Fully resonant magneto-elastic spin-wave excitation by surface acoustic waves under conservation of energy and linear momentum

Geilen, Moritz; Nicoloiu, Alexandra; Narducci, Daniele; Mohseni, Morteza; Ender, Milan; Ciubotaru, Florin; Müller, A.; Hillebrands, B.; Adelmann, Christoph; Pirro, Philipp

doi:10.1063/5.0088924

Cited by 12 publications

(8 citation statements)

References 37 publications

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“…Nevertheless, quasi wide-band characterization of nonreciprocal magnetoacoustic waves with IDTs has also been demonstrated [30,36]. In addition to the IDT-based excitation and detection of magnetoacoustic waves discussed above, the coupling between electrically or thermally excited SAWs with SWs has been characterized by optical measures such as Brillouin light scattering (BLS) [44][45][46][47]…”

Section: Phenomenology Of the Magnetoacoustic Interactionmentioning

confidence: 99%

Chiral Magnetoacoustics

2022

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Nonreciprocal microwave devices are key components of communication platforms. Nonreciprocity can arise in chiral systems, where chirality refers to a fixed handedness that is preserved under time reversal. Chiral excitations (quasiparticles) provide opportunities for the realization of miniaturized microwave components with directional properties. In particular, surface acoustic waves that propagate in magnetic media are chiral and can display pronounced nonreciprocal character. Because surface acoustic waves are an established technological platform, hybrid surface acoustic wave/spin wave devices have great application potential. In this mini-review, we introduce the general concept of chiral and nonreciprocal magnetoacoustic waves. We discuss a widely employed phenomenological model based on magnetoelastic coupling and magneto-rotation that quantitatively accounts for many experimental findings and give a brief overview over selected experiments and advances in this emerging research field.

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Section: Phenomenology Of the Magnetoacoustic Interactionmentioning

confidence: 99%

Chiral Magnetoacoustics

2022

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“…14,19,20,32,33 Resonant magnetoacoustic interaction is possible if the wave vector k and frequency f of the SAW and SW match. 34,35 Hereby, the dispersion f(k) of SAWs is usually linear, while the dispersion of SWs can be more complicated, as schematically depicted in Figures 1b−d. Resonant SW excitation with SAWs results in a drop in the SAW transmission amplitude because of energy conservation.…”

Section: ■ Introductionmentioning

confidence: 99%

Wide-Band Nonreciprocal Transmission of Surface Acoustic Waves in Synthetic Antiferromagnets

Küß,

Glamsch,

Hörner

et al. 2024

ACS Appl. Electron. Mater.

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The coupling between surface acoustic waves (SAWs) and spin waves (SWs) in piezoelectric/magnetic heterostructures holds potential for the realization of novel microwave devices. Since SAWs are inherently reciprocal, the nonreciprocity arising from magnetoacoustic interaction is of particular interest. Large nonreciprocal SAW transmission in a limited frequency range near the intersection point of the SAW and SW dispersions has been recently reported in several studies. Here, we demonstrate that the nonreciprocal SW dispersion of a CoFeB(16 nm)/Ru(0.55 nm)/CoFeB(14 nm) synthetic antiferromagnet (SAF) can be adjusted to match the linear dispersion of the SAW in a wide range of frequencies f. Therefore, the SAW transmission is nonreciprocal for 2.8 GHz < f < 7.0 GHz with low losses (<0.08 dB) mediated by SAW-SW interaction in the forward direction and large attenuation (>5 dB) in the reverse direction. These results hold great potential for the realization of devices allowing wide-band nonreciprocal signal transmission.

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“…The coupling between surface acoustic waves (SAWs) and spin waves (SWs) holds potential for the realization of novel microwave devices and applications in magnonics. Large SAW manipulation − and SW excitation − have been demonstrated in magnetoacoustic devices, consisting of a piezoelectric substrate and a magnetic thin film, as illustrated in Figure a. These devices benefit from low-loss excitation and detection of SAWs with metallic grating structuresso-called interdigital transducers (IDTs)on piezoelectric crystals. , Surface acoustic waves are already widely employed in modern technology, such as in rf bandpass filters in cellphones, − sensors, , and lab-on-a-chip applications, thanks to mass fabrication capabilities and small device geometry.…”

Section: Introductionmentioning

confidence: 99%

Giant Surface Acoustic Wave Nonreciprocity with Low Magnetoacoustic Insertion Loss in CoFeB/Ru/CoFeB Synthetic Antiferromagnets

Küß,

Glamsch,

Kunz

et al. 2023

ACS Appl. Electron. Mater.

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In this study, we optimize the nonreciprocal transmission of surface acoustic waves (SAWs) in a piezoelectric/ magnetic heterostructure loaded with a CoFeB(d A )/Ru(0.55 nm)/ CoFeB(d B ) synthetic antiferromagnet (SAF). The SAF is composed of two ferromagnetic layers separated by a thin nonmagnetic Ru spacer layer, providing strong antiferromagnetic interlayer exchange coupling. The optical spin wave (SW) mode shows a large nonreciprocal dispersion relation in conjunction with a narrow line width. Therefore, for oppositely propagating SAWs, the SAW-SW resonances can become fully separated. For the optimized CoFeB(16 nm)/Ru(0.55 nm)/CoFeB(5 nm) SAF, we demonstrate both, a giant nonreciprocal SAW transmission of ΔS ± /l f > 250 dB/mm and a very low magnetoacoustic insertion loss of IL Δ /l f < 1 dB/mm per length l f of the SAF in the acoustic path at frequencies above 5 GHz. These results yield the potential for the realization of novel microwave devices with nonreciprocal signal transmission, such as acoustic isolators. In addition, the experimental results are in excellent agreement with a phenomenological model that considers the dipolar fields of the SWs and takes the bilinear and biquadratic interlayer exchange coupling into account.

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Fully resonant magneto-elastic spin-wave excitation by surface acoustic waves under conservation of energy and linear momentum

Cited by 12 publications

References 37 publications

Chiral Magnetoacoustics

Chiral Magnetoacoustics

Wide-Band Nonreciprocal Transmission of Surface Acoustic Waves in Synthetic Antiferromagnets

Giant Surface Acoustic Wave Nonreciprocity with Low Magnetoacoustic Insertion Loss in CoFeB/Ru/CoFeB Synthetic Antiferromagnets

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