Electron holography study of magnetization behavior in the writer pole of a perpendicular magnetic recording head by a 1 MV transmission electron microscope.
The magnetic domain structure of the writer poles of perpendicular magnetic recording heads was studied using electron holography. Although the domain structure of a 100-nm-thick writer pole could be observed with a 300 kV transmission electron microscope, that of the 250-nm-thick writer pole could not be analyzed due to the limited transmission capability of the instrument. On the other hand, the detailed domain structure of the 250-nm-thick writer pole was successfully analyzed by a 1 MV electron microscope using its high transmission capability. The thickness and material dependency of the domain structure of a writer pole were discussed.
TDK Corporation, Saku, Nagano, Japan.
Kei
K
Hirata
Yoichi
Y
Ishida
Tetsuya
T
Akashi
Daisuke
D
Shindo
Akira
A
Tonomura
D016880:Anisotropy; D004583:Electrons; D006696:Holography / Q000379:methods*; D008280:Magnetics / Q000295:instrumentation*; D046529:Microscopy, Electron, Transmission / Q000295:instrumentation* / Q000379:methods*