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Kondo physics in non-local metallic spin transport devices
L O'Brien1, M J Erickson2, D Spivak2
11] Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455, USA [2] Thin Film Magnetism, Department of Physics, Cavendish Laboratory, University of Cambridge, Cambridge CB3 0HE, UK.
Nature Communications
|May 31, 2014
Summary
The non-local spin-valve
Area of Science:
- Spintronics
- Condensed Matter Physics
- Materials Science
Background:
- Non-local spin-valves are crucial for spintronics, enabling charge and spin current separation.
- A key challenge is understanding the non-monotonic temperature dependence of spin accumulation in ferromagnetic/non-magnetic metal structures.
- This phenomenon, where spin signals decrease at low temperatures, has remained perplexing.
Purpose of the Study:
- To investigate the cause of the non-monotonic temperature dependence of spin accumulation in non-local spin-valves.
- To identify the correlation between local magnetic moment formation and suppressed spin signals.
- To explore methods for mitigating this suppression effect.
Main Methods:
- Studied a wide range of ferromagnetic/non-magnetic material combinations.
- Analyzed the formation of dilute local magnetic moments at interfaces.
- Investigated the influence of interdiffusion and Kondo effect on spin polarization and diffusion length.
- Examined the impact of inserting thin interlayers on spin suppression.
Main Results:
- Demonstrated a strong correlation between local magnetic moment formation and the observed non-monotonic spin accumulation.
- Showed that ferromagnetic/non-magnetic interdiffusion leads to local moments that suppress spin polarization and diffusion length.
- Identified the Kondo effect as the mechanism responsible for this suppression.
- Confirmed that inserting a non-moment-supporting interlayer effectively quenches the suppression.
Conclusions:
- The non-monotonic temperature dependence in non-local spin-valves is attributed to local magnetic moments formed via interdiffusion.
- These local moments, influenced by the Kondo effect, significantly reduce spin polarization and diffusion length.
- Interface engineering, specifically using interlayers, can overcome these detrimental effects, paving the way for improved spintronic devices.
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