2022年7月
Local bifurcation with spin-transfer torque in superparamagnetic tunnel junctions
Nature Communications
- ,
- ,
- ,
- ,
- 巻
- 13
- 号
- 1
- 記述言語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1038/s41467-022-31788-1
Modulation of the energy landscape by external perturbations governs various thermally-activated phenomena, described by the Arrhenius law. Thermal fluctuation of nanoscale magnetic tunnel junctions with spin-transfer torque (STT) shows promise for unconventional computing, whereas its rigorous representation, based on the Néel-Arrhenius law, has been controversial. In particular, the exponents for thermally-activated switching rate therein, have been inaccessible with conventional thermally-stable nanomagnets with decade-long retention time. Here we approach the Néel-Arrhenius law with STT utilising superparamagnetic tunnel junctions that have high sensitivity to external perturbations and determine the exponents through several independent measurements including homodyne-detected ferromagnetic resonance, nanosecond STT switching, and random telegraph noise. Furthermore, we show that the results are comprehensively described by a concept of local bifurcation observed in various physical systems. The findings demonstrate the capability of superparamagnetic tunnel junction as a useful tester for statistical physics as well as sophisticated engineering of probabilistic computing hardware with a rigorous mathematical foundation.
- リンク情報
-
- DOI
- https://doi.org/10.1038/s41467-022-31788-1
- PubMed
- https://www.ncbi.nlm.nih.gov/pubmed/35835780
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85134131942&origin=inward 本文へのリンクあり
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85134131942&origin=inward
- ID情報
-
- DOI : 10.1038/s41467-022-31788-1
- eISSN : 2041-1723
- PubMed ID : 35835780
- SCOPUS ID : 85134131942