Magnetic hysteresis loop tuning in antiferromagnetically coupled bilayer structures

Berger, A.; Margulies, D. T.; Do, H.
August 2004
Applied Physics Letters;8/30/2004, Vol. 85 Issue 9, p1571
Academic Journal
We have utilized antiferromagnetically coupled bilayer structures to magnetically tune hysteresis loop properties. A key element of this approach is the nonoverlapping switching field distribution of the two magnetic layers. This allows measurement of the magnetization reversal in the soft-magnetic layer (SL) at low fields without perturbing the magnetic state of the hard-magnetic layer (HL). The magnetization of HL can be changed by an appropriate high-field sequence, which also modifies the effective disorder level in SL due to the antiferromagnetic interlayer coupling. Variations of the SL hysteresis loop squareness by a factor of up to 50 are reported by utilizing this fully reversible tuning procedure.


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