期刊
NEW JOURNAL OF PHYSICS
卷 23, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1367-2630/abdd6b
关键词
ferromagnetic resonance; standing spin waves; XFMR; canted magnetization; exchange spring magnet
资金
- Engineering and Physical Sciences Research Council (EPSRC) [EP/P021190/1, EP/P020151/1, EP/P02047X/1]
- DOE Office of Science User Facility [DE-AC02-05CH11231]
- EPSRC Centre for Doctoral Training in Metamaterials [EP/L015331/1]
- EPSRC [EP/P020151/1, 2089989, EP/P021190/1, EP/P02047X/1] Funding Source: UKRI
Non-collinear spin structures in [Co/Pt]/Pt/Py films with an additional Pt spacer for coupling control were studied using VNA-FMR and XFMR techniques. Results showed slight pinning of Py dynamic magnetization by [Co/Pt], with observation of PSSW, CSSW, and HSSW states morphing under reduced magnetic field. The CSSW modes are particularly relevant for microwave assisted magnetic recording applications.
Non-collinear spin structures in materials that combine perpendicular and in-plane magnetic anisotropies are of great technological interest for microwave and spin wave-assisted magnetization switching. [Co/Pt] multilayers are well-known perpendicular anisotropy materials that have the potential to pin the magnetization of a soft magnetic layer, such as permalloy (Py), that has in-plane anisotropy, thereby forming a magnetic exchange spring. Here we report on multilayered [Co/Pt]/Pt/Py films, where an additional ultrathin Pt spacer has been included to control the coupling between the sub-units with in-plane and perpendicular magnetic anisotropy. Vector network analyser (VNA)-ferromagnetic resonance (FMR) measurements were made to obtain a complete picture of the resonant conditions, while the dynamical response of the sub-units was probed by synchrotron-based element- and phase selective x-ray detected FMR (XFMR). For all samples, only slight pinning of the dynamic magnetization of the Py by the [Co/Pt] was noted, and the FMR results were dominated by the 50 nm thick Py layer. Out-of-plane VNA-FMR maps reveal the presence of additional modes, e.g. a perpendicular standing spin-wave (PSSW) state. However, as the magnetic field is reduced below the saturation field, the PSSW state morphs continuously through a series of canted standing spin-wave (CSSW) states into a horizontal standing spin-wave (HSSW) state. The PSSW, CSSW and HSSW states are well described using a multilayer model of the Py film. The observation of CSSW modes is of particular relevance to microwave assisted magnetic recording, where microwave excitation stimulates precession of a soft layer canted out of plane by a pulsed magnetic field.
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