Effects of SiO2 addition in FePt on microstructures and magnetic properties on two different MgO substrates

W. B. Byun; K. J. Lee; T. D. Lee

doi:10.1109/TMAG.2009.2018647

Effects of SiO₂ addition in FePt on microstructures and magnetic properties on two different MgO substrates

W. B. Byun, K. J. Lee, T. D. Lee

Department of Materials Science and Engineering

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

1 Citation (Scopus)

Abstract

Ordered FePt film is attractive for its very high perpendicular anisotropy. In the present study, we report different texture formation and mechanisms of ordering FePt films on MgO (100) single crystal (A) substrates and MgO (200) polycrystalline film formed on SiO₂/Si (B) substrates with and without SiO₂ addition. Films with structure of [0.24 nm Pt/0.25 nm Fe/0.21 nm SiO₂]₁₅ were deposited on 600°C substrates and subsequently treated by rapid thermal annealing. In the as-deposited state, FePt grain size was smaller and its degree of ordering was lower on substrate (B) than substrate (A) regardless of SiO₂ addition. Upon annealing, grain growth was more significant on substrate (A) than on substrate (B), and degree of ordering kept nearly constant. However, in the case of SiO₂ addition, upon annealing, grain growth was more significant on substrate (B) than substrate (A), and the ordering parameter increased on both substrates (A) and (B). This indicates ordering reaction is dominated by phase separation of Mg,O or MgO incorporated in FePt grains of the as-deposited states during the short time rapid annealing treatments. Different texture formation and grain size difference in the two different substrates will be discussed together with the mechanism of ordering in FePt films.

Original language	English
Article number	4957790
Pages (from-to)	2705-2708
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	45
Issue number	6
DOIs	https://doi.org/10.1109/TMAG.2009.2018647
Publication status	Published - 2009 Jun

Keywords

FePt
MgO substrates
Ordering mechanism
SiO addition

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Access to Document

10.1109/TMAG.2009.2018647

Cite this

@article{d00a4165ab444df5a0a1883a356deeca,

title = "Effects of SiO2 addition in FePt on microstructures and magnetic properties on two different MgO substrates",

abstract = "Ordered FePt film is attractive for its very high perpendicular anisotropy. In the present study, we report different texture formation and mechanisms of ordering FePt films on MgO (100) single crystal (A) substrates and MgO (200) polycrystalline film formed on SiO2/Si (B) substrates with and without SiO2 addition. Films with structure of [0.24 nm Pt/0.25 nm Fe/0.21 nm SiO2]15 were deposited on 600°C substrates and subsequently treated by rapid thermal annealing. In the as-deposited state, FePt grain size was smaller and its degree of ordering was lower on substrate (B) than substrate (A) regardless of SiO2 addition. Upon annealing, grain growth was more significant on substrate (A) than on substrate (B), and degree of ordering kept nearly constant. However, in the case of SiO2 addition, upon annealing, grain growth was more significant on substrate (B) than substrate (A), and the ordering parameter increased on both substrates (A) and (B). This indicates ordering reaction is dominated by phase separation of Mg,O or MgO incorporated in FePt grains of the as-deposited states during the short time rapid annealing treatments. Different texture formation and grain size difference in the two different substrates will be discussed together with the mechanism of ordering in FePt films.",

keywords = "FePt, MgO substrates, Ordering mechanism, SiO addition",

author = "Byun, {W. B.} and Lee, {K. J.} and Lee, {T. D.}",

note = "Funding Information: This work was supported by a grant from the Tera-level Nano-devices (TND) Frontier Project under the KISTEP.",

year = "2009",

month = jun,

doi = "10.1109/TMAG.2009.2018647",

language = "English",

volume = "45",

pages = "2705--2708",

journal = "IEEE Transactions on Magnetics",

issn = "0018-9464",

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

number = "6",

}

TY - JOUR

T1 - Effects of SiO2 addition in FePt on microstructures and magnetic properties on two different MgO substrates

AU - Byun, W. B.

AU - Lee, K. J.

AU - Lee, T. D.

N1 - Funding Information: This work was supported by a grant from the Tera-level Nano-devices (TND) Frontier Project under the KISTEP.

PY - 2009/6

Y1 - 2009/6

N2 - Ordered FePt film is attractive for its very high perpendicular anisotropy. In the present study, we report different texture formation and mechanisms of ordering FePt films on MgO (100) single crystal (A) substrates and MgO (200) polycrystalline film formed on SiO2/Si (B) substrates with and without SiO2 addition. Films with structure of [0.24 nm Pt/0.25 nm Fe/0.21 nm SiO2]15 were deposited on 600°C substrates and subsequently treated by rapid thermal annealing. In the as-deposited state, FePt grain size was smaller and its degree of ordering was lower on substrate (B) than substrate (A) regardless of SiO2 addition. Upon annealing, grain growth was more significant on substrate (A) than on substrate (B), and degree of ordering kept nearly constant. However, in the case of SiO2 addition, upon annealing, grain growth was more significant on substrate (B) than substrate (A), and the ordering parameter increased on both substrates (A) and (B). This indicates ordering reaction is dominated by phase separation of Mg,O or MgO incorporated in FePt grains of the as-deposited states during the short time rapid annealing treatments. Different texture formation and grain size difference in the two different substrates will be discussed together with the mechanism of ordering in FePt films.

AB - Ordered FePt film is attractive for its very high perpendicular anisotropy. In the present study, we report different texture formation and mechanisms of ordering FePt films on MgO (100) single crystal (A) substrates and MgO (200) polycrystalline film formed on SiO2/Si (B) substrates with and without SiO2 addition. Films with structure of [0.24 nm Pt/0.25 nm Fe/0.21 nm SiO2]15 were deposited on 600°C substrates and subsequently treated by rapid thermal annealing. In the as-deposited state, FePt grain size was smaller and its degree of ordering was lower on substrate (B) than substrate (A) regardless of SiO2 addition. Upon annealing, grain growth was more significant on substrate (A) than on substrate (B), and degree of ordering kept nearly constant. However, in the case of SiO2 addition, upon annealing, grain growth was more significant on substrate (B) than substrate (A), and the ordering parameter increased on both substrates (A) and (B). This indicates ordering reaction is dominated by phase separation of Mg,O or MgO incorporated in FePt grains of the as-deposited states during the short time rapid annealing treatments. Different texture formation and grain size difference in the two different substrates will be discussed together with the mechanism of ordering in FePt films.

KW - FePt

KW - MgO substrates

KW - Ordering mechanism

KW - SiO addition

UR - http://www.scopus.com/inward/record.url?scp=66549095844&partnerID=8YFLogxK

U2 - 10.1109/TMAG.2009.2018647

DO - 10.1109/TMAG.2009.2018647

M3 - Article

AN - SCOPUS:66549095844

SN - 0018-9464

VL - 45

SP - 2705

EP - 2708

JO - IEEE Transactions on Magnetics

JF - IEEE Transactions on Magnetics

IS - 6

M1 - 4957790

ER -