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X-ray magnetic circular dichroism and photoemission studies of ferromagnetism in CaMn$$_{1-x}$$Ru$$_{x}$$O$$_{3}$$ thin films

Terai, Kota*; Yoshii, Kenji ; Takeda, Yukiharu  ; Fujimori, Shinichi  ; Saito, Yuji ; Owada, Kenji; Inami, Toshiya; Okane, Tetsuo ; Arita, Masashi*; Shimada, Kenya*; Namatame, Hirofumi*; Taniguchi, Masaki*; Kobayashi, Keisuke*; Kobayashi, Masaki*; Fujimori, Atsushi*

We have studied the electronic and magnetic properties of epitaxially grown CaMn$$_{1-x}$$Ru$$_{x}$$O$$_{3}$$ thin films ($$x$$ = 1.0, 0.75, 0.5) by soft X-ray absorption (XAS), soft X-ray magnetic circular dichroism (XMCD) and hard X-ray photoemission spectroscopy (HXPES) measurements. The XMCD studies indicated that the spin moments of Mn and Ru are aligned in opposite directions. The valence-band HXPES spectra revealed that the Ru 4${it d}$ $$t_{2g}$$ states around the Fermi level and the Mn 3${it d}$ $$t_{2g}$$ up-spin states centered $$sim$$ 2 eV below it, both of which showed systematic concentration dependences. From these results, we propose that the localized Mn 3${it d}$ $$t_{2g}$$ states and the itinerant Ru 4${it d}$ $$t_{2g}$$ band are antiferromagnetically coupled and give rise to the ferromagnetic ordering, in analogy to the mechanism proposed for double perovskite oxides such as Sr$$_{2}$$FeMoO$$_{6}$$.

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Category:Materials Science, Multidisciplinary

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