研究了在SrTiO $_{3}$（001）单晶衬底上外延生长的GdBaCo $_{2}$ O $_{5.5+δ}$薄膜的结构和性能。发现薄膜在室温以上具有显著的剩余磁化强度，这比在体材料中观察到的要高得多。透射电子显微镜和X-射线衍射图案显示，在这些薄膜中发生相分离，和负责增强铁磁秩序的相是$a$取向。铁磁有序度的增强是由于Co $^{3+}$在CoO $_{5}$金字塔中的轨道有序度的增强，而铁磁到反铁磁转变的消失则是由于Co $^{3+}$在CoO $_{6}$八面体中的高自旋态的稳定。
英文摘要：
The authors investigated the structure and properties of GdBaCo$_{2}$O$_{5.5+δ}$ thin films epitaxially grown on SrTiO$_{3}$ (001) single crystal substrates. The thin films were found to have a notable remnant magnetization above room temperature, which is much higher than that observed in bulk material. Transmission electron microscopy and x-ray diffraction patterns reveal that phase separation occurs in these films, and the phase responsible for the enhanced ferromagnetic order is $a$-oriented. The enhanced ferromagnetic order is attributed to the enhanced orbital order of Co$^{3+}$ in CoO$_{5}$ pyramids, and the disappearance of ferromagnetic to antiferromagnetic transition is explained the stabilization of higher spin state of Co$^{3+}$ in CoO$_{6}$ octahedra.
Photo-induced Antiferromagnetic-ferromagnetic Transition and Electronic Structure Modulation in GdBaCo$_2$O$_{5.5}$ Thin Film
利用时间分辨X射线磁性圆二色反射谱（XMCDR）和共振磁性X射线衍射（RMXD）研究了强关联氧化物系统GdBaCo $_2$ O $_{5.5}$薄膜的铁磁（FM）和反铁磁（AFM）超快动力学.观察到光致AFM-FM转变，其特征在于瞬态XMCDR超过未泵浦值的增加和RMXD的衰减。瞬态XMCDR和反射率的光子能量依赖性可能被解释为伴随的光诱导自旋态转变。
Transport and magnetic properties of GdBaCo_{2}O_{5+x} single crystals: A cobalt oxide with square-lattice CoO_2 planes over a wide range of electron and hole doping
Co distribution in ferromagnetic rutile Co-doped TiO$_2$ thin films grown by laser ablation on silicon substrates
采用脉冲激光沉积技术在硅基片上制备了金红石型Co掺杂TiO $_2$薄膜。在合适的制备条件下，薄膜中的Co浓度可以与合成靶中的Co浓度基本相同，并且在各种条件下的薄膜在室温以上都具有很好的铁磁性。尽管卢瑟福背散射光谱测量表明Co原子似乎主要位于薄膜表面附近，而较少存在于更深的能级，但其他实验证据表明铁磁性不是来自Co偏析，而是来自Co掺杂的TiO $_2$基质。用简单的方法在廉价的硅衬底上制备了居里温度（TC）在400 K以上的金红石型Ti $_1-x$ Co $_x$ O $_2$薄膜。
Single monolayer ferromagnetic perovskite SrRuO3 with high conductivity and strong ferromagnetism
NTT Basic Research Laboratories, NTT Corporation（NTT基础实验室，NTT公司）；The University of Tokyo（东京大学）；Hiroshima University（广岛大学）；Japan Synchrotron Radiation Research Institute (JASRI)（日本同步辐射研究所）
Depth profile of the ferromagnetic order in a YBa$_2$Cu$_3$O$_7$ / La$_{2/3}$Ca$_{1/3}$MnO$_3$ superlattice on a LSAT substrate: a polarized neutron reflectometry study
Unconventional Magnetization of Fe3O4 Thin Film Grown on Amorphous SiO2 Substrate
采用脉冲激光沉积法在非晶SiO2衬底上制备了（111）取向的高质量单晶Fe 3 O 4薄膜。的薄膜的磁化特性被发现是非常非常规的。由磁化跳变导出的Verwey转变温度在140 K左右，这高于体值，并且它可以被面外磁场略微抑制;面外磁化，这出乎意料地高于面内值，也与体值相比显著增加。我们的研究结果表明，Fe 3d电子的局域库仑关联U和有效铁磁交换相互作用J都被Fe 3 O 4薄膜和非晶SiO2衬底之间的异常耦合显著增强并发生了面外定向纠缠.
