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Abdulahad, Faris Basheer; Lin, Jin-Han; Liou, Y.; Chiu, Wen-Kai; Chang, Liang-Cheng; Kao, Ming-Yi; Liang, Jie; Hung, D. S.; Lee, S. F.

doi:10.1103/physrevb.92.241304

Cited by 13 publications

(14 citation statements)

References 45 publications

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“…The observation is distinct from the magnetization pinning of exchange bias, in which the H eff direction is fixed depending on the interfacial magnetic structure. The fact that H eff existed only in FMR measurement suggests that it comes from spin-pumping-induced spin imbalance at the interface as previously reported 44 . Through exchange coupling to the magnetic layer, the non-equilibrium spin density 〈 S 〉 neq of the TSS gives rise to field-like torque: where Δ ex is the exchange coupling constant 45 .…”

Section: Resultssupporting

confidence: 70%

Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi2Se3/yttrium iron garnet heterostructures

Fanchiang¹,

Chen²,

Tseng³

et al. 2018

Nat Commun

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Harnessing the spin–momentum locking of topological surface states in conjunction with magnetic materials is the first step to realize novel topological insulator-based devices. Here, we report strong interfacial coupling in Bi2Se3/yttrium iron garnet (YIG) bilayers manifested as large interfacial in-plane magnetic anisotropy (IMA) and enhancement of damping probed by ferromagnetic resonance. The interfacial IMA and damping enhancement reaches a maximum when the Bi2Se3 film approaches its two-dimensional limit, indicating that topological surface states play an important role in the magnetization dynamics of YIG. Temperature-dependent ferromagnetic resonance of Bi2Se3/YIG reveals signatures of the magnetic proximity effect of TC as high as 180 K, an emerging low-temperature perpendicular magnetic anisotropy competing the high-temperature IMA, and an increasing exchange effective field of YIG steadily increasing toward low temperature. Our study sheds light on the effects of topological insulators on magnetization dynamics, essential for the development of topological insulator-based spintronic devices.

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Section: Resultssupporting

confidence: 70%

Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi2Se3/yttrium iron garnet heterostructures

Fanchiang¹,

Chen²,

Tseng³

et al. 2018

Nat Commun

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“…40 shows how the latter value is higher than most of those found in literature for similar systems. More specifically, F. B. Abdulahad et al 49 used FMR to probe a NiFe/Bi 2 Te 3 heterostructure, reporting a g ↑↓ eff in the 1–4 × 10 19 m −2 range, being one order of magnitude lower than the g ↑↓ eff value we measure in FGT/Bi 2 Te 3 .…”

Section: Resultscontrasting

confidence: 55%

“…40 shows how the latter value is higher than most of those found in literature for similar systems. More specifically, F. B. Abdulahad et al 49 to probe a NiFe/Bi 2 Te 3 heterostructure, reporting a g eff in the 1-4 × 10 19 −2 range, being one order of magnitude lower than the "# eff value we measure in FGT/Bi 2 Te 3 . Our results demonstrate the great potential of the developed FGT/Bi 2 Te 3 system towards its use as an efficient spincharge converter based on the 2D ferromagnet Fe 5−δ GeTe 2 and the 3D topological insulator Bi 2 Te 3 .…”

Section: Spin Accumulation At the Fgt/bi 2 Te 3 Interfacecontrasting

confidence: 59%

“…Sb 2 Te 3 , B 2 Se 3 , Bi 2 Te 3 ). 40,48,49 Our results show that Bi 2 Te 3 acts as a good spin sinking material when in contact with FGT, with the spin current that is generated at resonance within the FGT layer being markedly absorbed by the neighboring Bi 2 Te 3 . This process can be quantified by calculating the so called spin mixing conductance G "# eff , an intrinsic property of a system whose real part is proportional to the amount of the spin current crossing the FGT/Bi 2 Te 3 interface and absorbed by the spin sink layer, as regulated by eqn (2).…”

Section: Spin Accumulation At the Fgt/bi 2 Te 3 Interfacementioning

confidence: 72%

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Significant enhancement of ferromagnetism above room temperature in epitaxial 2D van der Waals ferromagnet Fe_5−δGeTe₂/Bi₂Te₃ heterostructures

et al. 2023

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“…Another interesting effect is the spin current to charge current conversion on the surface of the TI, which is known as the inverse Edelstein effect (IEE) 7 . The IEE effect in the TI was supported by spin-pumping experiments on various representative TI-FM heterostructures [8][9][10][11][12] . In the spin-pumping experiment, as shown in Fig.…”

mentioning

confidence: 98%

Modeling all-electrical detection of the inverse Edelstein effect by spin-polarized tunneling in a topological-insulator/ferromagnetic-metal heterostructure

Dey

Banerjee

2018

Phys. Rev. B

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The spin-momentum locking of the surface states in a three dimensional topological insulator (TI) allows a charge current on the surface of the TI induced by an applied spin current onto the surface, which is known as the inverse Edelstein effect (IEE), that could be achieved either by injecting pure spin current by spin-pumping from a ferromagnetic metal (FM) layer or by injecting spin-polarized charge current by direct tunneling of electrons from the FM to the TI. Here, we present a theory of the observed IEE effect in a TI-FM heterostructure for the spin-polarized tunneling experiments. If an electrical current is passed from the FM to the surface of the TI, because of density of states polarization of the FM, an effective imbalance of spin-polarized electrons occurs on the surface of the TI. Due to the spin-momentum helical locking of the surface states in the TI, a difference of transverse charge accumulation appears on the TI surface in a direction orthogonal to the direction of the magnetization of the FM, which is measured as a voltage difference. Here, we derive the two-dimensional transport equations of electrons on the surface of a diffusive TI, coupled to a FM, starting from quantum kinetic equation, and analytically solve the equations for a rectangular geometry to calculate the voltage difference.

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Spin chemical potential bias induced surface current evidenced by spin pumping into the topological insulatorBi2Te3

Cited by 13 publications

References 45 publications

Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi2Se3/yttrium iron garnet heterostructures

Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi2Se3/yttrium iron garnet heterostructures

Significant enhancement of ferromagnetism above room temperature in epitaxial 2D van der Waals ferromagnet Fe_5−δGeTe₂/Bi₂Te₃ heterostructures

Modeling all-electrical detection of the inverse Edelstein effect by spin-polarized tunneling in a topological-insulator/ferromagnetic-metal heterostructure

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Spin chemical potential bias induced surface current evidenced by spin pumping into the topological insulatorBi2Te3

Cited by 13 publications

References 45 publications

Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi2Se3/yttrium iron garnet heterostructures

Strongly exchange-coupled and surface-state-modulated magnetization dynamics in Bi2Se3/yttrium iron garnet heterostructures

Significant enhancement of ferromagnetism above room temperature in epitaxial 2D van der Waals ferromagnet Fe5−δGeTe2/Bi2Te3 heterostructures

Modeling all-electrical detection of the inverse Edelstein effect by spin-polarized tunneling in a topological-insulator/ferromagnetic-metal heterostructure

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Product

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Significant enhancement of ferromagnetism above room temperature in epitaxial 2D van der Waals ferromagnet Fe_5−δGeTe₂/Bi₂Te₃ heterostructures