Quenching of the Exchange Bias Training in Fe/Cr{sub 2}O{sub 3}/Fe Trilayer
- Department of Physics and Astronomy and the Nebraska Center for Materials and Nanoscience, University of Nebraska, Lincoln, Nebraska 68588-0111 (United States)
Exchange bias (EB) and its associated training effects are studied in an epitaxial Fe(10 nm)/Cr{sub 2}O{sub 3}(2.7 nm)/Fe(10 nm) trilayer heterostructure grown by molecular beam epitaxy. The EB decreases linearly with increasing temperature from T = 5 K to T = 50 K. It changes sign and becomes positive within 50 K < T < 200 K, finally changing back to regular EB for T<200K up to the highest measured temperature of T = 395 K. Remarkably, the latter is far above the bulk Neel temperature TN = 307 K. EB training effects occur only at 5 K < T < 50 K. We show that this training can be quenched by subjecting the system to DC magnetic field, {mu}{sub 0}H{sub DC} {<=} 7 T. The applied field most likely induces a temperature dependent spin-flop transition. Upon its removal the antiferromagnetic Cr{sub 2}O{sub 3} pinning layer evolves uniformly into its quasi-equilibrium spin configuration thus leading to quasi-equilibrium EB.
- OSTI ID:
- 21251593
- Journal Information:
- AIP Conference Proceedings, Vol. 1063, Issue 1; Conference: IWMNMM-2008: International workshop on mesoscopic, nanoscopic and macroscopic materials, Bhubaneswar (India), 2-4 Jan 2008; Other Information: DOI: 10.1063/1.3027152; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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