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

doi:10.1109/TMAG.2012.2198795

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

ENG - Applied Physics

Research output: Contribution to journal › Article

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 language	English
Article number	6332729
Pages (from-to)	2812-2815
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	48
Issue number	11
DOIs	https://doi.org/10.1109/TMAG.2012.2198795
Publication status	Published - 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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Yu, T., Naganuma, H., Shi, D. W., Ando, Y., & Han, X. F. (2012). Magnetic properties and magnetic domain structures evolution modulated by CoFeB layer in [Pd/Co]/CoFeB/MgO/CoFeB/[Co/Pd] perpendicular MTJ films. IEEE Transactions on Magnetics, 48(11), 2812-2815. [6332729]. https://doi.org/10.1109/TMAG.2012.2198795

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

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.",

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AU - Yu, T.

AU - Naganuma, H.

AU - Shi, D. W.

AU - Ando, Y.

AU - Han, X. F.

PY - 2012/10/29

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N2 - 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.

AB - 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.

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KW - magnetic tunneling junction

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