Efficient spin transport across a disordered interface in a low damping magnetic insulator/heavy metal bilayer
Abstract
We demonstrate efficient spin transfer across a disordered interfacial layer that forms in low damping ferrimagnetic insulator lithium aluminum ferrite (LAFO) and tantalum bilayers. Despite the interfacial disorder, confirmed by transmission electron microscopy, we find a room temperature interfacial spin mixing conductance on the order of 1014 Ω−1m−2 similar to other LAFO-based bilayers with epitaxial interfaces. Broadband ferromagnetic resonance measurements confirm a linewidth broadening in LAFO following the addition of a Ta layer, consistent with the effects of spin pumping. Furthermore, the presence of spin current generated in the Ta layer by spin pumping is confirmed with inverse spin Hall effect measurements. Measurements of the Ta thickness dependence of the spin Hall magnetoresistance and the Gilbert damping enhancement indicate that the Ta spin diffusion length is on the order of 1 nm. This work not only provides a surprising example of efficient spin transport across a disordered interface but also demonstrates the potential for low damping spinel ferrites as a robust system for efficient spin wave spintronics.
Article Details
Journal Info
Applied Physics Letters
American Institute of Physics
Authors (12)
S. P. Alaei
Department of Physics, Stanford University 1 , Stanford, California 94305,
R. Raj
Department of Chemical Engineering and Materials Science, University of Minnesota 3 , Minneapolis, Minnesota 55455,
S. Channa
Department of Physics, Stanford University 1 , Stanford, California 94305,
L. Takana
Geballe Laboratory for Advanced Materials, Stanford University 2 , Stanford, California 94305,
D. O'Mahoney
Geballe Laboratory for Advanced Materials, Stanford University 2 , Stanford, California 94305,
X. Y. Zheng
Geballe Laboratory for Advanced Materials, Stanford University 2 , Stanford, California 94305,
E. E. Fleck
Geballe Laboratory for Advanced Materials, Stanford University 2 , Stanford, California 94305,
T.-Y. Chen
Department of Physics, Center for Quantum Phenomena, New York University 6 , New York, New York 10003,
Z. Galazka
Leibniz-Institut für Kristallzüchtung 7 , Max-Born-Str. 2, 12489 Berlin,
A. D. Kent
Department of Physics, Center for Quantum Phenomena, New York University 6 , New York, New York 10003,
K. A. Mkhoyan
Department of Chemical Engineering and Materials Science, University of Minnesota 3 , Minneapolis, Minnesota 55455,
Y. Suzuki
Geballe Laboratory for Advanced Materials, Stanford University 2 , Stanford, California 94305,