Magnetic properties of ultrathin Co/Pt multilayer Hall devices irradiated using focused ion beam

K Wang; Y Huang; Y.Z. Qiu; R.F. Chen; Peter Heard; Simon Bending

doi:10.1016/j.physb.2015.03.024

Magnetic properties of ultrathin Co/Pt multilayer Hall devices irradiated using focused ion beam

K Wang, Y Huang, Y.Z. Qiu, R.F. Chen, Peter Heard, Simon Bending

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Abstract

A ferromagnetic Co/Pt multilayer was lithographically patterned into 10-μm-wide Hall devices. The anisotropy of the fabricated devices was modified using focused ion beam (FIB). Extraordinary Hall effect (EHE) measurements reveal pronounced reduction in nucleation field of the perpendicular loops at room
temperature. At low temperature of 4.2 K reduced remanent ratios in EHE loops were observed, indicating a tilting of easy magnetic axis. The canting magnetization can be explained by an increasing magnetic moment at low temperatures and a reduced anisotropy by irradiation. The aperture angles
were estimated to be in the range of 20–32° at 4.2 K. The aperture angle of the easy cone of magnetization was found to increase with doses at low temperatures.

Original language	English
Pages (from-to)	158-160
Number of pages	3
Journal	Physica B: Condensed Matter
Volume	476
Early online date	27 Mar 2015
DOIs	https://doi.org/10.1016/j.physb.2015.03.024
Publication status	Published - 1 Nov 2015

Keywords

Co/Pt multilayers
Perpendicular magnetic anisotropy (PMA)
Extraordinary Hall effect (EHE)
Hall devices
Ion irradiation

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10.1016/j.physb.2015.03.024

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@article{9651bcff4e864a43bed1973332ec4623,

title = "Magnetic properties of ultrathin Co/Pt multilayer Hall devices irradiated using focused ion beam",

abstract = "A ferromagnetic Co/Pt multilayer was lithographically patterned into 10-μm-wide Hall devices. The anisotropy of the fabricated devices was modified using focused ion beam (FIB). Extraordinary Hall effect (EHE) measurements reveal pronounced reduction in nucleation field of the perpendicular loops at roomtemperature. At low temperature of 4.2 K reduced remanent ratios in EHE loops were observed, indicating a tilting of easy magnetic axis. The canting magnetization can be explained by an increasing magnetic moment at low temperatures and a reduced anisotropy by irradiation. The aperture angleswere estimated to be in the range of 20–32° at 4.2 K. The aperture angle of the easy cone of magnetization was found to increase with doses at low temperatures.",

keywords = "Co/Pt multilayers, Perpendicular magnetic anisotropy (PMA), Extraordinary Hall effect (EHE), Hall devices, Ion irradiation",

author = "K Wang and Y Huang and Y.Z. Qiu and R.F. Chen and Peter Heard and Simon Bending",

year = "2015",

month = nov,

day = "1",

doi = "10.1016/j.physb.2015.03.024",

language = "English",

volume = "476",

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journal = "Physica B: Condensed Matter",

issn = "0921-4526",

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TY - JOUR

T1 - Magnetic properties of ultrathin Co/Pt multilayer Hall devices irradiated using focused ion beam

AU - Wang, K

AU - Huang, Y

AU - Qiu, Y.Z.

AU - Chen, R.F.

AU - Heard, Peter

AU - Bending, Simon

PY - 2015/11/1

Y1 - 2015/11/1

N2 - A ferromagnetic Co/Pt multilayer was lithographically patterned into 10-μm-wide Hall devices. The anisotropy of the fabricated devices was modified using focused ion beam (FIB). Extraordinary Hall effect (EHE) measurements reveal pronounced reduction in nucleation field of the perpendicular loops at roomtemperature. At low temperature of 4.2 K reduced remanent ratios in EHE loops were observed, indicating a tilting of easy magnetic axis. The canting magnetization can be explained by an increasing magnetic moment at low temperatures and a reduced anisotropy by irradiation. The aperture angleswere estimated to be in the range of 20–32° at 4.2 K. The aperture angle of the easy cone of magnetization was found to increase with doses at low temperatures.

AB - A ferromagnetic Co/Pt multilayer was lithographically patterned into 10-μm-wide Hall devices. The anisotropy of the fabricated devices was modified using focused ion beam (FIB). Extraordinary Hall effect (EHE) measurements reveal pronounced reduction in nucleation field of the perpendicular loops at roomtemperature. At low temperature of 4.2 K reduced remanent ratios in EHE loops were observed, indicating a tilting of easy magnetic axis. The canting magnetization can be explained by an increasing magnetic moment at low temperatures and a reduced anisotropy by irradiation. The aperture angleswere estimated to be in the range of 20–32° at 4.2 K. The aperture angle of the easy cone of magnetization was found to increase with doses at low temperatures.

KW - Co/Pt multilayers

KW - Perpendicular magnetic anisotropy (PMA)

KW - Extraordinary Hall effect (EHE)

KW - Hall devices

KW - Ion irradiation

U2 - 10.1016/j.physb.2015.03.024

DO - 10.1016/j.physb.2015.03.024

M3 - Article (Academic Journal)

SN - 0921-4526

VL - 476

SP - 158

EP - 160

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

ER -

Magnetic properties of ultrathin Co/Pt multilayer Hall devices irradiated using focused ion beam

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