Spintronics presentation
- 1. Submitted To: Mr.S.PAGARWAL (HODDeptt. OfEX) Submitted by: Ravisha Shringi 12EMHEX020
- 2. WHAT IS SPINTRONICS WHY SPINTRONICS BASIC PRINCIPLE ADVANTAGES GIANT MAGNETO RESISTANCE(GMR) TUNNEL MAGNETORESISTANCE ELECTRONICS V/S SPINTRONICS APPLICATIONS
- 3. Conventional electronic devices ignore the spin property and rely strictly on the transport of the electrical charge of electrons. Adding the spin degree of freedom provides new effects, new capabilities and new functionalities
- 4. Spintronics is a blend of electronics with spin. It refers to the study of the role played by the electron spin in solid state physics and possible devices that specifically exploits spin properties of electrons instead of it’s charge. It promises new logic devices which enhances functionality, high speed and
- 5. Moore’s law -states that the number of transistors on a silicon chip will roughly double every eighteen months. By 2008, it is projected that the width of the electrodes in a microprocessor will be 45nm across As electronic devices become smaller, quantum properties of the wavelike nature of electrons are no longer negligible. Spintronic devices offer the possibility of enhanced functionality, higher speed, and reduced power consumption.
- 6. In Spintronics , information is carried by orientation of spin rather than charge. Spin can assume one of the two states relative to the magnetic field, called spin up or spin down. These states, spin up or spin down, can be used to represent ‘1’ and ‘0’ in binary logic. In certain spintronic materials, spin orientation can be used as spintronic memory as these orientation do not change when system is switched off.
- 7. Low power consumption. Less heat dissipation. Spintronic memory is non-volatile. Takes up lesser space on chip, thus more compact. Spin manipulation is faster , so greater read & write speed. Spintronics does not require unique and specialized semiconductors. Common metals such as Fe, Al, Ag , etc. can be used.
- 8. The basic GMR device consists of a layer of non - magnetic metal between two magnetic layers. A current consisting of spin-up and spin-down electrons is passed through the layers. Those oriented in the same direction as the electron spins in a magnetic layer pass through quite easily while those oriented in the opposite direction are scattered.
- 9. Magnetic tunnel junction has two magnetic layers separated by an insulating metal-oxide layer. Is similar to a GMR spin valve except that a very thin insulator layer is sandwiched between magnetic layers instead of metal layer. The difference in resistance between the spin-aligned and nonaligned cases is much greater than for GMR device infact 1000 times higher than the standard spin valve.
- 10. One of the main advantage of spintronics over electronics is the magnets tend to stay magnetize which is sparking in the industry an interest for replacing semiconductor based components with magnetic ones, starting with the RAM. With an all-magnetic RAM, it is now possible to have a computer that retains all the information put into it. Most importantly, there will be no “boot-up” waiting period when power is turned on.
- 11. Another promising feature of spintronics is that it doesn’t require the use of unique and specialized semiconductor, there by allowing it to work with common metals like Cu, Al, Ag. Spintronics will use less power than conventional electronics, because the energy needed to change spin is a minute fraction of what is needed to push charge around.
- 12. The Magnetic version of RAM used in computer is nonvolatile. Other advantages of include small size, lower cost, faster speed and less power consumption, robust in extreme condition such as high temperature, high level radiation and interference.
- 13. Spin property of electrons are yet to mastered. Researcher and scientist are taking keen interest. Span of last two decade major milestones. It holds vast opportunities for physics , material & device engineering & technology.
- 15. Thank you!!!