2017
DOI: 10.1103/physrevlett.119.257201
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Spin Transfer due to Quantum Magnetization Fluctuations

Abstract: We utilize a nanoscale magnetic spin-valve structure to demonstrate that current-induced magnetization fluctuations at cryogenic temperatures result predominantly from the quantum fluctuations enhanced by the spin transfer effect. The demonstrated spin transfer due to quantum magnetization fluctuations is distinguished from the previously established current-induced effects by a non-smooth piecewise-linear dependence of the fluctuation intensity on current. It can be driven not only by the directional flows of… Show more

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Cited by 36 publications
(54 citation statements)
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“…2(c) cannot account for the differences in λ N . On the other hand, we note that quantum magnetization fluctuations 39,40 in YIG can also play a role at low T , leading to an enhanced G s .…”
mentioning
confidence: 81%
“…2(c) cannot account for the differences in λ N . On the other hand, we note that quantum magnetization fluctuations 39,40 in YIG can also play a role at low T , leading to an enhanced G s .…”
mentioning
confidence: 81%
“…However, as discussed above, such fluctuations are forbidden in the ground state of ferromagnets [20], and if generated as random magnetic field [38] by the nonequilibrium spin shot noise [36], they would lead to rotation of magnetization away from the initial collinear direction that was excluded from the experiments of Ref. [16]. We propose to clarify the role of spin shot noise by using a sequence of Lorentzian voltage pulses to inject a train of levitons into a collinear spin valve, where leviton as a minimal collective many-body excitation above the Fermi sea carrying a single electron charge, is free of particle-hole pairs and has vanishing current noise [39,40].…”
Section: Well the System Hamiltonian Acting In H Iŝmentioning
confidence: 99%
“…However, this well-established picture cannot explain very recent experiments [16] on collinear spin valves at cryogenic temperatures 3 K, where resistance measurements have revealed magnetization dynamics even though thermal fluctuations that could introduce noncollinearity between the free and fixed magnetizations are suppressed. This implies a mechanism where standard STT is zero, T ≡ 0 in Eq.…”
mentioning
confidence: 91%
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“…Therefore, measuring the magnetoresistance reflects the total magnetization fluctuations. Reference [11] finds an asymmetric enhancement of the magnetic fluctuations as a function of current, which is in contradiction to semiclassical STT theory.…”
mentioning
confidence: 85%