Properties of magnetic tunneling junction devices with characteristic sizes in sub-5-nm range

Brayan Navarrete, Mark Stone, Kevin Luongo, Ping Wang, Ali Hadjikhani, Jeongmin Hong, Jeffrey Bokor, Sakhrat Khizroev

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

Abstract

Nanomagnetic devices in -The sub-5-nm size range still do not exist, not only because of many fabrication and characterization challenges but also because of -The poorly understood physics in this size range. Previous experimental studies from various groups have shown that -The spin relaxation time can be increased by orders of magnitude with this size reduction. The increased spin lifetime leads to a combination of effects such as spin accumulation and tunneling magnetoresistance enhancement which in turn can significantly and favorably affect -The device performance [1]. The goal of this study is to exploit this new physics through fabrication and testing of magnetic tunneling junction (MTJ) devices with a characteristic size of below 5 nm. To achieve this goal, we integrate magnetic nanoparticles into MTJ structures and measure -Their key properties such as I-V curves and magnetoresistance dependencies. The nanoparticles, with sizes ranging from below 2 to over 10 nm, are made of -The ferrimagnetic spinel ferrite CoFe2O4 using co-precipitation chemistry. It has been -Theoretically predicted that -These nanoparticles become half-metallic in this size range and thus can lead to unprecedented high magnetoresistance values. Indeed, -The nanodevices under study display spin-filtering properties, as confirmed through measurements of magnetoresistance and I-V dependences [2]. This paper summarizes -The measured room-temperature anomalous magnetoresistance and I-V curves with a Coulomb-staircase-like dependence characteristic of a single-electron transport.

Original languageEnglish (US)
Title of host publication2017 5th Berkeley Symposium on Energy Efficient Electronic Systems, E3S 2017 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1-3
Number of pages3
ISBN (Electronic)9781538632901
DOIs
StatePublished - Jun 28 2017
Event5th Berkeley Symposium on Energy Efficient Electronic Systems, E3S 2017 - Berkeley, United States
Duration: Oct 19 2017Oct 20 2017

Publication series

Name2017 5th Berkeley Symposium on Energy Efficient Electronic Systems, E3S 2017 - Proceedings
Volume2018-January

Conference

Conference5th Berkeley Symposium on Energy Efficient Electronic Systems, E3S 2017
Country/TerritoryUnited States
CityBerkeley
Period10/19/1710/20/17

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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