T. Kohashi et al., A SPIN ROTATOR FOR DETECTING ALL 3 MAGNETIZATION VECTOR COMPONENTS BYSPIN-POLARIZED SCANNING ELECTRON-MICROSCOPY, Review of scientific instruments, 66(12), 1995, pp. 5537-5543
A spin rotator for observing magnetic domains with all three magnetiza
tion components of a sample surface by spin-polarized scanning electro
n microscopy (spin SEM) has been developed. The spin rotator is placed
between the sample and the spin detector in a spin SEM, and can rotat
e the polarization vector of secondary electrons by pi/2. Although the
spin detector itself can detect only two independent polarization com
ponents, the rotation of polarization makes third-component detection
possible. The conventional spin rotator, which is a well-known energy
filter named a Wien filter, has been much improved to have a large foc
using area by using hyperbolic cylindrical pole pieces as a magnet and
several auxiliary electrodes. As a result, all the secondary electron
s emitted from the area of a surface as large as 1 mm in diameter can
pass the spin rotator with uniform spin rotation, and the distribution
of all three magnetization components can be imaged successfully by s
pin SEM. (C) 1995 American Institute of Physics.