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論文

Thickness-dependent magnetic properties and strain-induced orbital magnetic moment in SrRuO$$_{3}$$ thin films

石上 啓介*; 吉松 公平*; 豊田 大介*; 滝沢 優*; 吉田 鉄平*; 芝田 悟朗*; 原野 貴幸*; 高橋 文雄*; 門野 利治*; Verma, V. K.*; et al.

Physical Review B, 92(6), p.064402_1 - 064402_5, 2015/08

 被引用回数:29 パーセンタイル:80.07(Materials Science, Multidisciplinary)

Thin films of the ferromagnetic metal SrRuO$$_{2}$$ (SRO) show a varying easy magnetization axis depending on the epitaxial strain, and undergo a metal-to-insulator transition with decreasing film thickness. We have investigated the magnetic properties of SRO thin films with varying thicknesses fabricated on SrTiO$$_{3}$$(001) substrates by soft X-ray magnetic circular dichroism at the Ru M2,3 edge. Results have shown that, with decreasing film thickness, the film changes from ferromagnetic to nonmagnetic at around 3 monolayer thickness, consistent with previous magnetization and magneto-optical Kerr effect measurements. The orbital magnetic moment perpendicular to the film was found to be 0.1$$mu$$B/Ru, and remained nearly unchanged with decreasing film thickness while the spin magnetic moment decreases. A mechanism for the formation of the orbital magnetic moment is discussed based on the electronic structure of the compressively strained SRO film.

論文

Orbital magnetic moment and coercivity of SiO$$_2$$-coated FePt nanoparticles studied by X-ray magnetic circular dichroism

高橋 文雄*; 門野 利治*; 山本 真平*; Singh, V. R.*; Verma, V.*; 石上 啓介*; 芝田 悟朗*; 原野 貴幸*; 竹田 幸治; 岡根 哲夫; et al.

Physical Review B, 90(2), p.024423_1 - 024423_5, 2014/07

AA2015-0417.pdf:0.45MB

 被引用回数:5 パーセンタイル:27.7(Materials Science, Multidisciplinary)

We have investigated the spin and orbital magnetic moments of Fe in FePt nanoparticles in the $$L1_{0}$$-ordered phase coated with SiO$$_2$$ by X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) measurements at the Fe $$L_{2,3}$$ absorption edges. The magnetic coercivity (H$$_{c}$$) was found to be as large as 1.8 T at room temperature, 3 times larger than the thin film value and 50 times larger than that of the gas phase condensed nanoparticles. The hysteresis curve is well explained by the Stoner-Wohlfarth model for noninteracting single-domain nanoparticles with the H$$_{c}$$ distributed from 1 to 5 T.

論文

Thickness-dependent ferromagnetic metal to paramagnetic insulator transition in La$$_{0.6}$$Sr$$_{0.4}$$MnO$$_3$$ thin films studied by X-ray magnetic circular dichroism

芝田 悟朗*; 吉松 公平*; 坂井 延寿*; Singh, V. R.*; Verma, V.*; 石上 啓介*; 原野 貴幸*; 門野 利治*; 竹田 幸治; 岡根 哲夫; et al.

Physical Review B, 89(23), p.235123_1 - 235123_5, 2014/06

AA2015-0419.pdf:0.33MB

 被引用回数:12 パーセンタイル:53.39(Materials Science, Multidisciplinary)

Metallic transition-metal oxides undergo a metal-to-insulator transition (MIT) as the film thickness decreases across a critical thickness of several monolayers (MLs), but its driving mechanism remains controversial. We have studied the thickness-dependent MIT of the ferromagnetic metal La$$_{0.6}$$Sr$$_{0.4}$$MnO$$_3$$ by X-ray absorption spectroscopy and X-ray magnetic circular dichroism. The results suggest that the ferromagnetic phase gradually and most likely inhomogeneously turns into the paramagnetic phase and both phases abruptly become insulating at the critical thickness.

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