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Durham University

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Publication details for Professor Del Atkinson

Allwood, D. A., Xiong, G., Cooke, M. D., Faulkner, C. C., Atkinson, D., Vernier, N. & Cowburn, R. P. (2002). Submicrometer ferromagnetic NOT gate and shift register. Science 296(5575): 2003-2006.

Author(s) from Durham

Abstract

An all-metallic submicrometer device is demonstrated experimentally at room temperature that performs logical NOT operations on magnetic logic signals. When this two-terminal ferromagnetic structure is incorporated into a magnetic feedback loop, the junction performs a frequency division operation on an applied oscillating magnetic field. Up to 11 of these junctions are then directly linked together to create a magnetic shift register.

References

1. G. A. Prinz, Science 282, 1660 (1998).
2. S. A. Wolf et al., Science 294, 1488 (2001).
3. D. Loss, D. P. DiVicenzo, Phys. Rev. A 57, 120 (1998).
4. S. Koshihara et al., Phys. Rev. Lett. 78, 4617 (1997).
5. H. Ohno et al., Nature 408, 944 (2000).
6. D. J. Monsma, R. Vlutters, J. C. Lodder, Science 281,
407 (1998).
7. R. Fiederling et al., Nature 402, 787 (1999).
8. Y. Ohno et al., Nature 402, 790 (1999).
9. R. K. Kawakami et al., Science 294, 131 (2001).
10. J. H. Smet et al., Nature 415, 281 (2002).
11. M. N. Baibich et al., Phys. Rev. Lett. 61, 2472 (1988).
12. J. S. Moodera, L. R. Kinder, T. M. Wong, R. Meservey,
Phys. Rev. Lett. 74, 3273 (1995).
13. R. P. Cowburn, M. E. Welland, Science 287, 1466
(2000).
14. http://math.nist.gov/oommf/
15. T. Ono et al., Science 284, 468 (1999).
16. G. Xiong, D. A. Allwood, M. D. Cooke, R. P. Cowburn,
Appl. Phys. Lett. 79, 3461 (2001).
17. R. P. Cowburn, D. K. Koltsov, A. O. Adeyeye, M. E.
Welland, Appl. Phys. Lett. 73, 3947 (1998).
18. The magnetization transitions shown in Fig. 2C indicate
that domain walls require a parallel magnetic
Þeld of just 3 Oe to propagate in continuous wire
sections, which is when the orthogonal component of
the rotating Þeld is close to its maximum value.
19. W. C. Black Jr., B. Das, J. Appl. Phys. 87, 6674 (2000).
20. C.-Y. You, S. D. Bader, J. Appl. Phys. 87, 5215 (2000).
21. In the previous case of one NOT gate in a feedback
loop, no pulsed-Þeld initialization was required owing
to the simpler topology involved.
22. W. A. Triebel, A. E. Chu, Handbook of Semiconductor
and Bubble Memories (Prentice-Hall, Englewood
Cliffs, NJ, 1982).
23. M. Redjdal, J. Guisti, M. F. Ruane, F. B. Humphrey,
J. Appl. Phys., 91, 7547 (2002).
24. Switching energy was calculated with the area of the
magnetization hysteresis loop and suitable bulk
constants.
25. This work was supported by Eastgate Investments
Ltd.