The Enhancement of Temperature Gradient by Tunneling Spin Scattering in Magnetic Tunnel Junction

S. Liu, S. Hu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Magnetic Random Access Memory (MRAM) has attracted great attention for future nonvolatile memory devices application. However, it is still a challenge to realize the ultra-small, ultra-high-speed, and ultra-low-power consumption in the future MRAM technology [1]. The microwave-assisted switching (MAS) and thermal-assisted switching (TAS) are the essential technologies to improve MRAM performence [2], [3]. The thermo-spin injection, converting heat current to spin current, will be a new source to reverse the magnetic momentum by thermal spin-transfer torques. [4] Both the TAS scheme and the thermal spin-transfer torques effects are related to the heating process in the magnetic tunneling junction (MTJ). Therefore, it is important to explore the production and transport of heat flow in MTJs. In most electronic systems, the Joule heating effect is the main contributor to heat in nanodevices [5]. Meanwhile, the tunneling spin scattering heating is another critical heating source caused by the inelastic scattering to excite magnons and phonons in MTJs. [6]. Sousa et al. once used a heat equation in 1D structure to simulate the heat process with the tunneling electron heating [7]. They reported the importance of tunneling spin scattering on the temperature profiles in the ferromagnetic layers. However, the temperature gradient, which is the source of the thermal spin injection, has not been considered seriously. Here, we systematically studied the temperature and temperature gradient induced by the tunneling spin scattering in MTJ using 3D numerical simulations.

Original languageEnglish
Title of host publication32nd Magnetic Recording Conference, TMRC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781665440370
DOIs
Publication statusPublished - 2021
Externally publishedYes
Event32nd Magnetic Recording Conference, TMRC 2021 - Virtual, Pittsburgh, United States
Duration: Aug 16 2021Aug 19 2021

Publication series

Name32nd Magnetic Recording Conference, TMRC 2021

Conference

Conference32nd Magnetic Recording Conference, TMRC 2021
Country/TerritoryUnited States
CityVirtual, Pittsburgh
Period8/16/218/19/21

All Science Journal Classification (ASJC) codes

  • Media Technology
  • Electronic, Optical and Magnetic Materials
  • Instrumentation

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