Magnetic Anisotropy Variations and Non-Equilibrium Tunneling in a Cobalt Nanoparticle
M. M. Deshmukh, S. Gueron, E. Bonet, A. N. Pasupathy, S. Kleff, J. von Delft, D. C. Ralph
Abstract
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.
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