Large Barkhausen discontinuity of Co-Fe-Si-B amorphous films sputtered on polymer substrate

Co-Fe-Si-B films have been prepared using a roll coater and DC magnetron sputtering system onto a polyethylene terephthalate substrate. This thin film exhibited an excellent uniaxial anisotropy introduced by an asymmetric thermal shrinkage of the substrate. Reversal with a single large Barkhausen pu...

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Bibliographic Details
Published in:IEEE transactions on magnetics 1996-09, Vol.32 (5), p.4532-4534
Main Authors: Yano, N., Furukawa, S., Oka, K., Ogasawara, I., Yamasaki, J., Humphrey, F.B.
Format: Article
Language:English
Subjects:
Amorphous magnetic materials
Amorphous materials
Anisotropic magnetoresistance
Magnetic anisotropy
Magnetic domains
Perpendicular magnetic anisotropy
Plastic films
Polyethylene
Sputtering
Substrates
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Summary:Co-Fe-Si-B films have been prepared using a roll coater and DC magnetron sputtering system onto a polyethylene terephthalate substrate. This thin film exhibited an excellent uniaxial anisotropy introduced by an asymmetric thermal shrinkage of the substrate. Reversal with a single large Barkhausen pulse has been observed in thin film structure 1 mm by 50 mm by 0.65 /spl mu/m. Closure domains have been clearly identified at the film ends. The threshold for the reversal is the coercive force. The reason for reversal with a single Barkhausen jump is that the long narrow film geometry has essentially zero demagnetizing field over most of the film. Once the walls start to move through the center portion of the film, there is nothing to stop them so the reversal proceeds with a single large Barkhausen pulse.
ISSN:0018-9464
1941-0069
DOI:10.1109/20.538921