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

Authors
Won, Young ChanLim, Sang Ho
Issue Date
25-3월-2021
Publisher
ELSEVIER SCIENCE SA
Keywords
Magnetic films and multilayers; Perpendicular magnetic anisotropy; Ta/NiFeB/MgO; Template effect; [Pt/Co] multilayers
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.858
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF ALLOYS AND COMPOUNDS
Volume
858
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/137735
DOI
10.1016/j.jallcom.2020.157678
ISSN
0925-8388
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 x 10(6) erg/cm(3) upon annealing at 400 degrees 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. (C) 2020 Elsevier B.V. All rights reserved.
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공과대학 (신소재공학부)
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