Effects of hydrogenation on structure and magnetic properties of Fe/La multilayers

Y. Endo; K. Matsuura; M. Yamamoto; Y. Kamada; A. Itoh; T. Suenobu; S. Fukuzumi

doi:10.1016/j.stam.2003.10.013

Effects of hydrogenation on structure and magnetic properties of Fe/La multilayers

Y. Endo, K. Matsuura, M. Yamamoto, Y. Kamada, A. Itoh, T. Suenobu, S. Fukuzumi

ENG - Electrical Engineering

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

2 Citations (Scopus)

Abstract

We have studied the effects of hydrogenation on structure and magnetic properties of Fe (3.0 nm)/La (tnm) multilayers at the range of La layer thickness (t) from 0.3 to 4.2 nm. The effects of hydrogenation are the following. (a) All multilayers become a well-defined layered structure. (b) The bilayer thickness (Λ) becomes larger by a lattice expansion of only La layer. (c) The saturation magnetization (M_s)_Fe of the multilayers becomes larger. The increment of (M_s)_Fe is caused by the disproportionation of the Fe-La mixing layer to the pure Fe layer at the Fe/La interface. (d) The remanence ratio (M_r/M_s) and the saturation field (H_s) reflecting coupling state between the adjacent Fe layers change with increasing La layer thickness: the coupling state changes from a ferromagnetic (FM) state to a non-coupled (NC) state. This changing manner is the same, but the thickness range of spacer layer for FM coupling expands from 1.5 to 1.8 nm. This expansion of the thickness range is due to the change of interface structure and electronic structure caused by La-hydride formation.

Original language	English
Pages (from-to)	95-100
Number of pages	6
Journal	Science and Technology of Advanced Materials
Volume	5
Issue number	1-2
DOIs	https://doi.org/10.1016/j.stam.2003.10.013
Publication status	Published - 2004 Jan

Keywords

Fe-La mixing layer
Fe/La multilayer
Ferromagnetic coupling
Hydrogenation
Interlayer exchange coupling
La-hydride layer

ASJC Scopus subject areas

Materials Science(all)

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@article{9037e85e190d4447be4010a349fc1568,

title = "Effects of hydrogenation on structure and magnetic properties of Fe/La multilayers",

abstract = "We have studied the effects of hydrogenation on structure and magnetic properties of Fe (3.0 nm)/La (tnm) multilayers at the range of La layer thickness (t) from 0.3 to 4.2 nm. The effects of hydrogenation are the following. (a) All multilayers become a well-defined layered structure. (b) The bilayer thickness (Λ) becomes larger by a lattice expansion of only La layer. (c) The saturation magnetization (Ms)Fe of the multilayers becomes larger. The increment of (Ms)Fe is caused by the disproportionation of the Fe-La mixing layer to the pure Fe layer at the Fe/La interface. (d) The remanence ratio (Mr/Ms) and the saturation field (Hs) reflecting coupling state between the adjacent Fe layers change with increasing La layer thickness: the coupling state changes from a ferromagnetic (FM) state to a non-coupled (NC) state. This changing manner is the same, but the thickness range of spacer layer for FM coupling expands from 1.5 to 1.8 nm. This expansion of the thickness range is due to the change of interface structure and electronic structure caused by La-hydride formation.",

keywords = "Fe-La mixing layer, Fe/La multilayer, Ferromagnetic coupling, Hydrogenation, Interlayer exchange coupling, La-hydride layer",

author = "Y. Endo and K. Matsuura and M. Yamamoto and Y. Kamada and A. Itoh and T. Suenobu and S. Fukuzumi",

note = "Funding Information: This work was partly supported by a Grant-in-Aid for Scientific Research (S) and Encouragement of Young Scientists (B) from the Japanese Ministry of Education, Culture, Sports, Science, and Technology. This work was also partially supported by {\textquoteleft}Priority Assistance od the Formation of Worldwide Renowned Centers of Research—The 21st Century COE program (Project: Center of Excellence for Advanced Structural and Functional Materials Design){\textquoteright} from the Japanese Ministry of Education, Culture, Sports, Science, and Technology.",

year = "2004",

month = jan,

doi = "10.1016/j.stam.2003.10.013",

language = "English",

volume = "5",

pages = "95--100",

journal = "Science and Technology of Advanced Materials",

issn = "1468-6996",

publisher = "IOP Publishing Ltd.",

number = "1-2",

}

TY - JOUR

T1 - Effects of hydrogenation on structure and magnetic properties of Fe/La multilayers

