Magnetic Anisotropy Variations and Non-Equilibrium Tunneling in a Cobalt Nanoparticle

We present detailed measurements of the discrete electron-tunneling level spectrum within nanometer-scale cobalt particles as a function of magnetic field and gate voltage, in this way probing individual quantum many-body eigenstates inside ferromagnetic samples. Variations among the observed levels...

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Bibliographic Details
Published in:arXiv.org 2001-08
Main Authors: Deshmukh, M M, Gueron, S, Bonet, E, Pasupathy, A N, Kleff, S, J von Delft, Ralph, D C
Format: Article
Language:English
Subjects:
Cobalt
Eigenvectors
Electric potential
Ferromagnetism
Magnetic anisotropy
Nanoparticles
Online Access:Get full text
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Summary:We present detailed measurements of the discrete electron-tunneling level spectrum within nanometer-scale cobalt particles as a function of magnetic field and gate voltage, in this way probing individual quantum many-body eigenstates inside ferromagnetic samples. Variations among the observed levels indicate that different quantum states within one particle are subject to different magnetic anisotropy energies. Gate-voltage studies demonstrate that the low-energy tunneling spectrum is affected dramatically by the presence of non-equilibrium spin excitations.
ISSN:2331-8422
DOI:10.48550/arxiv.0108166