Spin Polarization and Magneto-Coulomb Oscillations in Ferromagnetic Single Electron Devices

Details Spin Polarization and Magneto-Coulomb Oscillations in Ferromagnetic Single Electron Devices Spin Polarization and Magneto-Coulomb Oscillations in Ferromagnetic Single Electron Devices

1998-03-06

arxiv.org/abs/cond-mat/9803070v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, uses jpsj.sty, submitted to J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.67.2852

The magneto-Coulomb oscillation, the single electron repopulation induced by external magnetic field, observed in a ferromagnetic single electron transistor is further examined in various ferromagnetic single electron devices. In case of double- and triple-junction devices made of Ni and Co electrodes, the single electron repopulation always occurs from Ni to Co electrodes with increasing a magnetic field, irrespective of the configurations of the electrodes. The period of the magneto-Coulomb oscillation is proportional to the single electron charging energy. All these features are consistently explained by the mechanism that the Zeeman effect induces changes of the Fermi energy of the ferromagnetic metal having a non-zero spin polarizations. Experimentally determined spin polarizations are negative for both Ni and Co and the magnitude is larger for Ni than Co as expected from band calculations.

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