C. Tsang, R.E. Fontana Jr., et al.
IBM J. Res. Dev
In this work, we discuss the concept of patterned longitudinal-biasing as a means to suppress Barkhausen noise in narrow-track M R elements. This scheme has the advantage that the performance of the read-region is relatively insensitive to the exact magnitude of the externally applied longitudinal-bias, as long as this bias is large enough to ensure good longitudinal alignment of magnetization at the tail-regions. In particular, large longitudinal-bias can be applied at the tail-regions without serious permeability reduction in the center read-region. We demonstrate this concept in the experimental fabrication and testing of unshielded permalloy MR elements with patterned exchange-biasing. Results show that these elements do indeed exhibit quiet and stable responses, but without the severe sensitivity reduction which is characteristic of MR elements under strong uniform longitudinal-biasing. © 1989 IEEE
C. Tsang, R.E. Fontana Jr., et al.
IBM J. Res. Dev
R.E. Fontana, J.A. Katine, et al.
IEEE Transactions on Magnetics
J.R. Childress, M.J. Carey, et al.
IEEE Transactions on Magnetics
R.E. Fontana, J.A. Katine, et al.
INTERMAG 2002