Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3280378
Keywords
ferromagnetic materials; ferromagnetic resonance; interface magnetism; iron alloys; magnesium compounds; magnetic tunnelling; nickel alloys; platinum; spin Hall effect
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Funding
- U.S. Department of Energy, Office of Science, Basic Energy Sciences [DE-AC02-06CH11357]
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Spin-pumping generates pure spin currents in normal metals at the ferromagnet (F)/normal metal (N) interface. The efficiency of spin-pumping is given by the spin mixing conductance, which depends on N and the F/N interface. We directly study the spin-pumping through an MgO tunnel-barrier using the inverse spin Hall effect, which couples spin and charge currents and provides a direct electrical detection of spin currents in the normal metal. We find that spin-pumping is suppressed by the tunnel-barrier, which is contrary to recent studies that suggest that the spin mixing conductance can be enhanced by a tunnel-barrier inserted at the interface.
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