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Direct detection of pure AC spin-current by x-ray pump-probe measurements

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posted on 2025-07-31, 15:29 authored by J. Li, Shelford, P. Shafer, A. Tan, J. X. Deng, P. S. Keatley, C. Hwang, E. Arenholz, G. van der Laan, RJ Hicken, Z. Q. Qiu
Despite recent progress in spin-current research, the detection of spin current has mostly remained indirect. By synchronizing a microwave waveform with synchrotron x-ray pulses, we use the ferromagnetic resonance of the Py (Ni81Fe19) layer in a Py/Cu/Cu75Mn25/Cu/Co multilayer to pump a pure AC spin current into the Cu75Mn25 and Co layers, and then directly probe the spin current within the Cu75Mn25 layer and the spin dynamics of the Co layer by x-ray magnetic circular dichroism. This element-resolved pump-probe measurement unambiguously identifies the AC spin current in the Cu75Mn25 layer.

Funding

We acknowledge helpful discussion with Arne Brataas. Financial support from National Science Foundation DMR-1504568 NRF through the Global Research Laboratory project of Korea is gratefully acknowledged. The Advanced Light Source is supported by the US Department of Energy under contract number DE-AC02-05CH11231. JD acknowledges fellowship support from the China Scholarship Council and National Science Foundation of China under Grant Nos. 51331006. LRS, PSK, and RJH acknowledge the support of the Engineering and Physical Sciences Research Council (EPSRC) through grants EP/J018767/1 and EP/I038470/1. GvdL acknowledges support of the EPSRC through grant EP/J018767/1.

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    Handle - References https://hdl.handle.net/10871/26876
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    ISSN - Is published in https://portal.issn.org/resource/ISSN/1079-7114

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This is the author accepted manuscript. The final version is available from the American Physical Society via the DOI in this record.

Notes

There is another ORE record for this article: http://hdl.handle.net/10871/26876

External DOI

Journal

Physical Review Letters

Publisher

American Physical Society

Language

en

FOA date

2019-09-27T08:31:53Z

Citation

Vol, 117, article 076602

Department

  • Physics and Astronomy

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