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

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

^*Corresponding author for this work

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

Abstract

The perpendicular magnetic anisotropy (PMA) and dynamic magnetization-reversal process in [CoFeB t nm/Pd 1.0nm]_n (t=0.4, 0.6, 0.8, 1.0 and 1.2nm; 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 7.7×10⁶Jm^-3 and a saturation magnetization as low as 200emucm^-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
Issue number	44
DOIs	https://doi.org/10.1088/0022-3727/47/44/445001
Publication status	Published - 5 Nov 2014

Keywords

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

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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 1.0nm]n (t=0.4, 0.6, 0.8, 1.0 and 1.2nm; 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 7.7×106Jm-3 and a saturation magnetization as low as 200emucm-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 = "Interfacial magnetism, Magnetic domains and domain walls, Magnetic multilayer, Magnetization reversal, Perpendicular magnetic anisotropy",

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

year = "2014",

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

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

AU - Ngo, Duc The

AU - Quach, Duy Truong

AU - Tran, Quang Hung

AU - Møhave, Kristian

AU - Phan, The Long

AU - Kim, Dong Hyun

PY - 2014/11/5

Y1 - 2014/11/5

N2 - The perpendicular magnetic anisotropy (PMA) and dynamic magnetization-reversal process in [CoFeB t nm/Pd 1.0nm]n (t=0.4, 0.6, 0.8, 1.0 and 1.2nm; 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 7.7×106Jm-3 and a saturation magnetization as low as 200emucm-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 1.0nm]n (t=0.4, 0.6, 0.8, 1.0 and 1.2nm; 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 7.7×106Jm-3 and a saturation magnetization as low as 200emucm-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 - Interfacial magnetism

KW - Magnetic domains and domain walls

KW - Magnetic multilayer

KW - Magnetization reversal

KW - Perpendicular magnetic anisotropy

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JO - Journal of Physics D: Applied Physics

JF - Journal of Physics D: Applied Physics

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M1 - 445001

ER -

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

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Keywords

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