Negative spin Hall magnetoresistance of Pt on the bulk easy-plane antiferromagnet NiO

We report on spin Hall magnetoresistance (SMR) measurements of Pt Hall bars on antiferromagnetic NiO(111) single crystals. An SMR with a sign opposite to conventional SMR is observed over a wide range of temperatures as well as magnetic fields stronger than 0.25 T. The negative sign of the SMR can b...

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Veröffentlicht in:Applied physics letters 2017-07, Vol.111 (5)
Hauptverfasser: Hoogeboom, Geert R., Aqeel, Aisha, Kuschel, Timo, Palstra, Thomas T. M., van Wees, Bart J.
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container_issue 5
container_start_page
container_title Applied physics letters
container_volume 111
creator Hoogeboom, Geert R.
Aqeel, Aisha
Kuschel, Timo
Palstra, Thomas T. M.
van Wees, Bart J.
description We report on spin Hall magnetoresistance (SMR) measurements of Pt Hall bars on antiferromagnetic NiO(111) single crystals. An SMR with a sign opposite to conventional SMR is observed over a wide range of temperatures as well as magnetic fields stronger than 0.25 T. The negative sign of the SMR can be explained by the alignment of magnetic moments being almost perpendicular to the external magnetic field within the easy plane (111) of the antiferromagnet. This correlation of magnetic moment alignment and the external magnetic field direction is realized just by the easy-plane nature of the material without the need of any exchange coupling to an additional ferromagnet. The SMR signal strength decreases with increasing temperature, primarily due to the decrease in Néel order by including fluctuations. An increasing magnetic field increases the SMR signal strength as there are fewer domains, and the magnetic moments are more strongly manipulated at high magnetic fields. The SMR is saturated at an applied magnetic field of 6 T, resulting in a spin-mixing conductance of ∼1018 Ω−1 m−2, which is comparable to that of Pt on insulating ferrimagnets such as yttrium iron garnet. An argon plasma treatment doubles the spin-mixing conductance.
doi_str_mv 10.1063/1.4997588
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An increasing magnetic field increases the SMR signal strength as there are fewer domains, and the magnetic moments are more strongly manipulated at high magnetic fields. The SMR is saturated at an applied magnetic field of 6 T, resulting in a spin-mixing conductance of ∼1018 Ω−1 m−2, which is comparable to that of Pt on insulating ferrimagnets such as yttrium iron garnet. 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source AIP Journals Complete; Alma/SFX Local Collection
subjects Alignment
Antiferromagnetism
Applied physics
Argon plasma
Domains
Ferrimagnetism
Ferrimagnets
Ferromagnetism
Magnetic fields
Magnetic moments
Magnetism
Magnetoresistance
Magnetoresistivity
Nickel oxides
Resistance
Signal strength
Single crystals
Variation
Yttrium
Yttrium-iron garnet
title Negative spin Hall magnetoresistance of Pt on the bulk easy-plane antiferromagnet NiO
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