Perpendicular magnetic anisotropy and the magnetization process in CoFeB/Pd multilayer films

Duc-The Ngo; Duy-Truong  Quach; Tran Quang Hung; Kristian Mølhave; The-Long  Phan; Dong-Hyun  Kim

doi:10.1088/0022-3727/47/44/445001

Perpendicular magnetic anisotropy and the magnetization process in CoFeB/Pd multilayer films

Duc-The Ngo, Duy-Truong Quach, Tran Quang Hung, Kristian Mølhave, The-Long Phan, Dong-Hyun Kim

Chungbuk National University

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

The perpendicular magnetic anisotropy (PMA) and dynamic magnetization-reversal process in [CoFeB t nm/Pd 1.0 nm]_n(t = 0.4, 0.6, 0.8, 1.0 and 1.2 nm; n = 2 − 20) multilayer films have been studied by means of magnetic hysteresis and Kerr effect measurements. Strong and controllable PMA with an effective uniaxial anisotropy up to 7.7 × 10⁶ Jm⁻³ and a saturation magnetization as low as 200 emu cm⁻³ are achieved. The surface/interfacial anisotropy of the CoFeB/Pd interfaces—the main contribution to the PMA—is separated from the effective uniaxial anisotropy of the films and appears to increase with the number of CoFeB/Pd bilayers. Observation of the magnetic domains during a magnetization-reversal process, using polar magneto-optical Kerr microscopy, reveals the detailed behavior of the nucleation and displacement of the domain walls.

Original language	English
Article number	445001
Journal	Journal of Physics D: Applied Physics
Volume	47
Number of pages	7
ISSN	0022-3727
DOIs	https://doi.org/10.1088/0022-3727/47/44/445001
Publication status	Published - 2014

Keywords

Magnetic multilayer
Perpendicular magnetic anisotropy
Interfacial magnetism
Magnetic domains and domain walls
Magnetization reversal

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10.1088/0022-3727/47/44/445001

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title = "Perpendicular magnetic anisotropy and the magnetization process in CoFeB/Pd multilayer films",

abstract = "The perpendicular magnetic anisotropy (PMA) and dynamic magnetization-reversal process in [CoFeB t nm/Pd 1.0 nm]n(t = 0.4, 0.6, 0.8, 1.0 and 1.2 nm; n = 2 − 20) multilayer films have been studied by means of magnetic hysteresis and Kerr effect measurements. Strong and controllable PMA with an effective uniaxial anisotropy up to 7.7 × 106 Jm−3 and a saturation magnetization as low as 200 emu cm−3 are achieved. The surface/interfacial anisotropy of the CoFeB/Pd interfaces—the main contribution to the PMA—is separated from the effective uniaxial anisotropy of the films and appears to increase with the number of CoFeB/Pd bilayers. Observation of the magnetic domains during a magnetization-reversal process, using polar magneto-optical Kerr microscopy, reveals the detailed behavior of the nucleation and displacement of the domain walls.",

keywords = "Magnetic multilayer, Perpendicular magnetic anisotropy, Interfacial magnetism, Magnetic domains and domain walls, Magnetization reversal",

author = "Duc-The Ngo and Duy-Truong Quach and Hung, {Tran Quang} and Kristian M{\o}lhave and The-Long Phan and Dong-Hyun Kim",

year = "2014",

doi = "10.1088/0022-3727/47/44/445001",

language = "English",

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journal = "Journal of Physics D: Applied Physics",

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TY - JOUR

T1 - Perpendicular magnetic anisotropy and the magnetization process in CoFeB/Pd multilayer films

AU - Ngo, Duc-The

AU - Quach, Duy-Truong

AU - Hung, Tran Quang

AU - Mølhave, Kristian

AU - Phan, The-Long

AU - Kim, Dong-Hyun

PY - 2014

Y1 - 2014

N2 - The perpendicular magnetic anisotropy (PMA) and dynamic magnetization-reversal process in [CoFeB t nm/Pd 1.0 nm]n(t = 0.4, 0.6, 0.8, 1.0 and 1.2 nm; n = 2 − 20) multilayer films have been studied by means of magnetic hysteresis and Kerr effect measurements. Strong and controllable PMA with an effective uniaxial anisotropy up to 7.7 × 106 Jm−3 and a saturation magnetization as low as 200 emu cm−3 are achieved. The surface/interfacial anisotropy of the CoFeB/Pd interfaces—the main contribution to the PMA—is separated from the effective uniaxial anisotropy of the films and appears to increase with the number of CoFeB/Pd bilayers. Observation of the magnetic domains during a magnetization-reversal process, using polar magneto-optical Kerr microscopy, reveals the detailed behavior of the nucleation and displacement of the domain walls.

AB - The perpendicular magnetic anisotropy (PMA) and dynamic magnetization-reversal process in [CoFeB t nm/Pd 1.0 nm]n(t = 0.4, 0.6, 0.8, 1.0 and 1.2 nm; n = 2 − 20) multilayer films have been studied by means of magnetic hysteresis and Kerr effect measurements. Strong and controllable PMA with an effective uniaxial anisotropy up to 7.7 × 106 Jm−3 and a saturation magnetization as low as 200 emu cm−3 are achieved. The surface/interfacial anisotropy of the CoFeB/Pd interfaces—the main contribution to the PMA—is separated from the effective uniaxial anisotropy of the films and appears to increase with the number of CoFeB/Pd bilayers. Observation of the magnetic domains during a magnetization-reversal process, using polar magneto-optical Kerr microscopy, reveals the detailed behavior of the nucleation and displacement of the domain walls.

KW - Magnetic multilayer

KW - Perpendicular magnetic anisotropy

KW - Interfacial magnetism

KW - Magnetic domains and domain walls

KW - Magnetization reversal

U2 - 10.1088/0022-3727/47/44/445001

DO - 10.1088/0022-3727/47/44/445001

M3 - Journal article

SN - 0022-3727

VL - 47

JO - Journal of Physics D: Applied Physics

JF - Journal of Physics D: Applied Physics

M1 - 445001

ER -

Perpendicular magnetic anisotropy and the magnetization process in CoFeB/Pd multilayer films

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Keywords

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