Modulation of Dirac electrons in epitaxial BiSe ultrathin films on van der Waals ferromagnet CrSiTe

Kato, Takemi*; Sugawara, Katsuaki*; Ito, Naohiro*; Yamauchi, Kunihiko*; Sato, Takumi*; Oguchi, Tamio*; Takahashi, Takashi*; Shiomi, Yuki*; Saito, Eiji; Sato, Takafumi*

Physical Review Materials (Internet), 4(8), p.084202_1 - 084202_6, 2020/08

https://doi.org/10.1103/PhysRevMaterials.4.084202

NEXAFS spectra of an epitaxial boron nitride film on Ni(111)

Shimoyama, Iwao; Baba, Yuji; Sekiguchi, Tetsuhiro; Nath, K. G.

Journal of Electron Spectroscopy and Related Phenomena, 137-140, p.573 - 578, 2004/07

https://doi.org/10.1016/j.elspec.2004.02.040

Hexagonal boron nitride (h-BN) thin film has been epitaxially formed on Ni(111) by chemical vapor deposition using borazine gas. The electronic structure of this system is studied by near edge X-ray absorption fine structure (NEXAFS) spectroscopy and X-ray photoelectron spectroscopy (XPS). The thickness of the h-BN is estimated to be about two-layers from XPS. B K-edge NEXAFS spectra show new * peak which is not observed in the spectrum for bulk h-BN. From a polarization dependence analysis of NEXAFS, we propose this new * peak originates from the interaction between the h-BN and Ni(111). This new * peak clearly proves that conduction band of h-BN/Ni(111) is different from that of bulk h-BN.

Theory of perpendicular magnetic anisotropy induced by Rashba spin-orbit interaction in ferromagnetic ultrathin films

Ieda, Junichi; Barnes, S. E.*; Maekawa, Sadamichi

no journal, , 

We develop a simple analytic theory for the existence and electrical control of perpendicular magnetic anisotropy (PMA) based on the Rashba spin-orbit interaction and the single band Stoner model of magnetism. We show the competition between the Rashba spin-orbit fields and the exchange interaction, reflecting electron correlations. This theory can potentially lead to a very large magnetic anisotropy arising from the internal electric fields, , which exist at, e.g., ferromagnetic/metal and ferromagnetic/oxide insulator interfaces but modified by the addition of an applied electric field . There is a Rashba splitting of the band structure leading to a quadratic, , contribution to the magnetic anisotropy, contrasting with a linear in doping effect.