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Anisotropic Absorption of Pure Spin Currents

DOI: 10.1103/PhysRevLett.116.047201 DOI Help
PMID: 26871353 PMID Help

Authors: A. A. Baker (Diamond Light Source) , A. I. Figueroa-garcia (Diamond Light Source) , C. J. Love (Diamond Light Source) , S. A. Cavill (University of York, Diamond Light Source) , T. Hesjedal (University of Oxford; , Diamond Light Source) , G. Van Der Laan (Diamond Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 116 , PAGES 047201

State: Published (Approved)
Published: January 2016
Diamond Proposal Number(s): 11501

Open Access Open Access

Abstract: Spin transfer in magnetic multilayers offers the possibility of ultrafast, low-power device operation. We report a study of spin pumping in spin valves, demonstrating that a strong anisotropy of spin pumping from the source layer can be induced by an angular dependence of the total Gilbert damping parameter, alpha, in the spin sink layer. Using lab- and synchrotron-based ferromagnetic resonance, we show that an in-plane variation of damping in a crystalline Co50Fe50 layer leads to an anisotropic alpha in a polycrystalline Ni81Fe19 layer. This anisotropy is suppressed above the spin diffusion length in Cr, which is found to be 8 nm, and is independent of static exchange coupling in the spin valve. These results offer a valuable insight into the transmission and absorption of spin currents, and a mechanism by which enhanced spin torques and angular control may be realized for next-generation spintronic devices.

Subject Areas: Physics, Materials, Information and Communication Technology


Instruments: I10-Beamline for Advanced Dichroism

Other Facilities: Advanced Light Source