Orbital moment anisotropy in ultrathin FePt layers | Zendy

Márcio M. Soares | Zendy; Anne Lamirand | Zendy; Aline Y. Ramos | Zendy; M. De Santis | Zendy; H. Tolentino | Zendy

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Orbital moment anisotropy in ultrathin FePt layers

Author(s) -

Márcio M. Soares,

Anne Lamirand,

Aline Y. Ramos,

M. De Santis,

H. Tolentino

Publication year - 2014

Publication title -

physical review b

Language(s) - English

Resource type - Journals

eISSN - 1538-4489

pISSN - 1098-0121

DOI - 10.1103/physrevb.90.214403

Subject(s) - magnetocrystalline anisotropy , condensed matter physics , anisotropy , magnetic circular dichroism , magnetic moment , magnetic anisotropy , materials science , x ray magnetic circular dichroism , moment (physics) , ferromagnetism , magnetization , physics , optics , magnetic field , quantum mechanics , spectral line

International audienceThe anisotropy of the Fe orbital moment is investigated in epitaxial ultrathin (<2 nm) FePt layers by angular dependent x-ray magnetic circular dichroism (XMCD) for two distinct epitaxial systems, CoO/FePt/Pt(001) and Pt/FePt/MnPt/Pt(001). Element selective hysteresis loops obtained from the XMCD signal at the Fe L 3 edge are used to quantify the anisotropy constants, which are consistent with the corresponding chemical order parameter. A careful procedure for XMCD sum rules data analysis is set up to avoid experimental overestimation of the orbital moment. The measured orbital moment of Fe is found comparable to theoretical values and shows a significant anisotropy. This orbital moment anisotropy is discussed in the light of the current theoretical understanding of magnetocrystalline anisotropy in ordered alloys

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