Canted standing spin-wave modes of permalloy thin films observed by ferromagnetic resonance

Dąbrowski, Maciej; Hicken, Robert J.; Frisk, Andreas; Newman, David G.; Klewe, Christoph; N’Diaye, Alpha T.; Shafer, Padraic; van der Laan, Gerrit; Hesjedal, Thorsten; Bowden, Graham J.

doi:10.1088/1367-2630/abdd6b

Canted standing spin-wave modes of permalloy thin films observed by ferromagnetic resonance

Journal Article · Fri Feb 12 00:00:00 EST 2021 · New Journal of Physics

DOI:https://doi.org/10.1088/1367-2630/abdd6b· OSTI ID:1810807

^[1]; Hicken, Robert J. ^[1]; ^[2]; ^[1]; Klewe, Christoph ^[3]; N’Diaye, Alpha T. ^[3]; Shafer, Padraic ^[3]; van der Laan, Gerrit ^[2]; ^[4]; Bowden, Graham J. ^[5]

Univ. of Exeter (United Kingdom)
Science and Technology Facilities Council (STFC), Oxford (United Kingdom). Diamond Light Source, Ltd.
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Univ. of Oxford (United Kingdom). Clarendon Lab.
Univ. of Southampton (United Kingdom)

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Engineering and Physical Sciences Research Council (EPSRC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1810807

Alternate ID(s):: OSTI ID: 23177805

Journal Information:: New Journal of Physics, Journal Name: New Journal of Physics Journal Issue: 2 Vol. 23; ISSN 1367-2630

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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