Effective exchange interaction for terahertz spin waves in iron layers

Brandt, Liane; Ritzmann, Ulrike; Liebing, Niklas; Ribow, Mirko; Razdolski, Ilya; Brouwer, Piet W.; Melnikov, Alexey; Woltersdorf, Georg

doi:10.1103/physrevb.104.094415

Cited by 10 publications

(6 citation statements)

References 29 publications

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“…( 1)] and only consider free uniform precession. In particular, we neglect effects such as perpendicular standing spin waves, attenuation and nutation [28,43,44]. In the frequency domain, the resulting out-of-plane magnetization component is given by the Fourier transformation of Eq.…”

Section: Appendix B Zeeman Detector Calibrationmentioning

confidence: 99%

Ultrafast Demagnetization of Iron Induced by Optical versus Terahertz Pulses

et al. 2021

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Section: Appendix B Zeeman Detector Calibrationmentioning

confidence: 99%

Ultrafast Demagnetization of Iron Induced by Optical versus Terahertz Pulses

et al. 2021

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“…Our work demonstrates the coupling of terahertz light with magnon modes of corresponding energy. Unlike optically induced spin waves [9][10][11][12][13][14] , this terahertz-frequency magnon excitation via SOT is linear with the amplitude of the terahertz field, which allows us to achieve coherent and efficient control over the excitation, which is of much fundamental and applied interest. Furthermore, the layered metallic stacks based on an encapsulated ferromagnetic thin film act as an intrinsic terahertz magnon source at zero magnetic field, and offer low-cost fabrication and easy integration into existing technologies [47][48][49] , thus opening an attractive pathway towards low-power terahertz-frequency magnonics and spintronics at the nanoscale.…”

Section: Articlementioning

confidence: 99%

“…Terahertz spin pumping via antiferromagnetic magnon excitations can also be realized, as demonstrated recently 7,8 . To generate resonant excitations at terahertz frequencies in technologically relevant metallic ferromagnets, high-energy spin waves have been proposed [9][10][11][12][13][14] . In these studies, nanoscale-wavelength spin waves are launched by making use of laser-pulse-driven spin currents-that is, optically induced spin-polarized electrons that move Article https://doi.org/10.1038/s41567-022-01908-1…”

mentioning

confidence: 99%

“…As a result, an interface-localized broadband wave packet of nanometre-wavelength magnons launches from the top surface into the depth of the ferromagnetic layer 11 , followed by its reflection at the layer's bottom surface. This finally results in perpendicular standing spin waves (PSSW), which are detected by using magneto-optical techniques [9][10][11][12][13][14] .…”

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confidence: 99%

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Coupling of terahertz light with nanometre-wavelength magnon modes via spin–orbit torque

et al. 2023

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Spin-based technologies can operate at terahertz frequencies but require manipulation techniques that work at ultrafast timescales to become practical. For instance, devices based on spin waves, also known as magnons, require efficient generation of high-energy exchange spin waves at nanometre wavelengths. To achieve this, a substantial coupling is needed between the magnon modes and an electro-magnetic stimulus such as a coherent terahertz field pulse. However, it has been difficult to excite non-uniform spin waves efficiently using terahertz light because of the large momentum mismatch between the submillimetre-wave radiation and the nanometre-sized spin waves. Here we improve the light–matter interaction by engineering thin films to exploit relativistic spin–orbit torques that are confined to the interfaces of heavy metal/ferromagnet heterostructures. We are able to excite spin-wave modes with frequencies of up to 0.6 THz and wavelengths as short as 6 nm using broadband terahertz radiation. Numerical simulations demonstrate that the coupling of terahertz light to exchange-dominated magnons originates solely from interfacial spin–orbit torques. Our results are of general applicability to other magnetic multilayered structures, and offer the prospect of nanoscale control of high-frequency signals.

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“…In this work, we will make use of optically induced spin currents that are generated by a neighboring ferromagnet upon ultrafast demagnetization [15][16][17][18]. The optically induced spin-transfer torques (OSTTs) generated in this manner have been used to excite exchange-dominated standing spin waves with frequencies exceeding 1 THz [19][20][21]. Moreover, it has been shown that such spin currents can be used * j.hintermayr@tue.nl to assist in single-shot all-optical switching of ferrimagnets [22,23] or even induce full switching in ferromagnets [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Exploring terahertz-scale exchange resonances in synthetic ferrimagnets with ultrashort optically induced spin currents

2023

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show abstract

Effective exchange interaction for terahertz spin waves in iron layers

Cited by 10 publications

References 29 publications

Ultrafast Demagnetization of Iron Induced by Optical versus Terahertz Pulses

Ultrafast Demagnetization of Iron Induced by Optical versus Terahertz Pulses

Coupling of terahertz light with nanometre-wavelength magnon modes via spin–orbit torque

Exploring terahertz-scale exchange resonances in synthetic ferrimagnets with ultrashort optically induced spin currents

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