Anisotropic bimodal distribution of blocking temperature with multiferroic BiFeO 3 epitaxial thin films
Résumé
Controlling BiFeO3 (BFO)/ferromagnet (FM) interfacial coupling appears crucial for electrical
control of spintronic devices using this multiferroic. Here, we analyse the magnetic behaviour of
exchange-biased epitaxial-BiFeO3/FM bilayers with in-plane or out-of-plane magnetic
anisotropies. We report bimodal distributions of blocking temperatures similar to those of
polycrystalline-antiferromagnet (AF)/FM bilayers. The high-temperature contribution depends on
the FM anisotropy direction and is likely related to thermally activated depinning of domain walls
in the BiFeO3 single crystal film as opposed to thermally activated reversal of spins in AF grains
for polycrystalline AF. In contrast, the low-temperature contribution weakly depends on the
anisotropy direction, consistent with a spin-glass origin.
Domaines
Matière Condensée [cond-mat]| Origine | Fichiers éditeurs autorisés sur une archive ouverte |
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