Magnetic properties and microstructure of FePt-M-B(M{double bond, short}Zr, Nb, La) films

H. Okumura; S. Nishinakagawa; T. Bitoh; A. Makino; K. Sato; Y. Hirotsu

doi:10.1016/j.jmmm.2006.11.138

Magnetic properties and microstructure of FePt-M-B(M{double bond, short}Zr, Nb, La) films

H. Okumura, S. Nishinakagawa, T. Bitoh, A. Makino, K. Sato, Y. Hirotsu

New Industry Creation Hatchery Center (NICHe)

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

4 Citations (Scopus)

Abstract

We investigated the compositional dependence of microstructure and the coercivity of FePt-M-B(M{double bond, short}Zr, Nb, La) sputter-deposited films. As-deposited ternary FePt-B films have an amorphous structure and low coercivity. After annealing at 923 K for 1.8 ks, ordered L1₀ FePt nanoparticles were observed. With the adding of the fourth element of M(Zr, Nb, La), the as-deposited films were also of the amorphous structure. After annealing at the same condition, the films show high coercivity of ∼520 kA/m and ordered L1₀ FePt phase are found. Compared with the ternary FePt-B films, the structure, coercivity and grain size vary with the additional element (M) and the compositions. The effects of additive elements on transformation to the L1₀-ordered phase have been studied.

Original language	English
Pages (from-to)	2527-2528
Number of pages	2
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 3
DOIs	https://doi.org/10.1016/j.jmmm.2006.11.138
Publication status	Published - 2007 Mar

Keywords

Granular film
L1 ordering
Sputtering

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Magnetic properties and microstructure of FePt-M-B(M{double bond, short}Zr, Nb, La) films",

abstract = "We investigated the compositional dependence of microstructure and the coercivity of FePt-M-B(M{double bond, short}Zr, Nb, La) sputter-deposited films. As-deposited ternary FePt-B films have an amorphous structure and low coercivity. After annealing at 923 K for 1.8 ks, ordered L10 FePt nanoparticles were observed. With the adding of the fourth element of M(Zr, Nb, La), the as-deposited films were also of the amorphous structure. After annealing at the same condition, the films show high coercivity of ∼520 kA/m and ordered L10 FePt phase are found. Compared with the ternary FePt-B films, the structure, coercivity and grain size vary with the additional element (M) and the compositions. The effects of additive elements on transformation to the L10-ordered phase have been studied.",

keywords = "Granular film, L1 ordering, Sputtering",

author = "H. Okumura and S. Nishinakagawa and T. Bitoh and A. Makino and K. Sato and Y. Hirotsu",

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T1 - Magnetic properties and microstructure of FePt-M-B(M{double bond, short}Zr, Nb, La) films

AU - Okumura, H.

AU - Nishinakagawa, S.

AU - Bitoh, T.

AU - Makino, A.

AU - Sato, K.

AU - Hirotsu, Y.

PY - 2007/3

Y1 - 2007/3

N2 - We investigated the compositional dependence of microstructure and the coercivity of FePt-M-B(M{double bond, short}Zr, Nb, La) sputter-deposited films. As-deposited ternary FePt-B films have an amorphous structure and low coercivity. After annealing at 923 K for 1.8 ks, ordered L10 FePt nanoparticles were observed. With the adding of the fourth element of M(Zr, Nb, La), the as-deposited films were also of the amorphous structure. After annealing at the same condition, the films show high coercivity of ∼520 kA/m and ordered L10 FePt phase are found. Compared with the ternary FePt-B films, the structure, coercivity and grain size vary with the additional element (M) and the compositions. The effects of additive elements on transformation to the L10-ordered phase have been studied.

AB - We investigated the compositional dependence of microstructure and the coercivity of FePt-M-B(M{double bond, short}Zr, Nb, La) sputter-deposited films. As-deposited ternary FePt-B films have an amorphous structure and low coercivity. After annealing at 923 K for 1.8 ks, ordered L10 FePt nanoparticles were observed. With the adding of the fourth element of M(Zr, Nb, La), the as-deposited films were also of the amorphous structure. After annealing at the same condition, the films show high coercivity of ∼520 kA/m and ordered L10 FePt phase are found. Compared with the ternary FePt-B films, the structure, coercivity and grain size vary with the additional element (M) and the compositions. The effects of additive elements on transformation to the L10-ordered phase have been studied.

KW - Granular film

KW - L1 ordering

KW - Sputtering

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JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

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IS - 2 SUPPL. PART 3

ER -

Magnetic properties and microstructure of FePt-M-B(M{double bond, short}Zr, Nb, La) films

Abstract

Keywords

ASJC Scopus subject areas

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