DocumentCode :
822778
Title :
Time-resolved measurement of micro-magnetic field by stroboscopic electron beam tomography
Author :
Shinada, Hiroyuki ; Suzuki, Hiroshi ; Sasaki, Shinobu ; Todokoro, Hideo ; Takano, Hisashi ; Shiiki, Kazuo
Author_Institution :
Hitachi Ltd., Tokyo, Japan
Volume :
28
Issue :
5
fYear :
1992
fDate :
9/1/1992 12:00:00 AM
Firstpage :
3117
Lastpage :
3122
Abstract :
Stroboscopic electron-beam tomography has been achieved for time-resolved measurement of the magnetic recording thin-film head. The transition characteristics of magnetic field distributions were compared; the driving current was found to have a temporal resolution of 1 ns. Both the driving current waveforms and the magnetic field distributions are measured by a pulsed electron beam with the same timing pulse gate. This measurement was successfully applied to Ni-Fe and CoTaZr amorphous thin-film disk heads. It was found that the magnetic field distribution change with time is not uniform and that the peak field is a few nanoseconds behind the driving current for Ni-Fe heads. The frequency characteristics of these heads correspond for the magnetic field delay to the driving current. The frequency characteristics of the head whose magnetic field delay is longer are inferior to those of the head whose magnetic field delay is shorter
Keywords :
electron beam testing; magnetic field measurement; magnetic heads; magnetic thin film devices; CoTaZr; Ni-Fe heads; amorphous thin-film; driving current waveforms; frequency characteristics; magnetic field delay; magnetic field distributions; magnetic recording; micromagnetic field; pulsed electron beam; stroboscopic electron beam tomography; thin-film head; time-resolved measurement; transition characteristics; Current measurement; Delay; Frequency; Magnetic field measurement; Magnetic fields; Magnetic films; Magnetic heads; Magnetic recording; Pulse measurements; Tomography;
fLanguage :
English
Journal_Title :
Magnetics, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9464
Type :
jour
DOI :
10.1109/20.179731
Filename :
179731
Link To Document :
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