Cansever Hamza, Anwar Md Shadab, Stienen Sven, Lenz Kilian, Narkowicz Ryszard, Hlawacek Gregor, Potzger Kay, Hellwig Olav, Fassbender Jürgen, Lindner Jürgen, Bali Rantej
Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328, Dresden, Germany.
Institute of Solid State and Materials Physics, Technische Universität Dresden, 01069, Dresden, Germany.
Sci Rep. 2022 Aug 31;12(1):14809. doi: 10.1038/s41598-022-15959-0.
The ferromagnetic resonance of a disordered A2 FeAl ferromagnetic stripe, of dimensions 5 µm × 1 µm × 32 nm, has been observed in two vastly differing surroundings: in the first case, the ferromagnetic region was surrounded by ordered B2 FeAl, and in the second case it was free standing, adhering only to the oxide substrate. The embedded ferromagnet possesses a periodic magnetic domain structure, which transforms to a single domain structure in the freestanding case. The two cases differ in their dynamic response, for instance, the resonance field for the uniform (k = 0) mode at ~ 14 GHz excitation displays a shift from 209 to 194 mT, respectively for the embedded and freestanding cases, with the external magnetic field applied along the long axis. The resonant behavior of a microscopic ferromagnet can thus be finely tailored via control of its near-interfacial surrounding.
在两种截然不同的环境中观察到了尺寸为5 µm×1 µm×32 nm的无序A2 FeAl铁磁条纹的铁磁共振：在第一种情况下，铁磁区域被有序的B2 FeAl包围，在第二种情况下，它是独立的，仅附着在氧化物衬底上。嵌入的铁磁体具有周期性磁畴结构，在独立情况下会转变为单畴结构。这两种情况在动态响应方面有所不同，例如，在约14 GHz激发下，沿长轴施加外部磁场时，均匀（k = 0）模式的共振场在嵌入和独立情况下分别从209 mT移至194 mT。因此，微观铁磁体的共振行为可以通过控制其近界面环境进行精细调整。
