Permanent-magnet properties of thermally processed FePt and FePt-Fe multilayer films

Jian Zhou; Ralph Skomski; Xingzhong Li; Wei Tang; George C. Hadjipanayis; David J. Sellmyer

doi:10.1109/TMAG.2002.803109

Permanent-magnet properties of thermally processed FePt and FePt-Fe multilayer films

Jian Zhou, Ralph Skomski, Xingzhong Li, Wei Tang, George C. Hadjipanayis, David J. Sellmyer

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

24 Scopus citations

Abstract

FePt single-layer and FePt-Fe multilayer thin films are prepared by magnetron sputtering. By varying the Pt content, FePt, Fe₃ Pt, or a mixture of FePt and Fe₃ Pt can be obtained in Fe-Pt single layers. In annealed FePt-Fe multilayers, the coercivities decrease with the introduction of Fe layers compared to FePt single layers, while the magnetization increases. The single-phase behavior of the hysteresis loops of FePt-Fe multilayers indicates the existence of exchange coupling in these materials. For one FePt-Fe sample with optimized exchange coupling, the intrinsic properties correspond to an energy product of 19 MGOe. The texture of the magnets is determined by the (111) orientation of the crystallites. This means that the easy magnetization directions of the FePt grains form an angle of 54.7° with the film normal, but are randomly oriented in the film plane. It is analyzed how this easy-axis distribution affects the magnetic hysteresis.

Original language	English (US)
Pages (from-to)	2802-2804
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	38
Issue number	5 I
DOIs	https://doi.org/10.1109/TMAG.2002.803109
State	Published - Sep 2002
Externally published	Yes
Event	2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands Duration: Apr 28 2002 → May 2 2002

Keywords

Annealing
Permanent magnets
Pt-Fe
Texture

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

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10.1109/TMAG.2002.803109

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@article{866bc82a53254018b8f6ce81427faf7a,

title = "Permanent-magnet properties of thermally processed FePt and FePt-Fe multilayer films",

abstract = "FePt single-layer and FePt-Fe multilayer thin films are prepared by magnetron sputtering. By varying the Pt content, FePt, Fe3 Pt, or a mixture of FePt and Fe3 Pt can be obtained in Fe-Pt single layers. In annealed FePt-Fe multilayers, the coercivities decrease with the introduction of Fe layers compared to FePt single layers, while the magnetization increases. The single-phase behavior of the hysteresis loops of FePt-Fe multilayers indicates the existence of exchange coupling in these materials. For one FePt-Fe sample with optimized exchange coupling, the intrinsic properties correspond to an energy product of 19 MGOe. The texture of the magnets is determined by the (111) orientation of the crystallites. This means that the easy magnetization directions of the FePt grains form an angle of 54.7° with the film normal, but are randomly oriented in the film plane. It is analyzed how this easy-axis distribution affects the magnetic hysteresis.",

keywords = "Annealing, Permanent magnets, Pt-Fe, Texture",

author = "Jian Zhou and Ralph Skomski and Xingzhong Li and Wei Tang and Hadjipanayis, {George C.} and Sellmyer, {David J.}",

note = "Funding Information: Manuscript received February 14, 2001. This work was supported by the Department of Energy, by the Air Force Office of Scientific Research, and CMRA.; 2002 International Magnetics Conference (Intermag 2002) ; Conference date: 28-04-2002 Through 02-05-2002",

year = "2002",

month = sep,

doi = "10.1109/TMAG.2002.803109",

language = "English (US)",

volume = "38",

pages = "2802--2804",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "5 I",

}

TY - JOUR

T1 - Permanent-magnet properties of thermally processed FePt and FePt-Fe multilayer films

AU - Zhou, Jian

AU - Skomski, Ralph

AU - Li, Xingzhong

AU - Tang, Wei

AU - Hadjipanayis, George C.

AU - Sellmyer, David J.

N1 - Funding Information: Manuscript received February 14, 2001. This work was supported by the Department of Energy, by the Air Force Office of Scientific Research, and CMRA.

PY - 2002/9

Y1 - 2002/9

N2 - FePt single-layer and FePt-Fe multilayer thin films are prepared by magnetron sputtering. By varying the Pt content, FePt, Fe3 Pt, or a mixture of FePt and Fe3 Pt can be obtained in Fe-Pt single layers. In annealed FePt-Fe multilayers, the coercivities decrease with the introduction of Fe layers compared to FePt single layers, while the magnetization increases. The single-phase behavior of the hysteresis loops of FePt-Fe multilayers indicates the existence of exchange coupling in these materials. For one FePt-Fe sample with optimized exchange coupling, the intrinsic properties correspond to an energy product of 19 MGOe. The texture of the magnets is determined by the (111) orientation of the crystallites. This means that the easy magnetization directions of the FePt grains form an angle of 54.7° with the film normal, but are randomly oriented in the film plane. It is analyzed how this easy-axis distribution affects the magnetic hysteresis.

AB - FePt single-layer and FePt-Fe multilayer thin films are prepared by magnetron sputtering. By varying the Pt content, FePt, Fe3 Pt, or a mixture of FePt and Fe3 Pt can be obtained in Fe-Pt single layers. In annealed FePt-Fe multilayers, the coercivities decrease with the introduction of Fe layers compared to FePt single layers, while the magnetization increases. The single-phase behavior of the hysteresis loops of FePt-Fe multilayers indicates the existence of exchange coupling in these materials. For one FePt-Fe sample with optimized exchange coupling, the intrinsic properties correspond to an energy product of 19 MGOe. The texture of the magnets is determined by the (111) orientation of the crystallites. This means that the easy magnetization directions of the FePt grains form an angle of 54.7° with the film normal, but are randomly oriented in the film plane. It is analyzed how this easy-axis distribution affects the magnetic hysteresis.

KW - Annealing

KW - Permanent magnets

KW - Pt-Fe

KW - Texture

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U2 - 10.1109/TMAG.2002.803109

DO - 10.1109/TMAG.2002.803109

M3 - Conference article

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SN - 0018-9464

VL - 38

SP - 2802

EP - 2804

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 5 I

T2 - 2002 International Magnetics Conference (Intermag 2002)

Y2 - 28 April 2002 through 2 May 2002

ER -

Permanent-magnet properties of thermally processed FePt and FePt-Fe multilayer films

Abstract

Keywords

ASJC Scopus subject areas

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