Magnetic tunnel junctions were fabricated from La0.67 Sr0.33 Mn O3 (LSMO) SrTi O3 La0.67 Sr0.33 Mn O3 heterostructures. Junctions initially demagnetized at 5 K with an in-plane magnetic field showed larger tunneling magnetoresistance (TMR) and sharper switching than standard TMR scans. Magnetoresistive switching from the demagnetized state was stable in fields <80 G yielding a TMR of 475% and a ΔMRΔH≈200%G. Changes in resistance achievable at <500 G yielded a TMR of ≈850%. A similar TMR was seen when rotating the magnetic field from an in-plane to out-of-plane orientation. The demagnetized high resistance state may indicate that the LSMO layers preferentially choose a more efficient opposite magnetic domain alignment.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)