Spin noise and damping in individual metallic ferromagnetic nanoparticles

We introduce a highly sensitive and relatively simple technique to observe magnetization motion in single Ni nanoparticles, based on charge sensing by electron tunneling at millidegrees Kelvin temperature. Sequential electron tunneling via the nanoparticle drives nonequilibrium magnetization dynamic...

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Bibliographic Details
Published in:Physical review. B 2017-12, Vol.96 (24), Article 241402
Main Authors: Jiang, W. C., Nunn, G., Gartland, P., Davidović, D.
Format: Article
Language:English
Subjects:
Electron spin
Electron tunneling
Ferromagnetism
Magnetic damping
Magnetization
Nanoparticles
Noise measurement
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Summary:We introduce a highly sensitive and relatively simple technique to observe magnetization motion in single Ni nanoparticles, based on charge sensing by electron tunneling at millidegrees Kelvin temperature. Sequential electron tunneling via the nanoparticle drives nonequilibrium magnetization dynamics, which induces an effective charge noise that we measure in real time. In the free spin diffusion regime, where the electrons and magnetization are in detailed balance, we observe that magnetic damping time exhibits a peak with the magnetic field, with a record long damping time of ≃10 ms.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.241402