Sub-Poissonian shot noise in CoFeB/MgO/CoFeB-based magnetic tunneling junctions

Arakawa, Tomoyuki; Sekiguchi, Koji; Nakamura, Shuji; Chida, Kensaku; Nishihara, Yoko; Chiba, Daichi; Kobayashi, Kensuke; Fukushima, Akio; Yuasa, Shinji; Ono, Teruo

doi:10.1063/1.3590921

Cited by 27 publications

(42 citation statements)

References 22 publications

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“…The recently discovered spin Seebeck effect [10] is attributed to an imbalance of spin-current fluctuations [11,12] caused by a thermal gradient in a ferromagnet|normal metal bilayer system. Spin-dependent coherent transport could be detected in magnetic tunneling junctions (MTJs) via current shot-noise measurements [13,14]. However, a direct measurement of thermal spin-current noise has, to our knowledge, not been reported yet.…”

Section: Introductionmentioning

confidence: 99%

Spin Hall noise

et al. 2014

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We measure the low-frequency thermal fluctuations of pure spin current in a platinum film deposited on yttrium iron garnet via the inverse spin Hall effect (ISHE)-mediated voltage noise as a function of the angle α between the magnetization and the transport direction. The results are consistent with the fluctuation-dissipation theorem in terms of the recently discovered spin Hall magnetoresistance (SMR). We present a microscopic description of the α dependence of the voltage noise in terms of spin-current fluctuations and ISHE.

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Section: Introductionmentioning

confidence: 99%

Spin Hall noise

et al. 2014

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“…(21) and (23), and substituting them into Eq. (18), one arrives at the following relation between the total current fluctuation and its Langevin part:…”

Section: Shot Noise In the Presence Of Spin Relaxationmentioning

confidence: 99%

“…14,15 It has also been shown experimentally that the Fano factor in a single-barrier magnetic tunnel junction depends on magnetic configuration of the junction, and can be remarkably enhanced for the antiparallel alignment of the electrodes' magnetizations. [16][17][18][19][20] Even more possibilities have been found in double-barrier tunnel junctions with two ferromagnetic electrodes and one ferromagnetic central layer, 21,22 where one can distinguish four magnetic configurations corresponding to different alignments of the magnetic moments of all three magnetic layers. 23 It has also been shown that a simple model based on two well-separated spin channels for electronic transport cannot properly describe the experimental observations without taking into account spin-flip transitions.…”

Section: Introductionmentioning

confidence: 99%

Shot noise in magnetic double-barrier tunnel junctions

Szczepański¹,

Dugaev²,

Barnaś³

et al. 2013

Phys. Rev. B

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We calculate shot noise and the corresponding Fano factors in magnetic double-barrier tunnel junctions. Two situations are analyzed: (i) the central metallic layer is nonmagnetic while the external ones are ferromagnetic, and (ii) all of the metallic layers are ferromagnetic. In the latter case, the number of various magnetic configurations of the junctions is larger, which improves the functionality of such devices. The corresponding shot noise and Fano factor are shown to depend on the magnetic configuration of the junctions. The effect of spin relaxation in the central layer is also taken into account. The theoretical results are compared with experimental data on the shot noise in Fe/MgO/Fe/MgO/Fe structures.

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“…49,[53][54][55] The cross-correlation technique is employed as shown in Fig. 3(a) to minimize the external noise from the cables and the amplifiers.…”

Section: High-frequency Measurementsmentioning

confidence: 99%

Observation of finite excess noise in the voltage-biased quantum Hall regime as a precursor for breakdown

et al. 2013

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We performed noise measurements in a two-dimensional electron gas to investigate the nonequilibrium quantum Hall effect (QHE) state. While excess noise is perfectly suppressed around the zero-biased QHE state reflecting the dissipationless electron transport of the QHE state, considerable finite excess noise is observed in the breakdown regime of the QHE. The noise temperature deduced from the excess noise is found to be of the same order as the energy gap between the highest occupied Landau level and the lowest empty one. Moreover, unexpected finite excess noise is observed at a finite source-drain bias voltage smaller than the onset voltage of the QHE breakdown, which indicates finite dissipation in the QHE state and may be related to the prebreakdown of the QHE.

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Sub-Poissonian shot noise in CoFeB/MgO/CoFeB-based magnetic tunneling junctions

Cited by 27 publications

References 22 publications

Spin Hall noise

Spin Hall noise

Shot noise in magnetic double-barrier tunnel junctions

Observation of finite excess noise in the voltage-biased quantum Hall regime as a precursor for breakdown

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