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2 Basic Elements of Spintronics
6. Discuss spin injection process in case of ferromagnetic metal–paramagnetic
semiconductor interface for both (i) Ohmic contact and (ii) tunnel/Schottky
contact. Hence conclude which one is efficient for spin injection.
7. Derive the spin–orbit interaction Hamiltonian.
8. What is the role of spin–orbit interaction in the field of spintronics?
9. Does the electron in a rotating orbit around the nucleus accelerate constantly?
10. What is spin relaxation?
11. Define spin relaxation length.
12. Describe Elliott–Yafet spin relaxation mechanism?
13. What is the prerequisite condition for Elliott–Yafet mechanism?
14. Where does the Elliott–Yafet mechanism of spin scattering occur?
15. Describe the Rashba interaction?
16. What is the important role of Rashba interaction?
17. Describe the Dresselhaus interaction?
18. Describe briefly the basic concepts of D’yakonov-Perel’ mechanism?
19. What is the prerequisite condition for D’yakonov-Perel’ mechanism?
20. Considering D’yakonov-Perel’ mechanism, is frequent momentum scattering
actually be beneficial for spin longevity?
21. Where does D’yakonov-Perel’ mechanism occur?
22. Describe briefly the basic concepts of Bir-Aronov-Pikus mechanism?
23. Where does the Bir-Aronov-Pikus mechanism of spin scattering occur?
24. Write down the Hamiltonian describing hyperfine interaction. How hyperfine
interaction causes the dephasing of electron spins of a spin-polarized electron
ensemble?
25. Can the magnetic field generated by a nuclear spin cause complete loss of
electron spin polarization?
26. Consider two situations where an ensemble of electrons is drifting and diffusing
in a solid. If the electrons velocity changes as delta function in one situation
and Gaussian function with time in another situation, in which case will the
spin relaxation process for D’yakonov-Perel’ mechanism be faster? Explain
why?
27. What is spin valve device?
28. Discuss the operation of spin valve effect with schematic diagram.
29. Describe spin valve device experiments.
30. Give a physical description of spin valve effect.
31. Define spin extraction process.
32. What is spin Hall effect?
33. What is heat-driven Seebeck effect?
34. Describe spin current measurement mechanism.
35. What is spin accumulation?
36. How will you estimate the spin accumulation length by a simple method?
37. How do we detect the injected spins into semiconductor?
38. What is called as conductance mismatch?
39. Explain how to overcome the conductance mismatch problem for efficient spin
injection?
2 Basic Elements of Spintronics
6. Discuss spin injection process in case of ferromagnetic metal–paramagnetic
semiconductor interface for both (i) Ohmic contact and (ii) tunnel/Schottky
contact. Hence conclude which one is efficient for spin injection.
7. Derive the spin–orbit interaction Hamiltonian.
8. What is the role of spin–orbit interaction in the field of spintronics?
9. Does the electron in a rotating orbit around the nucleus accelerate constantly?
10. What is spin relaxation?
11. Define spin relaxation length.
12. Describe Elliott–Yafet spin relaxation mechanism?
13. What is the prerequisite condition for Elliott–Yafet mechanism?
14. Where does the Elliott–Yafet mechanism of spin scattering occur?
15. Describe the Rashba interaction?
16. What is the important role of Rashba interaction?
17. Describe the Dresselhaus interaction?
18. Describe briefly the basic concepts of D’yakonov-Perel’ mechanism?
19. What is the prerequisite condition for D’yakonov-Perel’ mechanism?
20. Considering D’yakonov-Perel’ mechanism, is frequent momentum scattering
actually be beneficial for spin longevity?
21. Where does D’yakonov-Perel’ mechanism occur?
22. Describe briefly the basic concepts of Bir-Aronov-Pikus mechanism?
23. Where does the Bir-Aronov-Pikus mechanism of spin scattering occur?
24. Write down the Hamiltonian describing hyperfine interaction. How hyperfine
interaction causes the dephasing of electron spins of a spin-polarized electron
ensemble?
25. Can the magnetic field generated by a nuclear spin cause complete loss of
electron spin polarization?
26. Consider two situations where an ensemble of electrons is drifting and diffusing
in a solid. If the electrons velocity changes as delta function in one situation
and Gaussian function with time in another situation, in which case will the
spin relaxation process for D’yakonov-Perel’ mechanism be faster? Explain
why?
27. What is spin valve device?
28. Discuss the operation of spin valve effect with schematic diagram.
29. Describe spin valve device experiments.
30. Give a physical description of spin valve effect.
31. Define spin extraction process.
32. What is spin Hall effect?
33. What is heat-driven Seebeck effect?
34. Describe spin current measurement mechanism.
35. What is spin accumulation?
36. How will you estimate the spin accumulation length by a simple method?
37. How do we detect the injected spins into semiconductor?
38. What is called as conductance mismatch?
39. Explain how to overcome the conductance mismatch problem for efficient spin
injection?