@article{5bdc7d4ee0b54f559ec3baf869a7f408,
title = "Antiferromagnetic NiO thickness dependent sign of the spin Hall magnetoresistance in γ-Fe2O3/NiO/Pt epitaxial stacks",
abstract = "We study the spin Hall magnetoresistance (SMR) in epitaxial γ-Fe2O3/NiO(001)/Pt stacks, as a function of temperature and thickness of the antiferromagnetic insulating NiO layer. Upon increasing the thickness of NiO from 0 nm to 10 nm, we detect a sign change of the SMR in the temperature range between 10 K and 280 K. This temperature dependence of the SMR in our stacks is different compared to that of previously studied yttrium iron garnet/NiO/Pt, as we do not find any peak or sign change as a function of temperature. We explain our data by a combination of spin current reflection from both the NiO/Pt and γ-Fe2O3/NiO interfaces and the thickness-dependent exchange coupling mode between the NiO and γ-Fe2O3 layers, comprising parallel alignment for thin NiO and perpendicular alignment for thick NiO.",
author = "Dong, {Bo Wen} and Lorenzo Baldrati and Christoph Schneider and Tomohiko Niizeki and Rafael Ramos and Andrew Ross and Joel Cramer and Eiji Saitoh and Mathias Kl{\"a}ui",
note = "Funding Information: This work was supported by Deutsche Forschungsgemeinschaft (DFG) Grant No. SPP 1538 “Spin Caloric Transport,” the Graduate School of Excellence Materials Science in Mainz (MAINZ), and the EU project INSPIN (Project No. FP7-ICT-2013-X 612759). The authors acknowledge the support of the SpinNet (DAAD Spintronics network, Project No. 56268455), the MaHoJeRo (DAAD Spintronics network, Project No. 57334897), and the DFG (Grant No. SFB TRR 173 SPIN+X). This work was supported by the ERATO “Spin Quantum Rectification Project” (Grant No. JPMJER1402) from JST, Japan, Grant-in-Aid for Scientific Research on Innovative Area, “Nano Spin Conversion Science” (Grant No. JP26103005) from JSPS KAKENHI, Japan, and the NEC Corporation. M.K. thanks ICC-IMR at Tohoku University for their hospitality during a visiting researcher stay at the Institute for Materials Research. L.B. acknowledges funding from the European Union{\textquoteright}s Horizon 2020 research and innovation programme under the Marie Sk{\l}odowska-Curie grant agreement ARTES No. 793159. Publisher Copyright: {\textcopyright} 2019 Author(s).",
year = "2019",
month = mar,
day = "11",
doi = "10.1063/1.5080766",
language = "English",
volume = "114",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "10",
}