2020 Fiscal Year Annual Research Report
Dynamics-based neuromorphic properties of spintronics devices
| Project/Area Number |
19K15428
|
|---|
| Research Institution | Tohoku University |
|---|
Principal Investigator |
KURENKOV ALEKSANDR 東北大学, 先端スピントロニクス研究開発センター, 学術研究員 (80830645)
|
|---|
| Project Period (FY) |
2019-04-01 – 2021-03-31
|
| Keywords | Spintronics / Spin-orbit torque / Fast switching / Antiferromagnet / Exchange bias / Synapse / Neuron |
|---|
| Outline of Annual Research Achievements |
In FY2020 we have clarified the microscopic mechanism behind magnetic domains formation during spin-orbit torque switching in ferromagnet/antiferromagnet (FM/AFM) stacks. The key finding is that variation of exchange bias (EB), which causes non-binary behavior happens at a fine scale of the stack grain size i.e. ~ 15 nm. At this scale, exchange interaction at the FM/AFM interface acts in monocrystalline environment and thus can be as large as hundreds of mT. Much weaker EB of ~20-40 mT, previously measured at the FM domain level (~ 200 nm in effective diameter) is, in fact, averaged over multiple grains. The new picture of tiny pinning sites with strongly varied potential at FM/AFM interface is crucial for understanding of EB and engineering of control pulses for neuromorphic applications.
|
Research Products
(3 results)
