[15p-501-1~19] CS.6 10.1,10.2,10.3,10.4 Code-sharing session "Emerging control-methods of magnetization and related phenomena"

[15p-501-4] Magnetic moments of ultrathin Fe under an external electric field studied by high-precision X-ray magnetic circular dichroism spectroscopy

〇Takuya Tsukahara¹, Takeshi Kawabe¹, Koki Shimose¹, Taishi Furuta¹, Risa Miyakaze¹, Kohei Nawaoka¹, Minori Goto^1,4, Takayuki Nozaki², Shinji Yuasa², Yoshinori Kotani³, Kentaro Toyoki³, Motohiro Suzuki³, Tetsuya Nakamura³, Yoshishige Suzuki^1,4, Shinji Miwa^1,4 (1.Osaka Univ., 2.AIST, 3.JASRI, 4.CSRN)

Keywords:X-ray magnetic circular dichroism, Magnetic anisotropy

Magnetic anisotropy in ferromagnetic metals can be controlled by external voltage. In the devices using GdO with large ionic conductivity, the anisotropy change can be caused by chemical reaction following significant change in 3d valence state. However, such a thermally activation process cannot explain the magnetic anisotropy change in fast periods (< 1 ns) reported in Fe/MgO magnetic tunnel junctions. We reported that no trace of chemical reaction was detected in the x-ray absorption spectra (XAS, <8%) when an electric field of 0.5 V/nm was applied to Fe/MgO interface. Recently, we have developed our design of XAS and its x-ray magnetic circular dichroism (XMCD) experiment and its precision error was developed 40 times. In this study, we again report XAS and its XMCD of 0.5nm-Fe under external voltage.