A new system of observing and measuring magnetic domain is designed in this paper. The system includes three parts - the principal part of observing and measuring the magnetic domain, the crate controller and the computer used to control
the whole system. The principal part consists of x-y scanner, z scanner, digital source meter, ion blower, optical
microscope, and giant magnetic resistor (GMR) magnetic head. The GMR magnetic head in this system can be intact
after a long-time running in the ordinary laboratory by taking some measures of eliminating electrostatic discharge
(ESD). We successfully observed the magnetic domain written in a nanomagnetic material and measured the size of the
magnetic domain by use of the new system. The system is very simple and inexpensive, and it has high resolution and
signal-to-noise.
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