Authors:	Dong, Bo-Wen Baldrati, Lorenzo Schneider, Christoph Niizeki, Tomohiko Ramos, Rafael Ross, Andrew Cramer, Joel Saitoh, Eiji Kläui, Mathias
Title:	Antiferromagnetic NiO thickness dependent sign of the spin Hall magnetoresistance in gamma-Fe2O3/NiO/Pt epitaxial stacks
Online publication date:	20-Aug-2019
Year of first publication:	2019
Language:	english
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.
DDC:	530 Physik 530 Physics
Institution:	Johannes Gutenberg-Universität Mainz
Department:	FB 08 Physik, Mathematik u. Informatik
Place:	Mainz
ROR:	https://ror.org/023b0x485
DOI:	http://doi.org/10.25358/openscience-202
URN:	urn:nbn:de:hebis:77-publ-591981
Version:	Accepted version
Publication type:	Zeitschriftenaufsatz
License:	In Copyright
Information on rights of use:	https://rightsstatements.org/vocab/InC/1.0/
Journal:	Applied physics letters 114 10
Pages or article number:	Art. 102405
Publisher:	American Inst. of Physics
Publisher place:	Melville, NY
Issue date:	2019
ISSN:	1077-3118 0003-6951
Publisher URL:	http://dx.doi.org/10.1063/1.5080766
Publisher DOI:	10.1063/1.5080766
Appears in collections:	JGU-Publikationen