Download GTU BE/B.Tech 2019 Winter 7th Sem New 2173902 Spintronics Question Paper

Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 7th Sem New 2173902 Spintronics Previous Question Paper

1
Seat No.: ________ Enrolment No.___________

GUJARAT TECHNOLOGICAL UNIVERSITY

BE - SEMESTER ? VII (New) EXAMINATION ? WINTER 2019
Subject Code: 2173902 Date: 26/11/2019

Subject Name: Spintronics
Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.


MARKS

Q.1 (a) Write down wave function equation in the vicinity of Quantum
Mechanics.
03
(b) Draw the ferromagnetic and antiferromagnetic configurations of
magnetic multilayers film.
04
(c) Write a short note on early history of electron spin. 07

Q.2 (a) Sketch spin based silicon transistor with necessary notation. 03
(b) Explain normal magneto resistance: 04
(c) Explain : Spin Hall Effect 07
OR
(c) Write a short note on simple free electron theory. 07
Q.3 (a) Define : Elastic Collision at the surfaces 03
(b) Draw three different type of geometry in spin LED. 04
(c) Explain resistance change in multilayer structure in the vicinity of
spintronics devices.
07
OR
Q.3 (a) Write down various reasons for the spin scattering in spintronics
devices.
03
(b) Explain: periodic super lattice in the vicinity of spintronics. 04
(c) Write a short note on electron transport theory covering Boltzmann
equation.
07
Q.4 (a) List out various problems associated with spin-LED for real life
application.
03
(b) Draw current flows mechanism in CPP (Current perpendicular to
plane) geometry for the multilayer GMR Devices.
04
(c) Write a short note on Ratchet effect in domain wall. 07
OR
Q.4 (a) Define : current driven domain wall motion 03
(b) What do you mean by domain wall scattering? 04
(c) Explain working of Spin LED with necessary diagram. 07
Q.5 (a) Draw the schematic illustration of the magnetization reversal process
in a ferromagnetic wire.
03
(b) Write a short note on Oxide-based tunnel injectors. 04
(c) Write a short note on Domain wall velocity measurements. 07
OR

Q.5 (a) Define: Quantum Dot. 03
(b) Write a short note on Spin and exchange effect in quantum dot. 04
(c) Write a short note on spin photo electronic devices. 07
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