AC Small-Signal Model for Magnetoresistive Lateral Spin Valves

Jiaxi Hu, David A. Deen, Steven J. Koester

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Article number8468230
JournalIEEE Transactions on Magnetics
Volume55
Issue number3
DOIs
StatePublished - Mar 2019

Bibliographical note

Funding Information:
This work was supported by Seagate Technology PLC, Cupertino, CA, USA.

Funding Information:
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.

Publisher Copyright:
© 1965-2012 IEEE.

Copyright:
Copyright 2019 Elsevier B.V., All rights reserved.

Keywords

  • AC transmitter
  • lateral spin valves (LSVs)
  • magnetic field sensor
  • small signal model
  • spin accumulation

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