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Cation distribution and magnetic properties in ultrathin (Ni$$_{1-x}$$Co$$_{x}$$)Fe$$_{2}$$O$$_{4}$$ (x=0-1) layers on Si(111) studied by soft X-ray magnetic circular dichroism

Wakabayashi, Yuki*; Nonaka, Yosuke*; Takeda, Yukiharu; Sakamoto, Shoya*; Ikeda, Keisuke*; Chi, Z.*; Shibata, Goro*; Tanaka, Arata*; Saito, Yuji; Yamagami, Hiroshi; Tanaka, Masaaki*; Fujimori, Atsushi*; Nakane, Ryosho*

We study the electronic structure and magnetic properties of epitaxial (Ni$$_{1-x}$$Co$$_{x}$$)Fe$$_{2}$$O$$_{4}$$(111) layers with thicknesses $$d$$ = 1.7 - 5.2 nm grown on Al$$_{2}$$O$$_{3}$$(111)/Si(111) structures. We revealed the crystallographic (octahedral $$O_{h}$$ or tetrahedral $$T_{d}$$) sites and the valences of the Fe, Co, and Ni cations using experimental soft X-ray absorption spectroscopy and X-ray magnetic circular dichroism spectra and configuration-interaction cluster-model calculation.

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Category:Materials Science, Multidisciplinary

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