Crystal structure as an origin of high-anisotropy field of FeCoB films with Ru underlayer

A. Hashimoto; K. Hirata; T. Matsuu; S. Saito; S. Nakagawa

doi:10.1109/TMAG.2008.2002252

Crystal structure as an origin of high-anisotropy field of FeCoB films with Ru underlayer

A. Hashimoto, K. Hirata, T. Matsuu, S. Saito, S. Nakagawa

ENG - Electronic Engineering

Tokyo Institute of Technology

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

32 Citations (Scopus)

Abstract

The origin of high uniaxial magnetic asnisotropy in FeCoB thin films was investigated by focusing on the changes in FeCo crystal distortion and alignment. The films were prepared by facing targets sputtering using Fe _68.8Co_27.2B₄ alloy targets and examined with X-ray diffraction (XRD) analysis. Preparation of a Ru underlayer showed reduction of coercivity H_c from 130 to 14 Oe and developed remarkably high-anisotropy field H_κ of 500 Oe. FeCo(110) of the FeCoB film with a Ru underlayer revealed an oblique crystal growth and a preferred orientation in the film plane that possessed (110) [110] along the easy axis. FeCo(110) lattice spacing has 0.5% expansion along the easy axis, which induces that the magnetoelastic energy E_elastic of 3.8×10₅ erg/cm₃ exists along the easy axis due to an inverse magnetostriction effect. The estimated H_κ from the.

Original language	English
Pages (from-to)	3899-3901
Number of pages	3
Journal	IEEE Transactions on Magnetics
Volume	44
Issue number	11 PART 2
DOIs	https://doi.org/10.1109/TMAG.2008.2002252
Publication status	Published - 2008 Nov

Keywords

Crystalline texture
FeCoB
High-anisotropy field
Ru
Stress-induced magnetic anisotropy

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10.1109/TMAG.2008.2002252

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title = "Crystal structure as an origin of high-anisotropy field of FeCoB films with Ru underlayer",

abstract = "The origin of high uniaxial magnetic asnisotropy in FeCoB thin films was investigated by focusing on the changes in FeCo crystal distortion and alignment. The films were prepared by facing targets sputtering using Fe 68.8Co27.2B4 alloy targets and examined with X-ray diffraction (XRD) analysis. Preparation of a Ru underlayer showed reduction of coercivity Hc from 130 to 14 Oe and developed remarkably high-anisotropy field Hκ of 500 Oe. FeCo(110) of the FeCoB film with a Ru underlayer revealed an oblique crystal growth and a preferred orientation in the film plane that possessed (110) [110] along the easy axis. FeCo(110) lattice spacing has 0.5% expansion along the easy axis, which induces that the magnetoelastic energy Eelastic of 3.8×105 erg/cm3 exists along the easy axis due to an inverse magnetostriction effect. The estimated Hκ from the.",

keywords = "Crystalline texture, FeCoB, High-anisotropy field, Ru, Stress-induced magnetic anisotropy",

author = "A. Hashimoto and K. Hirata and T. Matsuu and S. Saito and S. Nakagawa",

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T1 - Crystal structure as an origin of high-anisotropy field of FeCoB films with Ru underlayer

AU - Hashimoto, A.

AU - Hirata, K.

AU - Matsuu, T.

AU - Saito, S.

AU - Nakagawa, S.

PY - 2008/11

Y1 - 2008/11

N2 - The origin of high uniaxial magnetic asnisotropy in FeCoB thin films was investigated by focusing on the changes in FeCo crystal distortion and alignment. The films were prepared by facing targets sputtering using Fe 68.8Co27.2B4 alloy targets and examined with X-ray diffraction (XRD) analysis. Preparation of a Ru underlayer showed reduction of coercivity Hc from 130 to 14 Oe and developed remarkably high-anisotropy field Hκ of 500 Oe. FeCo(110) of the FeCoB film with a Ru underlayer revealed an oblique crystal growth and a preferred orientation in the film plane that possessed (110) [110] along the easy axis. FeCo(110) lattice spacing has 0.5% expansion along the easy axis, which induces that the magnetoelastic energy Eelastic of 3.8×105 erg/cm3 exists along the easy axis due to an inverse magnetostriction effect. The estimated Hκ from the.

AB - The origin of high uniaxial magnetic asnisotropy in FeCoB thin films was investigated by focusing on the changes in FeCo crystal distortion and alignment. The films were prepared by facing targets sputtering using Fe 68.8Co27.2B4 alloy targets and examined with X-ray diffraction (XRD) analysis. Preparation of a Ru underlayer showed reduction of coercivity Hc from 130 to 14 Oe and developed remarkably high-anisotropy field Hκ of 500 Oe. FeCo(110) of the FeCoB film with a Ru underlayer revealed an oblique crystal growth and a preferred orientation in the film plane that possessed (110) [110] along the easy axis. FeCo(110) lattice spacing has 0.5% expansion along the easy axis, which induces that the magnetoelastic energy Eelastic of 3.8×105 erg/cm3 exists along the easy axis due to an inverse magnetostriction effect. The estimated Hκ from the.

KW - Crystalline texture

KW - FeCoB

KW - High-anisotropy field

KW - Ru

KW - Stress-induced magnetic anisotropy

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JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 11 PART 2

ER -

Crystal structure as an origin of high-anisotropy field of FeCoB films with Ru underlayer

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Keywords

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