Nair Akash, Wollstadt Stephan, Witte Ralf, Dasgupta Supratik, Kehne Philipp, Alff Lambert, Komissinskiy Philipp, Clemens Oliver
Technische Universität Darmstadt, Institute of Materials Science, Materials Design by Synthesis Division Alarich-Weiss-Straße 2 64287 Darmstadt Germany
Karlsruhe Institute of Technology, Institute of Nanotechnology Hermann-von-Helmholtz-Platz 1 76344 Eggenstein Leopoldshafen Germany.
RSC Adv. 2019 Nov 13;9(64):37136-37143. doi: 10.1039/c9ra08039b.
In this article, we report on the synthesis and characterisation of fluorinated epitaxial films of BaFeOF low-temperature fluorination of thin films of BaFeO grown by pulsed laser deposition. Diffraction measurements show that fluoride incorporation only results in a contraction of the film perpendicular to the film surface, where clamping by the substrate is prohibitive for strong in-plane changes. The fluorinated films were found to be homogenous regarding the fluorine content over the whole film thickness, and can be considered as single crystal equivalents to the bulk phase BaFeOF. Surprisingly, fluorination resulted in the change of the tetragonal distortion to a nearly cubic symmetry, which results in a lowering of anisotropic orientation of the magnetic moments of the antiferromagnetically ordered compound, confirmed by Mössbauer spectroscopy and magnetic studies.
在本文中，我们报道了通过脉冲激光沉积生长的BaFeO薄膜的低温氟化制备BaFeOF氟化外延薄膜及其表征。衍射测量表明，氟的掺入仅导致薄膜在垂直于薄膜表面方向上的收缩，而由于衬底的限制，面内的强烈变化受到抑制。研究发现，氟化薄膜在整个薄膜厚度上的氟含量是均匀的，可被视为体相BaFeOF的单晶等效物。令人惊讶的是，氟化导致四方畸变转变为近乎立方对称，这使得反铁磁有序化合物的磁矩各向异性取向降低，这一结果通过穆斯堡尔光谱和磁性研究得到证实。
