Length Scale of the Spin Seebeck Effect
Journal Article
·
· Physical Review Letters
- Johannes Gutenberg Univ., Mainz (Germany)
- Univ. of Konstanz, Konstanz (Germany)
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Technische Universität Kaiserslautern, Kaiserslautern (Germany); Argonne National Lab. (ANL), Lemont, IL (United States)
- Technische Universität Kaiserslautern, Kaiserslautern (Germany)
We study the origin of the spin Seebeck effect in yttrium iron garnet (YIG) samples for film thicknesses from 20 nm to 50 μm at room temperature and 50 K. Our results exhibit a characteristic increase of the longitudinal spin Seebeck effect amplitude with the thickness of the insulating ferrimagnetic YIG, which levels off at a critical thickness that increases with decreasing temperature. The observed behavior cannot be explained as an interface effect or by variations of the material parameters. Comparison to numerical simulations of thermal magnonic spin currents yields qualitative agreement for the thickness dependence resulting from the finite magnon propagation length. This allows us to trace the origin of the observed signals to genuine bulk magnonic spin currents due to the spin Seebeck effect ruling out an interface origin and allowing us to gauge the reach of thermally excited magnons in this system for different temperatures. At low temperature, even quantitative agreement with the simulations is found.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Solid-State Solar-Thermal Energy Conversion Center (S3TEC); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Organization:
- USDOE; USDOE SC Office of Basic Energy Sciences (SC-22)
- Grant/Contract Number:
- SC0001299
- OSTI ID:
- 1371003
- Alternate ID(s):
- OSTI ID: 1213287
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 9 Vol. 115; ISSN 0031-9007; ISSN PRLTAO
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
charge transport
defects
materials and chemistry by design
mechanical behavior
optics
synthesis (novel materials)
phonons
solar (photovoltaic)
solar (thermal)
solid state lighting
spin dynamics
synthesis (scalable processing)
synthesis (self-assembly)
thermal conductivity
thermoelectric
GENERAL PHYSICS
charge transport
defects
materials and chemistry by design
mechanical behavior
optics
synthesis (novel materials)
phonons
solar (photovoltaic)
solar (thermal)
solid state lighting
spin dynamics
synthesis (scalable processing)
synthesis (self-assembly)
thermal conductivity
thermoelectric