This paper describes manipulation of the antiferromagnetic (AFM) moment by external magnetic field in thin epitaxial nanofilms of $\alpha \text{−}{\mathrm{Fe}}_2{\mathrm{O}}_3$—the iron oxide polymorph known for its canted antiferromagnetism above the Morin temperature. The field-driven rotation of the AFM moment has been detected in thin $\alpha \text{−}{\mathrm{Fe}}_2{\mathrm{O}}_3$/GaN layers by monitoring the azimuthal field dependence of the x-ray magnetic linear dichroism line shape at $L_{23}$ absorption edge of iron. The presence of the tiny canted ferrimagnetic (FM) moment in $\alpha \text{−}{\mathrm{Fe}}_2{\mathrm{O}}_3$ makes it possible to manipulate the related AFM moment by applying external magnetic field, monitoring the field-driven rotation of both AFM and FM moments that otherwise can be hardly detected in a nanoscale film by conventional magnetometry. A controllable manipulation of the AFM moment in a thin film by external magnetic field is supposed to be an important keystone for development of the emerging field of AFM spintronics.

中文翻译：

---

外延α-Fe2O3薄膜中场操纵倾斜反铁磁性的X射线磁性线性二向色性研究

本文描述了外磁场对薄膜外延纳米膜中反铁磁（AFM）矩的操纵。 $\alpha \text{-}{铁}_{\mathrm{2个}}{\mathrm{Ø}}_3$-氧化铁多晶型物，其在Morin温度以上具有倾斜的反铁磁性。在薄层中检测到了AFM力矩的场驱动旋转$\alpha \text{-}{铁}_{\mathrm{2个}}{\mathrm{Ø}}_3$/ GaN层，通过监测x射线磁性线性二向色性线形在20°C时的方位角场依赖性 ${\mathrm{大号}}_{23}$铁的吸收边缘。微小倾斜铁磁（FM）矩的存在$\alpha \text{-}{铁}_{\mathrm{2个}}{\mathrm{Ø}}_3$通过施加外部磁场，监测AFM和FM力矩的场驱动旋转，可以通过传统的磁力技术在纳米级薄膜中很难检测到相关的AFM力矩。外界磁场对薄膜中AFM力矩的可控控制被认为是AFM自旋电子学新兴领域发展的重要基石。