Low frequency noise characterization of CoFeB/MgO/CoFeB MTJ based perpendicular field sensor

Y. Lee, B. Das, L. Li, Y. Suen, L. Horng, T. Wu, C. Chang, J. Wu

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

Abstract

In a magnetic tunnel junction (MTJ) device, the potential barrier height of the barrier layer, in presence of a bias voltage or an external magnetic field, can be affected by defects present in the barrier layer or at the barrier layer/ferromagnetic (FM) layer interfaces of the device. The defects may have structural as well as magnetic origin. Fluctuations of such defects (with a time scale that corresponds to low frequency regime of <10 kHz) can significantly change the tunnelling probability of conduction electrons through the insulating barrier layer leading to resistance fluctuations and hence affecting the device performance at that frequency range. Hence, considerable efforts have been made to understand the nature of the fluctuations and to find the ways to minimize it but, mostly have done for the MTJ devices that have parallel (or anti-parallel) configuration of the free and pinned layer magnetizations. Here, we are reporting low frequency electrical noise study of micron sized and elliptical shaped Co40Fe40B20/MgO/ Co20Fe60B20 based MTJ devices which have the reference and sensing layer magnetization directions along the out of plane and in plane directions, respectively designed for high sensitive perpendicular magnetic field sensor application.

Original languageEnglish
Title of host publication2015 IEEE International Magnetics Conference, INTERMAG 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479973224
DOIs
Publication statusPublished - 2015 Jul 14
Event2015 IEEE International Magnetics Conference, INTERMAG 2015 - Beijing, China
Duration: 2015 May 112015 May 15

Publication series

Name2015 IEEE International Magnetics Conference, INTERMAG 2015

Other

Other2015 IEEE International Magnetics Conference, INTERMAG 2015
CountryChina
CityBeijing
Period15-05-1115-05-15

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All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this

Lee, Y., Das, B., Li, L., Suen, Y., Horng, L., Wu, T., ... Wu, J. (2015). Low frequency noise characterization of CoFeB/MgO/CoFeB MTJ based perpendicular field sensor. In 2015 IEEE International Magnetics Conference, INTERMAG 2015 [7156769] (2015 IEEE International Magnetics Conference, INTERMAG 2015). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/INTMAG.2015.7156769