Title :
Direct optical observation of vertical Bloch lines propagation by in-plane field pulses
Author :
Logginov, Alexander S. ; Nikolaev, Alexei V. ; Dobrovitski, Viacheslav V.
Author_Institution :
Dept. of Phys., Moscow State Univ., Russia
fDate :
11/1/1993 12:00:00 AM
Abstract :
Vertical Bloch line (VBL) motion in response to in-plane field pulses is studied by the methods of polarized anisotropic dark field observation (PADO) and high-speed photography in bubble garnets. The mobility of VBLs and their velocities are measured. New types of PADO pictures which are connected with the dynamic changes of VBL and domain wall structures are observed in the nonlinear region of Bloch line motion. A difference in the dynamic behavior of VBLs of different types is observed. A qualitative discussion of the origin of PADO contrast features and VBL behavior difference is proposed
Keywords :
bismuth compounds; ferrites; garnets; high-speed optical techniques; light diffraction; light polarisation; magnetic bubbles; magnetic domain walls; magnetic thin films; magneto-optical effects; thulium compounds; (BiTm)3(FeGa)5O12 garnet film; Bloch line motion; PADO contrast features; PADO pictures; bubble garnets; direct optical observation; domain wall structures; high-speed photography; in-plane field pulses; mobility; nonlinear region; polarized anisotropic dark field observation; velocities; vertical Bloch lines propagation; Anisotropic magnetoresistance; Garnets; Geometrical optics; High speed optical techniques; Nonlinear optics; Optical polarization; Optical propagation; Optical pulses; Photography; Velocity measurement;
Journal_Title :
Magnetics, IEEE Transactions on
