ACS Applied Materials & Interfaces
ACS Applied Materials & Interfaces
3 years ago

Self-Poling-Induced Magnetoelectric Effect in Highly Strained Epitaxial BiFeO3/La0.67Sr0.33MnO3−δ Multiferroic Heterostructures

Self-Poling-Induced Magnetoelectric Effect in Highly Strained Epitaxial BiFeO3/La0.67Sr0.33MnO3−δ Multiferroic Heterostructures
Chao Jin, Wanchao Zheng, Junlu Gong, Dongxing Zheng, Haili Bai, Dong Li
Highly strained epitaxial BiFeO3/La0.67Sr0.33MnO3−δ (BFO/LSMO) heterostructures were fabricated on LaAlO3 substrates by magnetron sputtering. The as-grown downward self-polarization of BFO capping layers was confirmed by piezoelectric force microscopy. Using the electrostatic field-induced charge screening, a hole depletion state was induced in ultrathin (8 nm) LSMO films. As a result of the interfacial charge coupling, appreciable saturated magnetization (MS) increase of about 500 and 100% can be observed in LSMO with BFO capping at 5 and 300 K, respectively. Besides, LSMO phase translations can be revealed by the BFO thickness-related exchange bias field (HE) and MS of the BFO/LSMO heterostructures. The results established a new approach in achieving interfacial magnetoelectric couplings with thin self-polarized multiferroic layers.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b05803

DOI: 10.1021/acsami.7b05803

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