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. 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.

4. 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.

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

6. 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.

7. 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

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

9. 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.

10. Applications

11. 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.

12. 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.

13. 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.

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

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

16. 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.

17. 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.

18. 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