Nanostructure and magnetic properties of L10 FePt:X films

Tom A. George; Zhen Li; Minglang Yan; Yingfan Xu; Ralph Skomski; David J. Sellmyer

doi:10.1063/1.2830556

Nanostructure and magnetic properties of L1₀ FePt:X films

Tom A. George, Zhen Li, Minglang Yan, Yingfan Xu, Ralph Skomski, David J. Sellmyer

Physics and Astronomy

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

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Abstract

Nonepitaxial FePt:X films (X=Cu,Au,CuAu) with tunable magnetic properties are fabricated and investigated. Emphasis is on controlling and adjusting the magnetic properties of high-density perpendicular recording media through exchange decoupling and anisotropy. The films are initially deposited as multilayers with the structure [FePtX]n and have individual thicknesses from about 0.06 to 1.1 nm. To create an (001)-oriented granular L 10 structure, the films are then annealed at temperatures of 600 °C for 5 min and 550 °C for 10 min. The data indicate that Cu enters the L 10 lattice whereas Au segregates at the grain boundaries and reduces the intergranular exchange coupling. For X=CuAu, we obtain coercivities Hc below 10 kOe, and slopes α= (dMdH) Hc of about 1. For X=Cu, we find a favorable reduction in Curie temperature and Hc.

Original language	English (US)
Article number	07D502
Journal	Journal of Applied Physics
Volume	103
Issue number	7
DOIs	https://doi.org/10.1063/1.2830556
State	Published - 2008

ASJC Scopus subject areas

General Physics and Astronomy

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title = "Nanostructure and magnetic properties of L10 FePt:X films",

abstract = "Nonepitaxial FePt:X films (X=Cu,Au,CuAu) with tunable magnetic properties are fabricated and investigated. Emphasis is on controlling and adjusting the magnetic properties of high-density perpendicular recording media through exchange decoupling and anisotropy. The films are initially deposited as multilayers with the structure [FePtX]n and have individual thicknesses from about 0.06 to 1.1 nm. To create an (001)-oriented granular L 10 structure, the films are then annealed at temperatures of 600 °C for 5 min and 550 °C for 10 min. The data indicate that Cu enters the L 10 lattice whereas Au segregates at the grain boundaries and reduces the intergranular exchange coupling. For X=CuAu, we obtain coercivities Hc below 10 kOe, and slopes α= (dMdH) Hc of about 1. For X=Cu, we find a favorable reduction in Curie temperature and Hc.",

author = "George, {Tom A.} and Zhen Li and Minglang Yan and Yingfan Xu and Ralph Skomski and Sellmyer, {David J.}",

note = "Funding Information: We are grateful for financial support to NSF-MRSEC (DMR 0213808), INSIC, and NCMN.",

year = "2008",

doi = "10.1063/1.2830556",

language = "English (US)",

volume = "103",

journal = "Journal of Applied Physics",

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publisher = "American Institute of Physics",

number = "7",

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TY - JOUR

T1 - Nanostructure and magnetic properties of L10 FePt:X films

AU - George, Tom A.

AU - Li, Zhen

AU - Yan, Minglang

AU - Xu, Yingfan

AU - Skomski, Ralph

AU - Sellmyer, David J.

N1 - Funding Information: We are grateful for financial support to NSF-MRSEC (DMR 0213808), INSIC, and NCMN.

PY - 2008

Y1 - 2008

N2 - Nonepitaxial FePt:X films (X=Cu,Au,CuAu) with tunable magnetic properties are fabricated and investigated. Emphasis is on controlling and adjusting the magnetic properties of high-density perpendicular recording media through exchange decoupling and anisotropy. The films are initially deposited as multilayers with the structure [FePtX]n and have individual thicknesses from about 0.06 to 1.1 nm. To create an (001)-oriented granular L 10 structure, the films are then annealed at temperatures of 600 °C for 5 min and 550 °C for 10 min. The data indicate that Cu enters the L 10 lattice whereas Au segregates at the grain boundaries and reduces the intergranular exchange coupling. For X=CuAu, we obtain coercivities Hc below 10 kOe, and slopes α= (dMdH) Hc of about 1. For X=Cu, we find a favorable reduction in Curie temperature and Hc.

AB - Nonepitaxial FePt:X films (X=Cu,Au,CuAu) with tunable magnetic properties are fabricated and investigated. Emphasis is on controlling and adjusting the magnetic properties of high-density perpendicular recording media through exchange decoupling and anisotropy. The films are initially deposited as multilayers with the structure [FePtX]n and have individual thicknesses from about 0.06 to 1.1 nm. To create an (001)-oriented granular L 10 structure, the films are then annealed at temperatures of 600 °C for 5 min and 550 °C for 10 min. The data indicate that Cu enters the L 10 lattice whereas Au segregates at the grain boundaries and reduces the intergranular exchange coupling. For X=CuAu, we obtain coercivities Hc below 10 kOe, and slopes α= (dMdH) Hc of about 1. For X=Cu, we find a favorable reduction in Curie temperature and Hc.

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ER -

Nanostructure and magnetic properties of L1₀ FePt:X films

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