Electrical detection of nuclear spin-echo signals in an electron spin injection system

Lin, Zhichao; Rasly, M.; Uemura, Tetsuya

doi:10.1063/1.4985650

Cited by 3 publications

(3 citation statements)

References 33 publications

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“…The techniques above employ angular-momentum transfer from the electron to the nuclear spin via the contact hyperfine interaction, and they have shown remarkable success in semiconductors with an s-wave conduction band, such as GaAs [10]. While both optical and electrical pumping and detection methods can achieve high levels of nuclear spin polarization and sensitivity [11][12][13][14][15], the electrical one offers greater spatial selectivity and holds promise for integration with spintronic devices [16,17]. Studies have demonstrated that nuclear spins in highly-doped GaAs semiconductors can be dynamically polarized by injecting spin-polarized electrons from an adjacent ferromagnetic contact [18][19][20], and coherent manipulation of these polarized nuclear spins has also been achieved [21].…”

Section: Introductionmentioning

confidence: 99%

Spin–orbit torque on nuclear spins exerted by a spin accumulation via hyperfine interactions

Cahaya,

Leon,

Fauzi

2023

Nanotechnology

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Spin-transfer and spin-orbit torques allow controlling magnetic degrees of freedom in various materials and devices. However, while the transfer of angular momenta between electrons has been widely studied, the contribution of nuclear spins has yet to be explored further. This article demonstrates that the hyperfine coupling, which consists of Fermi contact and dipolar interactions, can mediate the application of spin-orbit torques acting on nuclear spins. Our starting point is a sizable nuclear spin in a metal with electronic spin accumulation. Then, via the hyperfine interactions, the nuclear spin modifies the an electronic spin density. The reactions to the equilibrium and nonequilibrium components of the spin density is a torque on the nucleus with field-like and damping-like components, respectively. This nuclear spin-orbit torque is a step toward stabilizing and controlling nuclear magnetic momenta, in magnitude and direction, and realizing nuclear spintronics.

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Section: Introductionmentioning

confidence: 99%

Spin–orbit torque on nuclear spins exerted by a spin accumulation via hyperfine interactions

Cahaya,

Leon,

Fauzi

2023

Nanotechnology

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“…This interaction dramatically increases the signal intensity available for detection of the nuclear-spin states compared with pick-up-coil detection. Several methods to create and detect nuclear spins through the hyperfine interaction have been demonstrated by using optically- [1][2][3][4][5][6][7][8][9][10][11][12][13] or electrically [14][15][16][17][18][19][20][21][22][23][24][25]-created electron spins.…”

Section: Introductionmentioning

confidence: 99%

“…Electrical spin injection using ferromagnetic electrodes as a source of electron spins is the most recent proposal for an electrical DNP [16,[18][19][20][21][22][23][24][25]. In such a system, a highly efficient spin source is essential for an effective DNP.…”

Section: Introductionmentioning

confidence: 99%

Systematic investigations of transient response of nuclear spins in the presence of polarized electrons

2017

Self Cite

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We electrically probed the transient response of nuclear spins in an n-GaAs channel by performing Hanle signal and spin-valve signal measurements on an all-electrical spin-injection device having a half-metallic spin source of Co 2 MnSi. Furthermore, we simulated the Hanle and spin-valve signals by using the time evolution of nuclear-spin polarization under the presence of polarized electron spins by taking both T 1e and T 1 into consideration, where T −1 1e is the polarization rate of nuclear spins through the transfer of angular momentum from polarized electron spins and T −1 1 is the depolarization rate of nuclear spins through the interaction with the lattice. The simulation results reproduced our experimental results on all the nuclear-spin-related phenomena appearing in the Hanle and spin-valve signals at different measurement conditions, providing quantitative explanation for the transient response of nuclear spins in GaAs to a change in magnetic fields and an estimate of the time scales of T 1e and T 1 . These experimental and simulated results will deepen the understanding of nuclear-spin dynamics in semiconductors.

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Electrical spin injection into AlGaAs/GaAs-based two-dimensional electron gas systems with Co2MnSi spin source up to room temperature

Lin

Pan

Rasly

et al. 2019

Applied Physics Letters

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We demonstrated electrical spin injection into an AlGaAs/GaAs-based high-mobility two-dimensional electron gas (2DEG) system using Co2MnSi as a spin source. A non-local spin-valve signal was observed from 4.2 K to room temperature. Interestingly, the spin-valve signal does not show a monotonic decrease with increasing temperature and reaches a peak at about 80 K. This contrasts with the result observed in bulk GaAs, in which a monotonic decrease in spin-valve signals with increasing temperature was observed. Moreover, the spin-valve signal decreases by a factor of about 5.6 with increasing temperature from 4.2 K to 294 K, and this factor is smaller than those values reported in bulk GaAs devices. This result suggests that the spin-valve signal in a 2DEG device is less sensitive to temperature than that in a bulk device, which is promising for realizing future spin transistors that can operate at room temperature.

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Electrical detection of nuclear spin-echo signals in an electron spin injection system

Cited by 3 publications

References 33 publications

Spin–orbit torque on nuclear spins exerted by a spin accumulation via hyperfine interactions

Spin–orbit torque on nuclear spins exerted by a spin accumulation via hyperfine interactions

Systematic investigations of transient response of nuclear spins in the presence of polarized electrons

Electrical spin injection into AlGaAs/GaAs-based two-dimensional electron gas systems with Co2MnSi spin source up to room temperature

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