Phase separation in the perovskite manganites of R_1‐xA_xMnO₃ (R = trivalent lanthanide cation and A = divalent alkaline‐earth cation) can induce novel phenomena associated with the interfacial interactions. Here, the occurrence of phase separation and unexpected exchange bias induced by electron beam irradiation (EBI) in the epitaxial LaMnO_3+δ (LMO) thin films is reported. The transformation from Mn⁴⁺ ion to Mn³⁺ ion originating from the electron's reducibility, enhances the Mn³⁺–Mn³⁺ antiferromagnetic superexchange interaction, resulting in phase separation, namely, the coexistence of ferromagnetic matrix and antiferromagnetic clusters. The formation of the antiferromagnetic phase in the LMO film is closely related to the increase of the out‐of‐plane lattice constant and the decrease of Curie temperature after EBI. The unexpected exchange bias effect results from the interfacial interaction between the ferromagnetic matrix and antiferromagnetic clusters, triggered by EBI in LMO film. The discovery of exchange bias induced by EBI shed promising light on achieving the tunable exchange bias effect in spintronic devices for single‐phase films.

中文翻译：

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电子束辐照引起的外延LaMnO3 +δ薄膜的交换偏置效应

R _{1 x} A _x MnO ₃的钙钛矿锰矿中的相分离（R =三价镧系阳离子和A =二价碱土阳离子）可引发与界面相互作用有关的新现象。在此，报告了在外延LaMnO _{3 +δ}（LMO）薄膜中由于电子束辐照（EBI）引起的相分离和意外的交换偏压的发生。由电子的还原性引起的从Mn ⁴⁺离子到Mn ³⁺离子的转变增强了Mn ³⁺ -Mn ³⁺反铁磁超交换相互作用，导致相分离，即铁磁基质和反铁磁团簇共存。LMO膜中反铁磁相的形成与平面外晶格常数的增加和EBI后居里温度的降低密切相关。LMO薄膜中的EBI触发了铁磁性基质与反铁磁性团簇之间的界面相互作用，从而产生了意料之外的交换偏置效应。EBI引起的交换偏压的发现为在单相膜自旋电子器件中实现可调节的交换偏压效果提供了希望的光明。