Temperature dependent inverse spin Hall effect in Co/Pt spintronic emitters

Matthiesen, Mattias; Afanasiev, D.; Hortensius, J. R.; Thiel, Thierry C. van; Medapalli, Rajasekhar; Fullerton, Eric E.; Caviglia, Andrea D.

doi:10.1063/5.0010219

Cited by 19 publications

(31 citation statements)

References 28 publications

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“…( 1) also applies to this metallic bilayer as it relies on the spin-to-charge conversion in Pt to generate THz emission. In agreement with a previous report 39 , the amplitude of the THz pulse decreases with decreasing temperature and reaches a plateau at 50 K (Fig. 3d).…”

supporting

confidence: 93%

“…3d). This behaviour, which is associated with the intrinsic components of the spin Hall effect in Pt 39 , significantly differs to what is observed in our YIG|Pt sample, allowing us to exclude the influence of the Pt layer in our measured temperature dependence of the LSSE. We conclude therefore that our measurement probes the temperature dependence of the spin mixing conductance.…”

contrasting

confidence: 58%

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Temperature dependence of the picosecond spin Seebeck effect

Kholid

Hamara

Terschanski

et al. 2021

Applied Physics Letters

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We performed temperature-dependent optical pump -THz emission measurements in Y3Fe5O12 (YIG)|Pt from 5 K to room temperature in the presence of an externally applied magnetic field. We study the temperature dependence of the spin Seebeck effect and observe a continuous increase as temperature is decreased, opposite to what is observed in electrical measurements where the spin Seebeck effect is suppressed as 0 K is approached. By quantitatively analysing the different contributions we isolate the temperature dependence of the spin-mixing conductance and observe features that are correlated to the bands of magnon spectrum in YIG.The longitudinal spin Seebeck effect (LSSE) 1 describes the transfer of a spin current from a magnetic insulator driven by a temperature gradient. An adjacent heavy metal (HM) layer with large spin orbit coupling is typically used to convert the spin current into an electrical signal via the inverse spin Hall effect (ISHE). 2,3 The LSSE has been measured in a variety of different materials such as ferromagnets 1,4,5 , anti-ferromagnets 6,7 and paramagnets. 8 Magnetic insulators (MI) such as Y3Fe5O12 (Yttrium Iron Garnet -YIG) are particularly interesting for studies on the LSSE since the absence of electron charge transport allows the roles of magnons and phonons to be identified in the spin transfer. 1,3,9,10 Temperature, thickness and magnetic field dependence studies have contributed to a phenomenological picture of magnon-driven spin current. [11][12][13][14][15] A temperature gradient across the magnetic insulator thickness leads to the diffusion of thermal magnons that accumulate at the interface with the HM. 16,17 The temperature dependence of the magnon propagation length m results in a characteristic peak in the SSE signal at low temperature when the thickness of the MI is comparable to m . 12 Low frequency magnons play a dominant role due to their large population and

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supporting

confidence: 93%

contrasting

confidence: 58%

Temperature dependence of the picosecond spin Seebeck effect

Kholid

Hamara

Terschanski

et al. 2021

Applied Physics Letters

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“…The observed effect of magnetic field on the amplitude of generated THz pulses in the TbCo 2 /FeCo heterostructure reveals ISHE mechanism of the THz emission similar to that described in Refs. 15 , 32 . Light-induced demagnetization in the FeCo layer launches a pulse of spin current into the TbCo 2 and Ru layers (see Fig.…”

Section: Model and Discussionmentioning

confidence: 99%

Polarization control of THz emission using spin-reorientation transition in spintronic heterostructure

