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Design and Characterization Methodology for Efficient Wide Range Tunable MEMS Filters

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Electrically tunable spin injector free from the impedance mismatch problem.

K Ando, S Takahashi, J Ieda

Nature Materials

|June 28, 2011

Summary

This summary is machine-generated.

Spin pumping enables efficient spin injection into semiconductors like GaAs via Ohmic contacts, overcoming impedance mismatch issues. This method allows electrical control over spin-pumping efficiency at room temperature.

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Area of Science:

Solid-state physics
Materials science
Spintronics

Background:

Spin current injection is vital for spintronics, but impedance mismatch limits efficiency in high-resistivity materials.
Current methods rely on tunnel barriers, hindering spin injection through low-resistivity Ohmic contacts.

Discussion:

Spin pumping demonstrates a viable method for spin injection into semiconductors via Ohmic contacts, bypassing the need for tunnel barriers.
Room-temperature spin injection into Gallium Arsenide (GaAs) from Nickel-Iron (Ni(81)Fe(19)) is achieved through dynamical spin exchange.

Key Insights:

Spin pumping enables efficient spin injection without impedance matching issues.
Electrical control of spin-pumping efficiency is demonstrated by applying bias voltage across the Ni(81)Fe(19)/GaAs interface.

Outlook:

This research opens new avenues for versatile and easy spin injection in spintronic devices.
Potential for electric-field-controlled spintronic functionalities at room temperature.