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Experimental test of the spin mixing interface conductivity concept.
Mathias Weiler1, Matthias Althammer, Michael Schreier
1Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, 85748 Garching, Germany.
Physical Review Letters
|November 12, 2013
Summary
This study confirms that spin pumping, spin Seebeck, and spin Hall magnetoresistance effects are purely spintronic. The findings quantitatively support existing spin current theories for yttrium iron garnet/Pt systems.
Area of Science:
- Condensed matter physics
- Materials science
- Spintronics
Background:
- Spintronic effects like spin pumping, spin Seebeck, and spin Hall magnetoresistance are crucial for next-generation electronics.
- Understanding their underlying mechanisms and interrelations is essential for device optimization.
- Experimental verification of theoretical models is key to advancing the field.
Purpose of the Study:
- To quantitatively compare spin pumping, spin Seebeck, and spin Hall magnetoresistance (SMR) effects.
- To validate theoretical models based on spin currents.
- To establish the purely spintronic nature of these phenomena.
Main Methods:
- Fabrication and characterization of over 20 yttrium iron garnet/platinum (YIG/Pt) samples.
- Detection of spin pumping, spin Seebeck, and SMR effects via the inverse spin Hall effect (ISHE).
- Quantitative analysis using established parameters like spin mixing conductance, spin Hall angle, and spin diffusion length.
Main Results:
- Experimental data fully support theoretical models exclusively based on spin currents.
- A single set of plausible parameters consistently describes all investigated effects.
- Quantitative description of the spin Seebeck effect is provided.
Conclusions:
- The investigated phenomena (spin pumping, spin Seebeck, SMR) are confirmed to be purely spintronic.
- The study provides robust quantitative support for current-based spintronic theories.
- The findings offer a clear framework for understanding and utilizing these effects in spintronic devices.
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