Direct Observation of Spin Wave Resonance

Seavey, M. H.; Tannenwald, P. E.

doi:10.1063/1.2185900

Cited by 85 publications

(19 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…At the same time, higher order perpendicular standing spin-wave modes observed for the case of laterally uniform precession "# $% → ' [33,34] are predicted to extend to the regime of laterally propagating dipole-exchange waves of finite # $% . We therefore analytically calculated [27] (cf.…”

mentioning

confidence: 89%

See 1 more Smart Citation

Coherent Excitation of Heterosymmetric Spin Waves with Ultrashort Wavelengths

et al. 2019

View full text Add to dashboard Cite

In the emerging field of magnonics, spin waves are foreseen as signal carriers for future spintronic information processing and communication devices, owing to both the very low power losses and a high device miniaturization potential predicted for short-wavelength spin waves. Yet, the efficient excitation and controlled propagation of nanoscale spin waves remains a severe challenge. Here, we report the observation of high-amplitude, ultrashort dipole-exchange spin waves (down to 80 nm wavelength at 10 GHz frequency) in a ferromagnetic single layer system, coherently excited by the driven dynamics of a spin vortex core. We used time-resolved x-ray microscopy to directly image such propagating spin waves and their excitation over a wide range of frequencies. By further analysis, we found that these waves exhibit a heterosymmetric mode profile, involving regions with anti-Larmor precession sense and purely linear magnetic oscillation. In particular, this mode profile consists of dynamic vortices with laterally alternating helicity, leading to a partial magnetic flux closure over the film thickness, which is explained by a strong and unexpected mode hybridization. This spin-wave phenomenon observed is a general effect inherent to the dynamics of sufficiently thick ferromagnetic single layer films, independent of the specific excitation method employed.

show abstract

mentioning

confidence: 89%

“…where higher order perpendicular standing waves solely occur at frequencies above that of the uniform precession and the quasi-uniform propagation, respectively [33,34].…”

mentioning

confidence: 99%

Coherent Excitation of Heterosymmetric Spin Waves with Ultrashort Wavelengths

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Both the Kittel mode (black) and the PSSW (gray) display the expected evolution with the thickness: while the frequency of uniform precession ω K remains unchanged, the frequency of the PSSW reduces. Being proportional to t −2 it approaches ω K in accordance to literature [ST58]. 1 The DE modes (blue lines and points in figure 2.3) have been predominantly studied with BLS [GMVG82].…”

Section: Resultssupporting

confidence: 79%

“…Perpendicular standing spin waves with n = 1 can also be identified (gray) and fit well to the expected t −2 behavior[ST58]. PSSW of second order are not observed (dashed gray line), instead Damon-Eshbach surface waves (blue) are excited.…”

supporting

confidence: 60%

Photo-magnonics in two-dimensional antidot lattices

Lenk¹

View full text Add to dashboard Cite

The spin-wave relaxation mechanisms after intense laser excitation in ferromagnetic nickel films are investigated with all-optical pump-probe experiments. Uniform precession (Kittel mode), Damon-Eshbach surface modes and perpendicular standing spin waves can be identified by their dispersion ω(H ext ). However, different to other ferromagnets ω(H ext ) deviates from the expected behavior. Namely, a mode discontinuity is observed, that can be attributed to a non-linear process. Above a critical field the power spectrum reveals a redistribution of the energy within the spin-wave spectrum populated.

show abstract

“…Введение. Возможность возбуждения стоячих спиновых волн (спин-волновой резонанс) однородным переменным магнитным полем предсказал Киттель [1] и экспериментально подтвердили Сиви и Танненвальт на плёнках пермаллоя [2]. Киттель первым обратил внимание на то, что в тонких ферромагнитных образцах существует сильная поверхностная анизотропия.…”

unclassified