Direct detection of pure spin-current by x-ray pump-probe measurements
| Autor: | J. Li, Z. Q. Qiu, R. J. Hicken, J. X. Deng, L. R. Shelford, P. Shafer, Chanyong Hwang, Elke Arenholz, Paul Steven Keatley, G. van der Laan, A. Tan |
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| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Condensed Matter - Materials Science
Materials science Magnetic circular dichroism Analytical chemistry X-ray General Physics and Astronomy Materials Science (cond-mat.mtrl-sci) FOS: Physical sciences 02 engineering and technology Spin current 021001 nanoscience & nanotechnology 01 natural sciences Ferromagnetic resonance Synchrotron law.invention Condensed Matter::Materials Science law 0103 physical sciences Waveform Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Layer (electronics) Microwave |
| Popis: | By synchronizing a microwave waveform with the synchrotron x-ray pulses, we use the ferromagnetic resonance (FMR) of the Py (Ni81Fe19) layer in a Py/Cu/Cu75Mn25/Cu/Co multilayer to pump a pure spin current into the Cu75Mn25 spacer layer, and then directly probe the spin current in the Cu75Mn25 layer by a time-resolved x-ray magnetic circular dichroism (XMCD). This element-specific pump-probe measurement unambiguously identifies the AC spin current in the Cu75Mn25 layer. In addition, phase resolved x-ray measurements reveal a characteristic bipolar phase behavior of the Co spins that is a fingerprint of spin-current driven spin precession. |
| Databáze: | OpenAIRE |
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