6.7 Exercises
161
6.7 Exercises
1. What is magnetic domain wall?
2. How does the resistance of a multilayer film changes with the motion of a
domain wall?
3. What is Ratchet effect?
4. Which is the better technique to determine the domain wall velocity and explain
how?
5. How can one obtain higher domain wall velocity in nanoscale devices?
6. What are the advantages of current-driven domain wall motion over the external
applied field one?
7. Why do domains exist? Why small particles are always mono-domain?
8. How domain-wall propagation can be detected in a magnetic nanowire?
9. Describe Ratchet effect in a trilayer magnetic wire with schematic representation.
10. What is current-driven domain wall motion?
11. What will happen if an electric current flows through this domain wall?
12. What are the applications of current-driven domain wall motion?
References
D.A. Allwood et al., Science 296, 2003 (2002)
D. Atkinson, D.A. Allwood, G. Xiong, M.D. Cooke, C.C. Faulkner, R.P. Cowburn, Nat. Mater. 2,
85 (2003)
M.N. Baibich et al., Phys. Rev. Lett. 61, 2472 (1988)
N. García, M. Munoz, Y.W. Zhao, Phys. Rev. Lett. 82, 2923 (1999)
A. Himeno, T. Ono, S. Nasu, T. Okuno, K. Mibu, T. Shinjo, Dynamics of magnetic domain walls
in nanomagnetic systems. J. Magn. Magn. Mater. 272–276, 1577 (2004)
A. Himeno et al., J. Magn. Magn. Mater. 286, 167 (2005a)
A. Himeno et al., J. Appl. Phys. 97, 066101 (2005b)
S. Lepadatu, Y.B. Xu, Phys. Rev. Lett. 92, 127201 (2004)
S. Lepadatu, Y.B. Xu, E. Ahmad, J. Appl. Phys. 97, 10J708 (2005)
P.M. Levy, S. Zhang, Phys. Rev. Lett. 79, 5110 (1997)
H. Numata et al., Symposium on VLSI Technical Digest (2007), pp. 232
T. Ono, H. Miyajima, K. Shigeto, K. Mibu, N. Hosoito, T. Shinjo, Science 284, 468 (1999)
S.S.P. Parkin, U.S. Patent No. 6834005 (2004)
K.J. Sixtus, L. Tonks, Phys. Rev. 37, 930 (1931)
J.J. Versluijs, M.A. Bari, J.M.D. Coey, Phys. Rev. Lett. 87, 026601 (2001)
P. Weiss, J. Phys. 6, 661 (1907)
A. Yamaguchi et al., Phys. Rev. Lett. 92 077205 (2004); 96 179904(E) (2006)
161
6.7 Exercises
1. What is magnetic domain wall?
2. How does the resistance of a multilayer film changes with the motion of a
domain wall?
3. What is Ratchet effect?
4. Which is the better technique to determine the domain wall velocity and explain
how?
5. How can one obtain higher domain wall velocity in nanoscale devices?
6. What are the advantages of current-driven domain wall motion over the external
applied field one?
7. Why do domains exist? Why small particles are always mono-domain?
8. How domain-wall propagation can be detected in a magnetic nanowire?
9. Describe Ratchet effect in a trilayer magnetic wire with schematic representation.
10. What is current-driven domain wall motion?
11. What will happen if an electric current flows through this domain wall?
12. What are the applications of current-driven domain wall motion?
References
D.A. Allwood et al., Science 296, 2003 (2002)
D. Atkinson, D.A. Allwood, G. Xiong, M.D. Cooke, C.C. Faulkner, R.P. Cowburn, Nat. Mater. 2,
85 (2003)
M.N. Baibich et al., Phys. Rev. Lett. 61, 2472 (1988)
N. García, M. Munoz, Y.W. Zhao, Phys. Rev. Lett. 82, 2923 (1999)
A. Himeno, T. Ono, S. Nasu, T. Okuno, K. Mibu, T. Shinjo, Dynamics of magnetic domain walls
in nanomagnetic systems. J. Magn. Magn. Mater. 272–276, 1577 (2004)
A. Himeno et al., J. Magn. Magn. Mater. 286, 167 (2005a)
A. Himeno et al., J. Appl. Phys. 97, 066101 (2005b)
S. Lepadatu, Y.B. Xu, Phys. Rev. Lett. 92, 127201 (2004)
S. Lepadatu, Y.B. Xu, E. Ahmad, J. Appl. Phys. 97, 10J708 (2005)
P.M. Levy, S. Zhang, Phys. Rev. Lett. 79, 5110 (1997)
H. Numata et al., Symposium on VLSI Technical Digest (2007), pp. 232
T. Ono, H. Miyajima, K. Shigeto, K. Mibu, N. Hosoito, T. Shinjo, Science 284, 468 (1999)
S.S.P. Parkin, U.S. Patent No. 6834005 (2004)
K.J. Sixtus, L. Tonks, Phys. Rev. 37, 930 (1931)
J.J. Versluijs, M.A. Bari, J.M.D. Coey, Phys. Rev. Lett. 87, 026601 (2001)
P. Weiss, J. Phys. 6, 661 (1907)
A. Yamaguchi et al., Phys. Rev. Lett. 92 077205 (2004); 96 179904(E) (2006)