Download GTU B.Tech 2020 Winter 7th Sem 2173902 Spintronics Question Paper

Download GTU (Gujarat Technological University Ahmedabad) B.Tech/BE (Bachelor of Technology/ Bachelor of Engineering) 2020 Winter 7th Sem 2173902 Spintronics Previous Question Paper

Seat No.: ________
Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER?VII (NEW) EXAMINATION ? WINTER 2020
Subject Code:2173902 Date:21/01/2021
Subject Name:Spintronics
Time:10:30 AM TO 12:30 PM Total Marks: 56
Instructions:
1. Attempt any FOUR questions out of EIGHT questions.

2. Make suitable assumptions wherever necessary.

3. Figures to the right indicate full marks.


MARKS
Q.1 (a) Define : Scattering in multilayer
03

(b) Explain: Periodic Super Lattice for magnetoresistance in
04
vicinity of resistor network.

(c) Write a short note on Stern-Gerlach experiment.
07


Q.2 (a) Write down various reasons for the spin scattering in
03
Spintronics devices.

(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

(b) Discuss real experiment problems associated with Spin-LED
04
device.

(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
07
Spintronics.
Q.5 (a) What do you mean by Quantum Mechanics.
03

(b) Explain : Role of ferromagnetic Heusler alloy in Spintronics
04
devices

(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

(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
07
nucleation



Q.8 (a) Sketch spin based silicon transistor with necessary notation.
03
(b) Explain role of Oxide-based tunnel injectors.
04
(c) Explain: Ratchet effect in domain wall.
07
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