Super-Poissonian Shot Noise of Squeezed-Magnon Mediated Spin Transport

The magnetization of a ferromagnet (F) driven out of equilibrium injects pure spin current into an adjacent conductor (N). Such F|N bilayers have become basic building blocks in a wide variety of spin-based devices. We evaluate the shot noise of the spin current traversing the F|N interface when F i...

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Bibliographic Details
Published in:Physical review letters 2016-04, Vol.116 (14), p.146601-146601, Article 146601
Main Authors: Kamra, Akashdeep, Belzig, Wolfgang
Format: Article
Language:English
Subjects:
Compressing
Deltas
Electric current
Ferromagnetic materials
Microwaves
Noise
Shot noise
Spintronics
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Summary:The magnetization of a ferromagnet (F) driven out of equilibrium injects pure spin current into an adjacent conductor (N). Such F|N bilayers have become basic building blocks in a wide variety of spin-based devices. We evaluate the shot noise of the spin current traversing the F|N interface when F is subjected to a coherent microwave drive. We find that the noise spectrum is frequency independent up to the drive frequency, and increases linearly with frequency thereafter. The low frequency noise indicates super-Poissonian spin transfer, which results from quasiparticles with effective spin ℏ^{*}=ℏ(1+δ). For typical ferromagnetic thin films, δ∼1 is related to the dipolar interaction-mediated squeezing of F eigenmodes.
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.116.146601