Abstract We investigate the effects of biaxial compressive and tensile strain on the magnetic and structural properties of BaFeO3-δ (BFO), BaFe0.9Ti0.1O3-δ (BFTO) and BaFe0.9Ru0.1O3-δ (BFRO) thin films fabricated on SrTiO3 (0 0 1) (STO) and MgO (0 0 1). The magnetization measurements show a long range ferromagnetic ordering in compressive strained BFO thin film while an antiferromagnetic ordering with weak ferromagnetism appears in tensile strained BFO thin film. This behavior is ascribed to the difference in oxygen stoichiometry under the two strain states in the BFO thin films. Ti4+ (3d0) and Ru4+ (4d5) ion substitutions at B-site cause an increase in unit cell volume irrespective of the strain type resulting in relaxation of tensile strain and enhancement of compressive strain. This B-site disorder leads to collapse of long range ferromagnetic ordering in BFTO and BFRO thin films grown on STO but an increased ferromagnetic ordering comes along in BFTO and BFTRO thin films on MgO. The contrasting results portray that tensile strain suppresses the effect of cation disorder evident under compressive strain, on the magnetic and structural properties of BFO, BFTO and BFRO thin films.

中文翻译：

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失配应变对未掺杂和掺杂 BaFeO3-δ 薄膜磁行为的对比影响

摘要 我们研究了双轴压缩和拉伸应变对 BaFeO3-δ (BFO)、BaFe0.9Ti0.1O3-δ (BFTO) 和 BaFe0.9Ru0.1O3-δ (BFRO) 薄膜的磁性和结构特性的影响。 SrTiO3 (0 0 1) (STO) 和 MgO (0 0 1)。磁化测量显示压缩应变 BFO 薄膜中存在长程铁磁有序，而拉伸应变 BFO 薄膜中出现具有弱铁磁性的反铁磁有序。这种行为归因于 BFO 薄膜中两种应变状态下氧化学计量的差异。无论应变类型如何，B 位的 Ti4+ (3d0) 和 Ru4+ (4d5) 离子取代都会导致晶胞体积增加，从而导致拉伸应变松弛和压缩应变增强。这种 B 位无序导致在 STO 上生长的 BFTO 和 BFRO 薄膜中的长程铁磁有序崩溃，但在 MgO 上的 BFTO 和 BFTRO 薄膜中铁磁有序会增加。对比结果表明，拉伸应变抑制了在压缩应变下明显的阳离子无序对 BFO、BFTO 和 BFRO 薄膜的磁性和结构特性的影响。