Spintronics

The developing technology, the future, a tech that can replace the electronics era itself.
Few information about the tech and the fundamentals of Spintronics.

1. spintronics Akshay Krishna KR Roll No.03 S5 ECE2

2. Introduction The study of the intrinsic spin of the electron and its associated magnetic moment, in addition to its fundamental electronic charge, in solid-state devices.

3. Spintronics In addition to charge state, electron spins are exploited as a further degree of freedom, with implications in the efficiency of data storage and transfer. Spintronic systems are most often realised in dilute magnetic semiconductors (DMS) and Heusler alloys . Particular interest in the field of quantum computing .

4. Details Utilizes the Bizarre property of spin of electron. Intrinsic angular momentum is Spin. Two arbitrary orientations and its magnitudes are ±ħ/2.

5. Details Directional and coherent motion of electron spin circulates a spin current, which will carry or transport information and control quantum spin in a spintronic device. Superconductors can enhance central effects in spintronics such as magnetoresistance effects, spin lifetimes and dissipationless spin-currents .

6. Why Spintronics ? Electronics Spintronics Power Faliure Problem “Boot Up” Waiting Problem More Power Consumption Less Compact Normal Speed Cheaper No Power Faliure No “Boot Up” Waiting Problem Less Power Consumption More Compact Faster Transfer Costlier

7. Advantages Faster Transfer No “Boot Up” Waiting Problem Less Power Consumption More Compact

8. Spintronic Devices Working All spintronic devices act according to the simple scheme : Information is stored(written) into spins as a particular spin orientation(up or down). The spin being attached to mobile electrons, carry the information along a wire. The information is read at a terminal.

9. Applications

10. Applications - Spintronic Devices Spintronic -logic devices Non-volatile spin-logic devices to enable scaling are being extensively studied. Spin-transfer, torque-based logic devices that use spins and magnets for information processing have been proposed. These devices are part of the ITRS exploratory road map.

11. Spintronic Devices Spintronic -logic devices Logic-in memory applications are already in the development stage. Read heads of magnetic hard drives are based on the GMR or TMR effect. Magnetic sensors can use the GMR effect.

12. Spintronic Devices Metal-Based Devices Tunnel magnetoresistance (TMR), where CPP transport is achieved by using quantum-mechanical tunneling of electrons through a thin insulator separating ferromagnetic layers. Spin-transfer torque, where a current of spin-polarized electrons is used to control the magnetization direction of ferromagnetic electrodes in the device.

13. Spintronic Devices Metal-Based Devices Spin-wave logic devices carry information in the phase. Interference and spin-wave scattering can perform logic operations.

14. Spintronic Devices Two spin devices have been fabricated in industries. They are: GMR [Giant Magneto Resistance] MTJ [Magnetic Tunnel Junction]

15. Applications - Storage media Antiferromagnetic storage media have been studied as an alternative to ferromagnetism, especially since with antiferromagnetic material the bits can be stored as well as with ferromagnetic material.

16. Conclusion Advantages of spintronic devices over the present electronic devices. It replaces the present electronics era and provides high speed, huge size, compactness so on. GMR is the base to switch from electronics to spintronics . The magnetic field of the earth may affect the magnetic field inside the spin devices and cause errors.

17. Reference https://en.wikipedia.org/wiki/Spintronics - Wikipedia Wolf, S. A.; Chtchelkanova , A. Y.; Treger , D. M. (2006). " Spintronics —A retrospective and perspective". IBM Journal of Research and Development. Spintronics : A Spin-Based Electronics Vision for the Future- Sciencemag.org

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