Hoogeboom, Geert R. and Aqeel, Aisha and Kuschel, Timo and Palstra, Thomas T. M. and van Wees, Bart J. (2017) Negative spin Hall magnetoresistance of Pt on the bulk easy-plane antiferromagnet NiO. APPLIED PHYSICS LETTERS, 111 (5): 052409. ISSN 0003-6951, 1077-3118
Full text not available from this repository. (Request a copy)Abstract
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 Neel 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 similar to 10(18) Omega(-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. Published by AIP Publishing.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | DOMAINS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Chair Professor Back > Group Christian Back |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Dec 2018 13:16 |
| Last Modified: | 27 Feb 2019 10:33 |
| URI: | https://pred.uni-regensburg.de/id/eprint/1516 |
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