Direct optical observation of Bloch lines and their motion in uniaxial garnet films using a polarizing light microscope

Theile, J.; Engemann, J.
August 1988
Applied Physics Letters;8/22/1988, Vol. 53 Issue 8, p713
Academic Journal
Recently, the first direct optical observation of vertical Bloch lines using a laser scanning microscope has been reported (A. Thiaville, L. Arnaud, F. Boileau, and G. Sauron, EMMA Conference, Salford, Great Britain, 1987, paper AD-19). Here we describe a different way of direct observation that uses a polarizing light microscope. This method has the advantage of lower thermal disturbance of the domain structure and the ability of real-time observation. To obtain one-sided dark-field illumination, the incoming light beam is coupled into the garnet film by means of a glass microprism. On examining the Bi-containing film, the Bloch lines can be directly observed through the eyepiece of the microscope. Movement of Bloch lines caused by in-plane field pulses, and also by asymmetric bias field pulses, is observed.


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