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SUMMARY:360º Domain Walls- Anibal Gonzalez-Oyarace\, TFM - Speaker to be 
 confirmed
DTSTART:20130207T143000Z
DTEND:20130207T160000Z
UID:TALK43439@talks.cam.ac.uk
CONTACT:Kimberly Cole
DESCRIPTION:360º Domain Walls have been reported in the reversal processe
 s of thin\nfilms as a result of pinning defects [1]. Recently they have al
 so been\nobserved during the reversal process of closed structures even wi
 thout the\npresence of any apparent defects [2]. In terms of their applica
 tion to\ntechnological devices\, the  360º Domain Walls have been propose
 d to be used\nin the fabrication of as magnetic random access memory (MRAM
 ) [3]\, spin\nwave generators [4]\, magnetic memory recording devices [5] 
 and magnetic\nsensors [5].\n\nIn this talk I will introduce the main micro
 magnetic properties of a 360º\nDomain Walls and their role in the switchi
 ng of nanorings driven by\nazimuthal fields. A short study on the resilien
 ce of this reversal\nmechanism under temperature will also be shown. Moreo
 ver\, the results of a\nproposed magnetic memory recording devices based o
 n 360º Domain Walls will\nbe presented. Finally\, initial results on the 
 localized injection of 360º\nDomain Walls into stripes will be outlined.\
 n\nReferences:\n\n[1] P. Gaunt and C. K. Mylvaganam. Nucleation and pinnin
 g at 360◦ domain\nwalls in SmCo_5 and related alloys. J. Appl. Phys.\, 4
 8(6):2587–2590\, 1977.\n[2] F. J. Casta no\, C. A. Ross\, C. Frandsen\, 
 and A. Eilez et al. Metastable\nstates in magnetic nanorings. Phys. Rev. B
 \, 67(18):184425\, May 2003.\n[3]T. J. Hayward\, J. Llandro\, R. B. Balsod
 \, J. A. C. Bland\, D. Morecroft\,\nF. J. Castano\, and C. A. Ross. Switch
 ingn behavior of individual\npseudo-spin-valve ring structures. Phys. Rev.
  B\, 74:134405\, Oct 2006.\n[4] P. E. Roy\, T. Trypiniotis\, and C. H. W. 
 Barnes. Micromagnetic\nsimulations of spin-wave normal modes and the reson
 ant field-driven\nmagnetization dynamics of a 360◦ domain wall in a soft
  magnetic stripe.\nPhys. Rev. B\, 82:134411\, Oct 2010\n[5] C. B. Muratov 
 and V. V. Osipov. Bit storage by 360 domain walls in\nferromagnetic nanori
 ngs. IEEE Trans. Magn.\, 45:3207–3209\, 2009\n[6] M. Diegel\, R. Matthei
 s\, and E. Halder. 360 ◦ domain wall investigation\nfor sensor applicati
 ons. IEEE Trans. Magn.\, vol. 40\, no. 4\,:2655–2657\, 2004.
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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