Magnetic properties and magnetic domain structures evolution modulated by CoFeB layer in [Pd/Co]/CoFeB/MgO/CoFeB/[Co/Pd] perpendicular MTJ films

T. Yu, H. Naganuma, D. W. Shi, Y. Ando, X. F. Han

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

A series of MgO perpendicular magnetic tunneling junction (p-MTJ) films with soft/hard composite electrodes is prepared by RF-sputtering, where amorphous CoFeB is chosen as soft layer. The modulation of MTJs film magnetic properties on CoFeB thickness is investigated. The critical thickness for composite free layer transform from rigid magnet (RM) to exchange spring system (ES) is indentified. Besides, an unexpected in-plane exchange bias is observed which is attributed to the formation of closure domains. The evolution of domain structures on CoFeB is examined by magnetic force microscope. Coexistence of two distinguished magnetic domains of different sizes is observed. It is found that the evolution of domain morphology as varying CoFeB thickness is due to the modulation of effective anisotropy.

Original languageEnglish
Article number6332729
Pages (from-to)2812-2815
Number of pages4
JournalIEEE Transactions on Magnetics
Volume48
Issue number11
DOIs
Publication statusPublished - 2012 Oct 29

Keywords

  • Domain structure
  • exchange coupling
  • magnetic tunneling junction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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