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Exchange Bias in La0.67Sr0.33MnO3/YFeO3 Ferromagnet/Antiferromagnet Multilayer Heterostructures
Paul Fourmont1,2, Eunsoo Cho2, Sylvain G Cloutier1
1École de Technologie Supérieure, Department of Electrical Engineering, 1100 Notre Dame Street West, Montreal, Quebec, H3C 1K3, Canada.
None:
Exchange bias (EB), manifested as a hysteresis-loop offset after field-cooling, is demonstrated in perovskite-structured ferromagnet/antiferromagnet (La0.67Sr0.33MnO3/YFeO3)n heterostructures grown on (100) SrTiO3 substrates. Bilayer samples show an EB of 306 Oe at 50 K, whereas multilayers with five layers exhibit an exchange bias of up to 424 Oe at 50 K. A spin valve consisting of La0.67Sr0.33MnO3/SrTiO3/La0.67Sr0.33MnO3/YFeO3 shows stable remanent configurations resulting from pinning of the upper La0.67Sr0.33MnO3 layer by the YFeO3. In contrast, EB is not observed on (111)-oriented SrTiO3 substrates due to interface roughening. These results demonstrate YFeO3 as an alternative orthoferrite antiferromagnet compared to BiFeO3 and LaFeO3 for incorporation into exchange-biased heterostructures.
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