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Search: (WFRF:(Pappas P A)) srt2:(2010-2014) > (2013)

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  • Pappas, S. D., et al. (author)
  • Direct evidence for significant spin-polarization of EuS in Co/EuS multilayers at room temperature
  • 2013
  • In: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 3, s. 1333-
  • Journal article (peer-reviewed)abstract
    • The new era of spintronics promises the development of nanodevices, where the electron spin will be used to store information and charge currents will be replaced by spin currents. For this, ferromagnetic semiconductors at room temperature are needed. We report on significant room-temperature spin polarization of EuS in Co/EuS multilayers recorded by x-ray magnetic circular dichroism (XMCD). The films were found to contain a mixture of divalent and trivalent europium, but only Eu++ is responsible for the ferromagnetic behavior of EuS. The magnetic XMCD signal of Eu at room temperature could unambiguously be assigned to magnetic ordering of EuS and was found to be only one order of magnitude smaller than that at 2.5 K. The room temperature magnetic moment of EuS is as large as the one of bulk ferromagnetic Ni. Our findings pave the path for fabrication of room-temperature spintronic devices using spin polarized EuS layers.
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