Abstract
The magnetization reversal of a ferromagnetic Fe3O4 nanoparticle with a volume of the order of several thousands of cubic nanometers under the influence of spin-polarized current has been investigated on a high-vacuum scanning tunneling microscope, where one of the electrodes is a magnetized iron wire needle and the second electrode is a ferromagnetic nanoparticle on a graphite substrate. The measured threshold current of magnetization reversal, i.e., the lowest value of the current corresponding to the magnetization reversal, is found to be I thresh ≈ 9 nA. A change in the magnetization of a nanoparticle is revealed using the giant magnetoresistance effect, i.e., the dependence of the weak polarized current (I < I thresh) on the relative orientation of the magnetizations of the electrodes.
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Original Russian Text © M.A. Kozhushner, A.K. Gatin, M.V. Grishin, B.R. Shub, V.P. Kim, G.B. Khomutov, L.I. Trakhtenberg, 2016, published in Fizika Tverdogo Tela, 2016, Vol. 58, No. 2, pp. 259–265.
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Kozhushner, M.A., Gatin, A.K., Grishin, M.V. et al. Change in the magnetic moment of a ferromagnetic nanoparticle under polarized current. Phys. Solid State 58, 266–272 (2016). https://doi.org/10.1134/S1063783416020177
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DOI: https://doi.org/10.1134/S1063783416020177