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Submicrometer Stripes and Bubbles in Amorphous Films

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2 Author(s)
Chaudhari, P. ; IBM Thomas J. Watson Research Center, Yorktown Heights, New York 10598, USA ; Herd, S.R.

Lorentz microscopy is used to study amorphous thin films of Gd-Co-Au and Gd-Co-Mo having a range of Q values. Stripe and bubble formation are shown as a function of perpendicular bias fields and pulsed or rotating in-plane fields. In the presence of an in-plane field, stripes contain a pair of Bloch lines and break into rows of Bloch-line containing bubbles. A unichiral stripe, however, forms a unichiral bubble that is stable to higher perpendicular bias fields than are Bloch-line bubbles. Bloch-line rotation in bubble walls in the presence of external rotating fields is demonstrated, and Bloch-line motion due to sweeping in-plane walls is shown. The rare occurrence of four Bloch lines in a 0.2-µm bubble is observed, as is the pearl-like accumulation of multiple Bloch lines in walls of irregularly shaped domains.

Note: The Institute of Electrical and Electronics Engineers, Incorporated is distributing this Article with permission of the International Business Machines Corporation (IBM) who is the exclusive owner. The recipient of this Article may not assign, sublicense, lease, rent or otherwise transfer, reproduce, prepare derivative works, publicly display or perform, or distribute the Article.  

Published in:

IBM Journal of Research and Development  (Volume:20 ,  Issue: 2 )