Scholarlink

<p>The Arrhenius law governs thermally-activated phenomena with a pre-exponential factor, the attempt time <i>τ</i><sub>0</sub>, which defines the time constant of stochastic process. In nanomagnets, accessing <i>τ</i><sub>0</sub> is a formidable task due to the temperature-dependent magnetic properties that preclude the use of a standard Arrhenius plot and lead to the questionable assumption that <i>τ</i><sub>0</sub> = 1 ns for several decades. This is an untenable situation considering <i>τ</i><sub>0</sub>’s critical role in the performance of stochastic magnetic tunnel junctions (s-MTJs), particularly in the context of unconventional computing. Here we present a systematic measurement of <i>τ</i><sub>0</sub> and reveal the governing physics. By analyzing the random telegraph noise as a function of applied magnetic fields along the hard axis, we derive a magnetic version of the Arrhenius plot, arriving at <i>τ</i><sub>0</sub> = 3.7–12 ns depending on the perpendicular magnetic anisotropy. Furthermore, we reveal that the Suhl instability significantly increases <i>τ</i><sub>0</sub> by the emission of spin waves. The results renew the understanding of stochastic dynamics in nanomagnets, offering a route to design high-performance s-MTJs.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Stochastic switching time constant and instability in nanomagnets

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2026年4月21日

查看全文
  • Shun Kanai,
  • Keisuke Hayakawa,
  • Mehrdad Elyasi,
  • Keito Kobayashi,
  • Junta Igarashi,
  • Butsurin Jinnai,
  • William A. Borders,
  • Gerrit E. W. Bauer,
  • Hideo Ohno,
  • Shunsuke Fukami

摘要

The Arrhenius law governs thermally-activated phenomena with a pre-exponential factor, the attempt time τ0, which defines the time constant of stochastic process. In nanomagnets, accessing τ0 is a formidable task due to the temperature-dependent magnetic properties that preclude the use of a standard Arrhenius plot and lead to the questionable assumption that τ0 = 1 ns for several decades. This is an untenable situation considering τ0’s critical role in the performance of stochastic magnetic tunnel junctions (s-MTJs), particularly in the context of unconventional computing. Here we present a systematic measurement of τ0 and reveal the governing physics. By analyzing the random telegraph noise as a function of applied magnetic fields along the hard axis, we derive a magnetic version of the Arrhenius plot, arriving at τ0 = 3.7–12 ns depending on the perpendicular magnetic anisotropy. Furthermore, we reveal that the Suhl instability significantly increases τ0 by the emission of spin waves. The results renew the understanding of stochastic dynamics in nanomagnets, offering a route to design high-performance s-MTJs.