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SUMMARY:-Magnetic ratchet for 3-dimensional data storage based on perpendi
 cularly magnetized Pt/CoFeB- Dr Reinoud Lavrijsen - Speaker to be confirme
 d
DTSTART:20120426T140000Z
DTEND:20120426T150000Z
UID:TALK37914@talks.cam.ac.uk
CONTACT:Kimberly Cole
DESCRIPTION:The use of (perpendicularly magnetized) synthetic-antiferromag
 nets (AFM) formed by ferromagnetic (FM) layers coupled anti-ferromagnetica
 lly\, is highly suitable for a wide field of applications due to the high 
 control achieved in the properties of these artificial structures. Specifi
 cally\, these synthetic-AFMs have a high potential to be used in spintroni
 c devices [1] . A full understanding of the reversal of such structures un
 der external fields and currents is therefore of high interest. In particu
 lar\, the perpendicularly magnetized archetypal [[Pt/Co]X/Ru]N with X\,N >
  1 system has been studied extensively due to its excellent properties for
  data storage applications and fundamentally for the nano-scale phase-form
 ations it exhibits [2\,3].\nIn this presentation we will discuss our lates
 t study of the tunability of the RKKY-interlayer exchange coupling (IEC) i
 n Pt/CoFeB/Pt/Ru/Pt/CoFeB/Pt stacks with perpendicular magnetic anisotropy
  (PMA) [4]. By inserting a Pt layer between Ru and CoFeB\, the PMA of the 
 ultrathin CoFeB layers is stabilized and the IEC can be tuned. In particul
 ar\, we show that the IEC versus Pt thickness exhibits a simple exponentia
 l decay with a decay length of 0.16 nm.\nThis allows us to create multilay
 ers (N>>1) using single CoFeB layers with PMA. By carefully tuning the IEC
  and CoFeB thickness we will show how a sharp magnetic kink soliton can be
  injected and propagated using a unidirectional ratchet scheme. This paves
  the way for a novel 3-dimensional shift register\, where the data is stor
 ed in the 3rd dimension. This potentially holds the promise for a thousand
 -fold increase in data storage density.\n\n\n[1] B. G. Park\, J. Wunderlic
 h\, X. Marti\, V. Holy\, Y. Kurosaku\, M. Yamada\, H. Yamamoto\, A. Nishid
 e\, J. Hayakawa\, H. Takahashi\, A. B. Shick\, and T. Jungwirth\, Nature M
 at. 10\, 347 (2011).\n[2] O. Hellwig\, A. Berger\, K. J. B.\, and F. E. E.
 \, J. Magn. Magn. Mater. 319\, 13 (2007).\n[3] O. Hellwig\, T. Hauet\, T. 
 Thompon\, E. Dobisz\, J. D. Risner-Jamtgaard\, D. Yaney\, B. D. Terris\, a
 nd E. E. Fullerton\, Appl. Phys. Lett. 95\, 232505 (2009).\n[4] R. Lavrijs
 en\, A. Fernández-Pacheco\, D. Petit\, R. Mansell\, J. H. Lee\, and R. P.
  Cowburn\, Appl. Phys. Lett.\, 100\, 052411\, (2012)\n
LOCATION:Mott Seminar Room\, Cavendish Laboratory
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