Khusyainov

Ovcharenko

Gaponov

et al. 2021

Sci Rep

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Polarization of electromagnetic waves plays an extremely important role in interaction of radiation with matter. In particular, interaction of polarized waves with ordered matter strongly depends on orientation and symmetry of vibrations of chemical bonds in crystals. In quantum technologies, the polarization of photons is considered as a “degree of freedom”, which is one of the main parameters that ensure efficient quantum computing. However, even for visible light, polarization control is in most cases separated from light emission. In this paper, we report on a new type of polarization control, implemented directly in a spintronic terahertz emitter. The principle of control, realized by a weak magnetic field at room temperature, is based on a spin-reorientation transition (SRT) in an intermetallic heterostructure TbCo2/FeCo with uniaxial in-plane magnetic anisotropy. SRT is implemented under magnetic field of variable strength but of a fixed direction, orthogonal to the easy magnetization axis. Variation of the magnetic field strength in the angular (canted) phase of the SRT causes magnetization rotation without changing its magnitude. The charge current excited by the spin-to-charge conversion is orthogonal to the magnetization. As a result, THz polarization rotates synchronously with magnetization when magnetic field strength changes. Importantly, the radiation intensity does not change in this case. Control of polarization by SRT is applicable regardless of the spintronic mechanism of the THz emission, provided that the polarization direction is determined by the magnetic moment orientation. The results obtained open the prospect for the development of the SRT approach for THz emission control.

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“…[ 56 ] Furthermore, previous study reported that the demagnetization dynamics are temperature independent for Co film. [ 57 ] Therefore, the temperature dependence of

E_{THz}^{peak}

cannot be simply explained in terms of the magnetization varied with temperature.…”

Section: Resultsmentioning

confidence: 99%

“…Our observation is basically consistent with recent reports on the temperature dependence of spin Hall resistivity of Pt layer. [ 57,59 ] We also would like to mention that with decreasing the temperature, the exchange coupling of FM/Mn 2 Au bilayer builds up, which was observed by an asymmetric shape of the hysteresis loops at low temperature. [ 52 ] A small modulation of the exchange‐coupling strength at the interface between FM and AFM might lead to notable changes in magnetic properties.…”

Section: Resultsmentioning

confidence: 99%

Temperature‐Dependent Terahertz Emission from Co/Mn₂Au Spintronic Bilayers

Jin

Song

et al. 2021

Physica Rapid Research Ltrs

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Recently, ferromagnetic/nonmagnetic heavy metal heterostructures have been intensively investigated as terahertz (THz) emitters. The interconversion of spin‐to‐charge dynamics plays a central role for efficient emission of THz electromagnetic pulses. However, a direct observation of spin–charge interconversion in antiferromagnetic (AFM) materials occurring on the sub‐picosecond time scale remains a challenge. Herein, the magnetic‐field‐, pump‐fluence‐, and polarization‐dependent THz emission behaviors by a femtosecond optical pump in cobalt (Co)/Mn2Au nanometer heterostructure are experimentally investigated. The Co/Mn2Au bilayer generates sizable THz signals, whereas the Mn2Au/Pt bilayer does not show any THz emission. In addition, the thickness‐ and temperature‐dependent THz emission measurements indicate a direct relation between the THz amplitude and the conductivity of AFM Mn2Au layer. The results obtained will not only promote the fundamental understanding of ultrafast spin–charge interconversion in Co/Mn2Au heterostructures, but also provide a possibility of spectroscopic‐based spin current detector at THz‐frequency range.

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Temperature dependent inverse spin Hall effect in Co/Pt spintronic emitters

Cited by 19 publications

References 28 publications

Temperature dependence of the picosecond spin Seebeck effect

Temperature dependence of the picosecond spin Seebeck effect

Polarization control of THz emission using spin-reorientation transition in spintronic heterostructure

Temperature‐Dependent Terahertz Emission from Co/Mn₂Au Spintronic Bilayers

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Temperature dependent inverse spin Hall effect in Co/Pt spintronic emitters

Cited by 19 publications

References 28 publications

Temperature dependence of the picosecond spin Seebeck effect

Temperature dependence of the picosecond spin Seebeck effect

Polarization control of THz emission using spin-reorientation transition in spintronic heterostructure

Temperature‐Dependent Terahertz Emission from Co/Mn2Au Spintronic Bilayers

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Product

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Temperature‐Dependent Terahertz Emission from Co/Mn₂Au Spintronic Bilayers