Independence of the spin current from the Neél vector orientation in antiferromagnet CoO

Yang, M.; Li, Q.; Hou, D.; Shafer, P.; N'Diaye, A. T.; Klewe, C.; Wang, T. Y.; Zhang, Xixiang; Hwang, C.; Qiu, Z. Q.

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2020-06-11

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http://hdl.handle.net/10754/664027

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Abstract

Spin pumping from ferromagnetic Fe into antiferromagnetic CoO across a Ag spacer layer was studied using ferromagnetic resonance (FMR) in Py/CoO/Ag/Fe/Ag(001). The thin Py film on top of CoO permits an alignment of the CoO Neél vector through field cooling in two otherwise equivalent [110] and [110] crystalline axes which are parallel and perpendicular to the Fe magnetization direction, respectively. Fe FMR linewidth is measured as a function of Ag thickness in 10-20-GHz frequency range and in 180-330 K temperature range. We find that there exists an anisotropy in the Fe FMR damping for parallel and perpendicular alignment of the Fe and CoO spins. However, such anisotropic damping exists only at thin Ag thickness where there exists a magnetic interlayer coupling between Fe and CoO, and vanishes at thick Ag thickness where the interlayer coupling becomes negligible but permitting spin-current transmission into CoO. Our result indicates the absence of anisotropic spin current for parallel and perpendicular alignment of the Fe and CoO spin axes.

Citation

Yang, M., Li, Q., Hou, D., Shafer, P., N’Diaye, A. T., Klewe, C., … Qiu, Z. Q. (2020). Independence of the spin current from the Néel vector orientation in antiferromagnet CoO. Physical Review B, 101(22). doi:10.1103/physrevb.101.224418

Sponsors

The project was primarily supported by US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE-AC02-05CH112311 (van der Waals heterostructures program, KCWF16). This work was also supported by King Abdullah University of Science and Technology (KAUST), Office of Sponsored Research (OSR) and under the Award No. OSR-2017-CRG6-3427, Future Materials Discovery Program through the National Research Foundation of Korea (Grant No. 2015M3D1A1070467), Science Research Center Program through the National Research Foundation of Korea (Grant No. 2015R1A5A1009962). This research used resources of the Advanced Light Source, which is a DOE Office of Science User Facility under Contract No. DE-AC02-05CH11231.