Thickness-dependent magnetic properties and strain-induced orbital magnetic moment in SrRuO3 thin films

被引：47

作者：

Ishigami, K. ^{[1
]}

Yoshimatsu, K. ^{[2
]}

Toyota, D. ^{[2
]}

Takizawa, M. ^{[1
]}

Yoshida, T. ^{[1
]}

Shibata, G. ^{[1
]}

Harano, T. ^{[1
]}

Takahashi, Y. ^{[1
]}

Kadono, T. ^{[1
]}

Verma, V. K. ^{[1
]}

Singh, V. R. ^{[1
]}

Takeda, Y. ^{[3
]}

Okane, T. ^{[3
]}

Saitoh, Y. ^{[3
]}

Yamagami, H. ^{[3
]}

Koide, T. ^{[4
]}

Oshima, M. ^{[2
]}

Kumigashira, H. ^{[2
,4
]}

Fujimori, A. ^{[1
,3
,5
]}

机构：

[1] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[2] Univ Tokyo, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan

[3] Japan Atom Energy Agcy, Quantum Beam Sci Directorate, Sayo, Hyogo 6795148, Japan

[4] High Energy Accelerator Res Org, IMSS, Photon Factory, Tsukuba, Ibaraki 3050801, Japan

[5] Univ Tokyo, Dept Complex Sci & Engn, Kashiwa, Chiba 2770882, Japan

来源：

PHYSICAL REVIEW B | 2015年 / 92卷 / 06期

关键词：

RAY CIRCULAR-DICHROISM; ELECTRONIC-STRUCTURE; ANISOTROPY;

D O I：

10.1103/PhysRevB.92.064402

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Thin films of the ferromagnetic metal SrRuO3 (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 SrTiO3(001) substrates by soft x-ray magnetic circular dichroism at the Ru M-2,M-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 similar to 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.

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页数：5

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