AU - Endo, Y.

AU - Matsuura, K.

AU - Yamamoto, M.

AU - Kamada, Y.

AU - Itoh, A.

AU - Suenobu, T.

AU - Fukuzumi, S.

N1 - Funding Information: This work was partly supported by a Grant-in-Aid for Scientific Research (S) and Encouragement of Young Scientists (B) from the Japanese Ministry of Education, Culture, Sports, Science, and Technology. This work was also partially supported by ‘Priority Assistance od the Formation of Worldwide Renowned Centers of Research—The 21st Century COE program (Project: Center of Excellence for Advanced Structural and Functional Materials Design)’ from the Japanese Ministry of Education, Culture, Sports, Science, and Technology.

PY - 2004/1

Y1 - 2004/1

N2 - We have studied the effects of hydrogenation on structure and magnetic properties of Fe (3.0 nm)/La (tnm) multilayers at the range of La layer thickness (t) from 0.3 to 4.2 nm. The effects of hydrogenation are the following. (a) All multilayers become a well-defined layered structure. (b) The bilayer thickness (Λ) becomes larger by a lattice expansion of only La layer. (c) The saturation magnetization (Ms)Fe of the multilayers becomes larger. The increment of (Ms)Fe is caused by the disproportionation of the Fe-La mixing layer to the pure Fe layer at the Fe/La interface. (d) The remanence ratio (Mr/Ms) and the saturation field (Hs) reflecting coupling state between the adjacent Fe layers change with increasing La layer thickness: the coupling state changes from a ferromagnetic (FM) state to a non-coupled (NC) state. This changing manner is the same, but the thickness range of spacer layer for FM coupling expands from 1.5 to 1.8 nm. This expansion of the thickness range is due to the change of interface structure and electronic structure caused by La-hydride formation.

AB - We have studied the effects of hydrogenation on structure and magnetic properties of Fe (3.0 nm)/La (tnm) multilayers at the range of La layer thickness (t) from 0.3 to 4.2 nm. The effects of hydrogenation are the following. (a) All multilayers become a well-defined layered structure. (b) The bilayer thickness (Λ) becomes larger by a lattice expansion of only La layer. (c) The saturation magnetization (Ms)Fe of the multilayers becomes larger. The increment of (Ms)Fe is caused by the disproportionation of the Fe-La mixing layer to the pure Fe layer at the Fe/La interface. (d) The remanence ratio (Mr/Ms) and the saturation field (Hs) reflecting coupling state between the adjacent Fe layers change with increasing La layer thickness: the coupling state changes from a ferromagnetic (FM) state to a non-coupled (NC) state. This changing manner is the same, but the thickness range of spacer layer for FM coupling expands from 1.5 to 1.8 nm. This expansion of the thickness range is due to the change of interface structure and electronic structure caused by La-hydride formation.

KW - Fe-La mixing layer

KW - Fe/La multilayer

KW - Ferromagnetic coupling

KW - Hydrogenation

KW - Interlayer exchange coupling

KW - La-hydride layer

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U2 - 10.1016/j.stam.2003.10.013

DO - 10.1016/j.stam.2003.10.013

M3 - Article

AN - SCOPUS:1542611418

VL - 5

SP - 95

EP - 100

JO - Science and Technology of Advanced Materials

JF - Science and Technology of Advanced Materials

SN - 1468-6996

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