Shape effects on magnetization state transitions in individual 160-nm diameter Permalloy disks

Physical Review B - Condensed Matter and Materials Physics

Volumn 77, Issue 17, 2008, Pages

  Liu, Zhigang ^a   Sydora, Richard D ^a   Freeman, Mark R ^a,b  

^a UNIVERSITY OF ALBERTA   (Canada)

^b NATIONAL RESEARCH COUNCIL CANADA   (Canada)

Author keywords

[No Author keywords available]

Indexed keywords

EID: 43449117214     PISSN: 10980121     EISSN: 1550235X     Source Type: Journal    
DOI: 10.1103/PhysRevB.77.174410     Document Type: Article

References (28)

1. Ultrathin Magnetic Structures IV, Applications of Nanomagnetism, edited by, B. Heinrich, and, J. A. C. Bland, (Springer, New York, 2005).
2. J. Åkerman, Science SCIEAS 0036-8075 10.1126/science.1110549 308, 508 (2005).
3. Magnetoelectronics, edited by, M. Johnson, (Elsevier, Oxford, 2004).
4. S. D. Bader, Rev. Mod. Phys. RMPHAT 0034-6861 10.1103/RevModPhys.78.1 78, 1 (2006).
5. C. L. Chien, F. Q. Zhu, and J. G. Zhu, Phys. Today 60 (6), 40 (2007). 0031-9228
6. K. Yu. Guslienko, V. Novosad, Y. Otani, H. Shima, and K. Fukamichi, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.65.024414 65, 024414 (2001).
7. K. Yu. Guslienko, W. Scholz, R. W. Chantrell, and V. Novosad, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.71.144407 71, 144407 (2005).
8. R. Zivieri and F. Nizzoli, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.71.014411 71, 014411 (2005).
9. R. P. Cowburn, D. K. Koltsov, A. O. Adeyeye, M. E. Welland, and D. M. Tricker, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.83.1042 83, 1042 (1999).
10. V. V. Kruglyak, A. Barman, R. J. Hicken, J. R. Childress, and J. A. Katine, J. Appl. Phys. JAPIAU 0021-8979 10.1063/1.1849057 97, 10A706 (2005).
11. A. V. Jausovec, G. Xiong, and R. P. Cowburn, Appl. Phys. Lett. APPLAB 0003-6951 10.1063/1.2170403 88, 052501 (2006).
12. I. N. Krivorotov, N. C. Emley, J. C. Sankey, S. I. Kiselev, D. C. Ralph, and R. A. Buhrman, Science SCIEAS 0036-8075 10.1126/science.1105722 307, 228 (2005).
13. A. Barman, S. Wang, J. D. Maas, A. R. Hawkins, S. Kwon, A. Liddle, J. Bokor, and H. Schmidt, Nano Lett. NALEFD 1530-6984 10.1021/nl0623457 6, 2939 (2006).
14. V. S. Pribiag, I. N. Krivorotov, G. D. Fuchs, P. M. Braganca, O. Ozatay, J. C. Sankey, D. C. Ralph, and R. A. Buhrman, Nat. Phys. ZZZZZZ 1745-2473 3, 498 (2007).
15. K. S. Buchanan, X. Zhu, A. Meldrum, and M. R. Freeman, Nano Lett. NALEFD 1530-6984 10.1021/nl0482377 5, 383 (2005).
16. X. Zhu, Z. Liu, V. Metlushko, P. Grütter, and M. R. Freeman, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.71.180408 71, 180408 (R) (2005).
17. Z. Liu, F. Giesen, X. Zhu, R. D. Sydora, and M. R. Freeman, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.98.087201 98, 087201 (2007).
18. K. Yu. Guslienko and A. N. Slavin, J. Appl. Phys. JAPIAU 0021-8979 10.1063/1.372698 87, 6337 (2000).
19. The gyrotropic motion of the vortex core, with a low frequency of ∼1 GHz, is also visible in some of our measurements, such as, for example, in Fig. 2.
20. J. P. Park and P. A. Crowell, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.95.167201 95, 167201 (2005).
21. M. Buess, R. Höllinger, T. Haug, K. Perzlmaier, U. Krey, D. Pescia, M. R. Scheinfein, D. Weiss, and C. H. Back, Phys. Rev. Lett. PRLTAO 0031-9007 10.1103/PhysRevLett.93.077207 93, 077207 (2004).
22. C. E. Zaspel, B. A. Ivanov, J. P. Park, and P. A. Crowell, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.72.024427 72, 024427 (2005).
23. R. P. Cowburn, J. Phys. D JPAPBE 0022-3727 10.1088/0022-3727/33/1/201 33, R1 (2000).
24. M. Grimsditch, P. Vavassori, V. Novosad, V. Metlushko, H. Shima, Y. Otani, and K. Fukamichi, Phys. Rev. B PRBMDO 0163-1829 10.1103/PhysRevB.65. 172419 65, 172419 (2002).
25. We used our own micromagnetics code [Z. Liu, Ph.D. thesis, University of Alberta, 2008].
26. This was benchmarked against M. Scheinfein's, LLG Micromagnetics Simulator™ (http://llgmicro.home.mindspring.com/). The code has also been checked by using OOMMF's standard problem No. 4 (http://www.ctcms.nist.gov/~rdm/ mumag.org.html).
27. Test simulations were also performed with 32×32×8 and 64×64×16 grid dimensions, and the results did not show a significant difference.
28. A. Imre, G. Csaba, L. Ji, A. Orlov, G. H. Bernstein, and W. Porod, Science SCIEAS 0036-8075 10.1126/science.1120506 311, 205 (2006).