GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VII (NEW) EXAMINATION — WINTER 2020
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Subject Code:2173902 Date:21/01/2021
Subject Name:Spintronics
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Define: Scattering in multilayer 03
(b) Explain: Periodic Super Lattice for magnetoresistance in vicinity of resistor network. 04
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(c) Write a short note on Stern-Gerlach experiment. 07
Q.2 (a) Write down various reasons for the spin scattering in Spintronics devices. 03
(b) Explain : Spin — Orbit interaction 04
(c) Explain working of Spin LED with necessary diagram. 07
Q.3 (a) What do mean by Magnetic domain wall? 03
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(b) Discuss real experiment problems associated with Spin-LED device. 04
(c) Explain :Spin photo electronic devices 07
Q.4 (a) Define: Current driven domain wall motion 03
(b) Draw geometry for oblique Hanle geometry LED 04
(c) Briefly explain importance of history of electron spin for Spintronics. 07
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Q.5 (a) What do you mean by Quantum Mechanics. 03
(b) Explain : Role of ferromagnetic Heusler alloy in Spintronics devices 04
(c) Explain: Resistance change in multilayer structure. 07
Q.6 (a) Draw current flows mechanism in CPP geometry in device. 03
(b) Explain:‘Scattering based magnetoresistance in multilayer. 04
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(c) Write a short note on Domain wall velocity measurements. 07
Q.7 (a) What is magnetization reversal process? 03
(b) Explain: Spin and exchange effect in quantum dot. 04
(c) Explain: domain-wall propagation and domain wall nucleation 07
Q.8 (a) Sketch spin based silicon transistor with necessary notation. 03
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(b) Explain role of Oxide-based tunnel injectors. 04
(c) Explain: Ratchet effect in domain wall. 07
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