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

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Physical Review Letters. 2016, 116(14), 146601. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.116.146601
Zusammenfassung

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.

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ISO 690KAMRA, Akashdeep, Wolfgang BELZIG, 2016. Super-Poissonian Shot Noise of Squeezed-Magnon Mediated Spin Transport. In: Physical Review Letters. 2016, 116(14), 146601. ISSN 0031-9007. eISSN 1079-7114. Available under: doi: 10.1103/PhysRevLett.116.146601
BibTex
@article{Kamra2016-04-08Super-33559,
  year={2016},
  doi={10.1103/PhysRevLett.116.146601},
  title={Super-Poissonian Shot Noise of Squeezed-Magnon Mediated Spin Transport},
  number={14},
  volume={116},
  issn={0031-9007},
  journal={Physical Review Letters},
  author={Kamra, Akashdeep and Belzig, Wolfgang},
  note={Article Number: 146601}
}
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