Current induced magnetization switching in spin valves

H. Y T Nguyen, H. Yi, S. J. Joo, Kyoung Jin Lee, K. H. Shin

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

Abstract

We have studied the current induced magnetization switching (CIMS) in cobalt-based spin valve structures. Two exchange bias spin valves with extended fixed ferromagnets adopted as a current lead have been chosen for the study. The difference between them is that in the first structure, labeled EBSV (Exchange-Biased Spin Valve), no nano-oxide layer (NOL) was applied, while in the second structure, named NOL-EBSV, a NOL is inserted into the exchange biased pinned ferromagnet lead. The CIMSs in these two structures and in a non-exchange biased one, called SSV serving as the reference sample, have been studied. The temperature and field dependence of switching current in EBSV and SSV are also investigated for a better understanding the effect of exchange pinning field on the CIMS. The experiment result of CIMS in the EBSV shows a significant reduction in switching current density by a factor of 4.8, compared with a non-exchange biased spin valve with similar layer thicknesses. A double large reduction of switching current density is observed in the NOL-EBSV. We qualitatively analyze the effect of the exchange bias pinning field as well as of the nano-oxide layer on the reduction of switching current. A quantitative interpretation of the enhancement of CIMS by nano-oxide layer has been done by a three dimensional calculation of spin transport in EBSV and NOL-EBSV.

Original languageEnglish
Title of host publication2006 IEEE Nanotechnology Materials and Devices Conference, NMDC
Pages184-185
Number of pages2
Volume1
DOIs
Publication statusPublished - 2006 Dec 1
Externally publishedYes
Event2006 IEEE Nanotechnology Materials and Devices Conference, NMDC - Gyeongju, Korea, Republic of
Duration: 2006 Oct 222006 Oct 25

Other

Other2006 IEEE Nanotechnology Materials and Devices Conference, NMDC
CountryKorea, Republic of
CityGyeongju
Period06/10/2206/10/25

Keywords

  • CIMS
  • Exchange-biased
  • Nano-oxide layer
  • Spin transfer torque
  • Spin valves

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Materials Science(all)

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    Nguyen, H. Y. T., Yi, H., Joo, S. J., Lee, K. J., & Shin, K. H. (2006). Current induced magnetization switching in spin valves. In 2006 IEEE Nanotechnology Materials and Devices Conference, NMDC (Vol. 1, pp. 184-185). [4388736] https://doi.org/10.1109/NMDC.2006.4388736