Direct detection of pure spin-current by x-ray pump-probe measurements
J. Li, L. R. Shelford, P. Shafer, A. Tan, J. X. Deng, P. S. Keatley,, C. Hwang, E. Arenholz, G. van der Laan, R. J. Hicken, and Z. Q. Qiu
TL;DR
This study demonstrates direct detection of pure spin currents using synchronized microwave and x-ray pump-probe measurements, revealing phase behavior and element-specific spin dynamics in a multilayer structure.
Contribution
It introduces a novel x-ray pump-probe technique to directly observe and characterize pure spin currents with element specificity and phase resolution.
Findings
Direct detection of AC spin current in Cu75Mn25 layer.
Observation of bipolar phase behavior of Co spins.
Element-specific, time-resolved measurement of spin dynamics.
Abstract
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.
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