2017
DOI: 10.1103/physics.10.135
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Quantum Spin Torque

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 nonsmooth 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 3 publications
(3 citation statements)
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“…Importantly, this STT incorporates spontaneous magnon emission, which gives rise to a dependence of the resistance on the absolute value |I| of the current, thereby manifesting as the zero-bias kink: remarkably, spin fluctuations are enhanced for both directions of current, which stands in contrast to classical predictions. 19 We now turn to the task of writing a minimal model that captures both effects. To incorporate inelastic spinflip scattering of electrons naturally, we focus on a magnetic tunnel junction (MTJ) (oriented in a parallel or antiparallel configuration).…”
Section: Modelmentioning
confidence: 99%
See 1 more Smart Citation
“…Importantly, this STT incorporates spontaneous magnon emission, which gives rise to a dependence of the resistance on the absolute value |I| of the current, thereby manifesting as the zero-bias kink: remarkably, spin fluctuations are enhanced for both directions of current, which stands in contrast to classical predictions. 19 We now turn to the task of writing a minimal model that captures both effects. To incorporate inelastic spinflip scattering of electrons naturally, we focus on a magnetic tunnel junction (MTJ) (oriented in a parallel or antiparallel configuration).…”
Section: Modelmentioning
confidence: 99%
“…18 As both MAT and STT may manifest as zero-bias kinks in the electrical response, a careful theoretical treatment is necessary to distinguish these, as well as to elucidate the nature (classical versus quantum) of the STT in nanoscale junctions. 19 Previous theoretical studies, such as quantum master equation approaches 20 , treat quantum spin fluctuations, but focus on spin dynamics rather than charge transport features. Others, including a quantum Green's function approach 21 , formally integrate spin fluctuations and focus on the ensuing magnetotransport.…”
Section: Introductionmentioning
confidence: 99%
“…The quantum origins of spin torque, as opposed to the "classical"spin transfer torque have been speculated recently in Refs. [13,14]. In this paper, we give an example where the mechanism underlying the equilibrium spin torque is quantum in nature and due to spin flip scattering.…”
Section: Introductionmentioning
confidence: 99%