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- W2800334001 abstract "Exchange bias (HE) is manifested by a shift of the hysteresis loop of the ferromagnet (F) which is in contact with an antiferromagnet (AF) after field cooling the sample through the Neel temperature (TN) of the AF. In the first set of experiments, (110)-oriented AF FexZn1-xF2 / polycrystalline Co bilayers were grown on MgO (100) substrates via MBE with the AF twinned in the film plane. The blocking temperature was found to have a linear dependence on the x for x > 0.25, coinciding with the TN of the bulk dilute crystals. HE was increased by 65% for x = 0.84 with a 1.0 nm pure FeF2 between FexZn1-xF2 and Co, compared to pure FeF2 / Co bilayers, presumably due to the formation of domain states inside the dilute AF layers. The pure interface layer is crucial in increasing the coupling between the F and the AF layers. The angular dependence of HE on the cooling field direction was then studied using VSM. The cooling field was applied at an angle alpha with respect to the twins' perpendicular bisector in the film plane. The most negative HE was found to occur along the AF easy c-axis for 0 < alpha < 30 ~ 40 degrees. An exchange bias flop occurred if alpha was increased further. The 1.0 nm pure FeF2 interface layer resulted in a sharper exchange bias flop transition, indicating that the pure interface layer acts as a buffer for the interface interaction. As a comparison, single crystal FeF2 / Co bilayers were also prepared. A large HE was observed with the sample field-cooled along the easy axis of FeF2, whereas two loops with the same HE magnitude but of opposite signs were observed when the cooling field was applied 90 degrees to the AF easy c-axis. Changing the cooling field direction to 91 degrees caused the sample to acquire a significant positive HE parallel to the AF easy axis, demonstrating that the interface coupling responsible for HE is extremely sensitive to the underlying magnetic anisotropy of the AF layer." @default.
- W2800334001 created "2018-05-17" @default.
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- W2800334001 date "2002-01-01" @default.
- W2800334001 modified "2023-09-26" @default.
- W2800334001 title "Exchange bias and its angular dependence in Fe Zn1- F2/Co bilayers" @default.
- W2800334001 hasPublicationYear "2002" @default.
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