Transfer Magneto resistance Electron • Titanium dioxide memristor Device • Polymeric memristor • Spin memristive systems • Magnetite memristive systems • Resonant tunnelling diode memristor 17-08-2021 Arpan Deyasi, India 14

  15. Advantages of Memristor Comparable quicker boot-up Arpan Deyasi Less power dissipation Electron Eliminates the need to write computer programs that replicate small parts of brain Device Better information storage owing to higher packing density Insignificant power consumption at idle conditions as it is non-volatile memory Greater reliability and resiliency when power is interrupted at data centers 17-08-2021 Arpan Deyasi, India 15

  16. Applications of Memristor Analog Computations Arpan Deyasi Programmable logic and signal processing Electron Circuits with mimic neuromorphic and biological systems Device Artificial intelligence 17-08-2021 Arpan Deyasi, India 16

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