Titanium magnetic polarization at the Fe/BaTiO₃ interfaces: An effect of ferroelectric polarization discontinuity

TY - JOUR

T1 - Titanium magnetic polarization at the Fe/BaTiO3 interfaces

T2 - An effect of ferroelectric polarization discontinuity

AU - Paul, Amitesh

AU - Zheng, Jian Guo

AU - Aoki, Toshihiro

N1 - Publisher Copyright: © 2017 Author(s).

PY - 2017/10/21

Y1 - 2017/10/21

N2 - The exotic magnetic phenomena and the associated functionalities have attracted extensive scientific interest in fundamental physics and cater to the purpose of the novel material search. In this article, with a combination of the electron energy-loss spectroscopy and the X-ray absorption spectroscopy, we have investigated the interfacial Fe atoms and the induced ferromagnetic moment of Ti atoms in Fe/BaTiO3 (BTO) heterostructures. The samples were grown with two different BTO thicknesses, thus resulting in two different states of distorted oxygen environments or different electrostatic potentials. We demonstrate that in these systems, the electronic and magnetic proximity effects remain coupled as the ferroelectric polar discontinuity is held responsible for an induced transfer of the interface electrons. These electrons migrate from the Fe2+ layers to the Ti(4+)-δ layers with the hybridization via O-2p oxide orbitals into Ti orbitals to screen the ferroelectric polarization. These findings, in charge neutral BaO-TiO2 and FeO layers or nonpolar/nopolar interface, essentially underline the central role of the covalent bonding in defining the spin-electronic properties.

AB - The exotic magnetic phenomena and the associated functionalities have attracted extensive scientific interest in fundamental physics and cater to the purpose of the novel material search. In this article, with a combination of the electron energy-loss spectroscopy and the X-ray absorption spectroscopy, we have investigated the interfacial Fe atoms and the induced ferromagnetic moment of Ti atoms in Fe/BaTiO3 (BTO) heterostructures. The samples were grown with two different BTO thicknesses, thus resulting in two different states of distorted oxygen environments or different electrostatic potentials. We demonstrate that in these systems, the electronic and magnetic proximity effects remain coupled as the ferroelectric polar discontinuity is held responsible for an induced transfer of the interface electrons. These electrons migrate from the Fe2+ layers to the Ti(4+)-δ layers with the hybridization via O-2p oxide orbitals into Ti orbitals to screen the ferroelectric polarization. These findings, in charge neutral BaO-TiO2 and FeO layers or nonpolar/nopolar interface, essentially underline the central role of the covalent bonding in defining the spin-electronic properties.

UR - http://www.scopus.com/inward/record.url?scp=85031800581&partnerID=8YFLogxK

U2 - 10.1063/1.4998531

DO - 10.1063/1.4998531

M3 - 文章

AN - SCOPUS:85031800581

SN - 0021-8979

VL - 122

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 15

M1 - 154302

ER -