| 摘要 |
PURPOSE:To improve the precision of measurement of a magnetic domain width by arranging a bubble crystal of a sample in parallel with the magnetic pole face of a permanent magnet and moving the position, where the magnetic domain of the bubble crystal should be expanded into the shape of a parallel line, in the direction crossing the ridgeline of a corner part of the permanent magnet to expand surely the magnetic domain even if the diameter of the bubble is reduced. CONSTITUTION:A spacer 6 is moved back and forth in the direction where a point 1a to be measured traverses a ridgeline P-Q of a corner part 5 between upper and lower magnetic pole faces 4n and 4s of a permanent magnet 4 and a side face 4a, namely, in the direction of an arrow a1. Then, the bubble domain at the point 1a of a bubble crystal 1 is expanded into the shape of a parallel line. A magnetic flux F near the edge part 5 is divided to components alpha in the direction parallel with the plane of the bubble crystal above it and components beta in the direction vertical to this plane. Therefore, components alpha in the direction of the plane correspond to a DC magnetic field, and the bubble magnetic domain is expnded in the alpha direction, namely, in the direction vertical to the ridgeline P-Q. The bubble crystal 1 is moved on the edge part 5 in the direction vertical to it, but it is considered that the bubble crystal 1 is moved with minute oscillation, and components in the direction vertical to the crystal face act similarly to an AC magnetic field to move the bubble magnetic domain more easily. |
