An ac small signal model for lateral spin valves (LSVs) is developed, and is applied to two different types of devices: spin transmitters and magnetic field sensors. The small signal models explicitly decouple the charge- and spin-dependent components, which describe the intrinsic RC delay and the ac spin accumulation dynamics, separately. The analysis is applied to graphene LSVs as an example to illustrate the optimization strategies for LSV devices. By using the charge-spin circuit model, the scattering parameters and the reflection coefficients at the output terminals are quantitatively calculated as a function of frequency. This model can be used as a guide for future LSV design and to benchmark performance across different material systems.
Bibliographical noteFunding Information:
This work was supported by Seagate Technology PLC, Cupertino, CA, USA.
ACKNOWLEDGMENT This work was supported by Seagate Technology PLC, Cupertino, CA, USA. The authors would like to thank Dr. M. S. Patwari for fruitful discussions and R. Ma for reviewing the manuscript.
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- AC transmitter
- lateral spin valves (LSVs)
- magnetic field sensor
- small signal model
- spin accumulation