Perpendicular magnetic anisotropy of a Ta/NiFeB/MgO system and its magnetic coupling with [Pt/Co] multilayers

Young Chan Won; Sang Ho Lim

doi:10.1016/j.jallcom.2020.157678

Perpendicular magnetic anisotropy of a Ta/NiFeB/MgO system and its magnetic coupling with [Pt/Co] multilayers

Young Chan Won, Sang Ho Lim

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

The perpendicular magnetic anisotropy (PMA) and crystalline structure of Ta/NiFeB/MgO stacks are investigated. When the stack is annealed, PMA is induced and the magnetic moment increases due to the crystallization of bcc NiFe from amorphous NiFeB. This structure is combined with [Pt/Co]₆ multilayers to study the change in the magnetic coupling and PMA behavior with the change in the Ta thickness inserted in-between and the annealing temperature. Among the [Pt/Co]₆/Ta/NiFeB/MgO stacks, the stack with a 0.5-nm-thick Ta layer shows the strongest PMA with an effective PMA energy density of 4.4 × 10⁶ erg/cm³ upon annealing at 400 °C. Further, the X-ray diffraction study of the crystalline structures confirms the formation of the NiFe (001) phase, which is essential for achieving a high tunneling magnetoresistance ratio.

Original language	English
Article number	157678
Journal	Journal of Alloys and Compounds
Volume	858
DOIs	https://doi.org/10.1016/j.jallcom.2020.157678
Publication status	Published - 2021 Mar 25

Bibliographical note

Funding Information:
This work was supported by the Creative Materials Discovery Program through the National Research Foundation of Korea [grant number 2015M3D1A1070465 ].

Keywords

Magnetic films and multilayers
Perpendicular magnetic anisotropy
Ta/NiFeB/MgO
Template effect
[Pt/Co] multilayers

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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title = "Perpendicular magnetic anisotropy of a Ta/NiFeB/MgO system and its magnetic coupling with [Pt/Co] multilayers",

abstract = "The perpendicular magnetic anisotropy (PMA) and crystalline structure of Ta/NiFeB/MgO stacks are investigated. When the stack is annealed, PMA is induced and the magnetic moment increases due to the crystallization of bcc NiFe from amorphous NiFeB. This structure is combined with [Pt/Co]6 multilayers to study the change in the magnetic coupling and PMA behavior with the change in the Ta thickness inserted in-between and the annealing temperature. Among the [Pt/Co]6/Ta/NiFeB/MgO stacks, the stack with a 0.5-nm-thick Ta layer shows the strongest PMA with an effective PMA energy density of 4.4 × 106 erg/cm3 upon annealing at 400 °C. Further, the X-ray diffraction study of the crystalline structures confirms the formation of the NiFe (001) phase, which is essential for achieving a high tunneling magnetoresistance ratio.",

keywords = "Magnetic films and multilayers, Perpendicular magnetic anisotropy, Ta/NiFeB/MgO, Template effect, [Pt/Co] multilayers",

author = "Won, {Young Chan} and Lim, {Sang Ho}",

note = "Funding Information: This work was supported by the Creative Materials Discovery Program through the National Research Foundation of Korea [grant number 2015M3D1A1070465 ].",

year = "2021",

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day = "25",

doi = "10.1016/j.jallcom.2020.157678",

language = "English",

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journal = "Journal of Alloys and Compounds",

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T1 - Perpendicular magnetic anisotropy of a Ta/NiFeB/MgO system and its magnetic coupling with [Pt/Co] multilayers

AU - Won, Young Chan

AU - Lim, Sang Ho

N1 - Funding Information: This work was supported by the Creative Materials Discovery Program through the National Research Foundation of Korea [grant number 2015M3D1A1070465 ].

PY - 2021/3/25

Y1 - 2021/3/25

N2 - The perpendicular magnetic anisotropy (PMA) and crystalline structure of Ta/NiFeB/MgO stacks are investigated. When the stack is annealed, PMA is induced and the magnetic moment increases due to the crystallization of bcc NiFe from amorphous NiFeB. This structure is combined with [Pt/Co]6 multilayers to study the change in the magnetic coupling and PMA behavior with the change in the Ta thickness inserted in-between and the annealing temperature. Among the [Pt/Co]6/Ta/NiFeB/MgO stacks, the stack with a 0.5-nm-thick Ta layer shows the strongest PMA with an effective PMA energy density of 4.4 × 106 erg/cm3 upon annealing at 400 °C. Further, the X-ray diffraction study of the crystalline structures confirms the formation of the NiFe (001) phase, which is essential for achieving a high tunneling magnetoresistance ratio.

AB - The perpendicular magnetic anisotropy (PMA) and crystalline structure of Ta/NiFeB/MgO stacks are investigated. When the stack is annealed, PMA is induced and the magnetic moment increases due to the crystallization of bcc NiFe from amorphous NiFeB. This structure is combined with [Pt/Co]6 multilayers to study the change in the magnetic coupling and PMA behavior with the change in the Ta thickness inserted in-between and the annealing temperature. Among the [Pt/Co]6/Ta/NiFeB/MgO stacks, the stack with a 0.5-nm-thick Ta layer shows the strongest PMA with an effective PMA energy density of 4.4 × 106 erg/cm3 upon annealing at 400 °C. Further, the X-ray diffraction study of the crystalline structures confirms the formation of the NiFe (001) phase, which is essential for achieving a high tunneling magnetoresistance ratio.

KW - Magnetic films and multilayers

KW - Perpendicular magnetic anisotropy

KW - Ta/NiFeB/MgO

KW - Template effect

KW - [Pt/Co] multilayers

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JO - Journal of Alloys and Compounds

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Perpendicular magnetic anisotropy of a Ta/NiFeB/MgO system and its magnetic coupling with [Pt/Co] multilayers

Abstract

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Keywords

ASJC Scopus subject areas

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