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Phase Transition-Induced Modulation of Exchange Bias in Fe/BiFeO_3 Bilayers

机译：Fe / BiFeO_3双层中相变诱导的交换偏置调制

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摘要

Many of researches indicate that epitaxial BiFeO3 (BFO) films deposited on LaAlO3 (LAO) substrate undergo strain-driven phase transition from a tetragonal-like phase (T-BFO) to a rhombohedral-like phase (R-BFO), and a mixed phase (M-BFO) that T-BFO coexists with R-BFO forms in the phase transition process. It is necessary to explore how BFO phase transition affects the exchange bias in ferromagnet (FM)/BFO bilayers. In our studies, aforementioned BFO phase transition is accomplished by varying BFO films thickness. Using 5 nm-thick Fe as ferromagnetic layer deposited on 9-354 nm-thick BFO as antiferromagnetic layer, the exchange bias in Fe/BFO bilayers exhibits that Fe/M-BFO bilayers shows smaller exchange bias than Fe/T-BFO and Fe/R-BFO bilayers. We ascribed the effect of the BFO phase transition on the exchange bias to the domain walls caused by the exchange interaction between T-BFO and R-BFO across their boundaries. Additionally, for the same reason, the coercivity also exhibits the same variation trend as the exchange bias does. Our studies will help to promote the application of controlling the ferromagnetic magnetization by the electric field.
机译：许多研究表明，沉积在LaAlO3（LAO）衬底上的外延BiFeO3（BFO）膜经历了应变驱动的相变，从四方相（T-BFO）转变为菱面体相（R-BFO），并且混合T-BFO与R-BFO共存的相（M-BFO）在相变过程中形成。有必要探讨BFO相变如何影响铁磁体（FM）/ BFO双层中的交换偏压。在我们的研究中，上述BFO相变是通过改变BFO膜的厚度来完成的。使用5 nm厚的Fe作为铁磁层，沉积在9-354 nm厚的BFO作为反铁磁层上，Fe / BFO双层中的交换偏压显示Fe / M-BFO双层显示的交换偏压比Fe / T-BFO和Fe / R-BFO双层。我们将BFO相变对T-BFO和R-BFO跨越边界的交换相互作用引起的对畴壁的交换偏置的影响归因于。另外，由于相同的原因，矫顽力也表现出与交换偏压相同的变化趋势。我们的研究将有助于促进通过电场控制铁磁磁化的应用。

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