This book highlights the overview of Spintronics, including What is
Spintronics ?; Why Do We Need Spintronics ?; Comparative
merit-demerit of Spintronics and Electronics ; Research Efforts put
on Spintronics ; Quantum Mechanics of Spin; Dynamics of magnetic
moments : Landau-Lifshitz-Gilbert Equation; Spin-Dependent Band Gap
in Ferromagnetic Materials; Functionality of 'Spin' in Spintronics;
Different Branches of Spintronics etc. Some important notions on
basic elements of Spintronics are discussed here, such as - Spin
Polarization, Spin Filter Effect, Spin Generation and Injection,
Spin Accumulation, Different kinds of Spin Relaxation Phenomena,
Spin Valve, Spin Extraction, Spin Hall Effect, Spin Seebeck Effect,
Spin Current Measurement Mechanism, Magnetoresistance and its
different kinds etc. Concept of Giant Magnetoresistance (GMR),
different types of GMR, qualitative and quantitative explanation of
GMR employing Resistor Network Theory are presented here.
Tunnelling Magnetoresistance (TMR), Magnetic Junctions, Effect of
various parameters on TMR, Measurement of spin relaxation length
and time in the spacer layer are covered here. This book highlights
the concept of Spin Transfer Torque (STT), STT in Ferromagnetic
Layer Structures, STT driven Magnetization Dynamics, STT in
Magnetic Multilayer Nanopillar etc. This book also sheds light on
Magnetic Domain Wall (MDW) Motion, Ratchet Effect in MDW motion,
MDW motion velocity measurements, Current-driven MDW motion, etc.
The book deals with the emerging field of spintronics, i.e.,
Opto-spintronics. Special emphasis is given on ultrafast optical
controlling of magnetic states of antiferromagnet, Spin-photon
interaction, Faraday Effect, Inverse Faraday Effect and outline of
different all-optical spintronic switching. One more promising
branch i.e., Terahertz Spintronics is also covered. Principle of
operation of spintronic terahertz emitter, choice of materials,
terahertz writing of an antiferromagnetic magnetic memory device is
discussed. Brief introduction of Semiconductor spintronics is
presented that includes dilute magnetic semiconductor, feromagnetic
semiconductor, spin polarized semiconductor devices, three terminal
spintronic devices, Spin transistor, Spin-LED, and Spin-Laser. This
book also emphasizes on several modern spintronics devices that
includes GMR Read Head of Modern Hard Disk Drive, MRAM, Position
Sensor, Biosensor, Magnetic Field sensor, Three Terminal Magnetic
Memory Devices, Spin FET, Race Track Memory and Quantum Computing.
General
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