Effect of oxygen stoichiometry on microstructural and magnetic properties of FePt/TaOxbilayer fabricated by ion-beam-bombardment deposition

G. J. Li; Chi Wah Leung; Y. C. Chen; J. H. Hsu; A. C. Sun; K. W. Lin; Philip W.T. Pong

doi:10.1109/TMAG.2013.2247383

Effect of oxygen stoichiometry on microstructural and magnetic properties of FePt/TaO_xbilayer fabricated by ion-beam-bombardment deposition

G. J. Li, Chi Wah Leung, Y. C. Chen, J. H. Hsu, A. C. Sun, K. W. Lin, Philip W.T. Pong

Research output: Journal article publication › Journal article › Academic research › peer-review

4 Citations (Scopus)

Abstract

The effect of TaOxcapping layer on microstructures and magnetic properties of FePt thin films via annealing was studied. The structural ordering of FePt from face-centered cubic to face-centered tetragonal phases depends strongly on the oxygen contents in the capping TaOxlayer. The role of the TaOxlayer is used to separate the FePt grains, as revealed by TEM. The annealed FePt/TaOx(15%O2/Ar) exhibited the largest out-of-plane coercivity (Hc4.2 kOe) amongst all samples, compared to that (∼2.4 kOe) in the reference FePt layer. At low oxygen content in FePt/TaOxbilayers, the Ta atoms may act as defects to obstruct the FePt ordering whereas at high oxygen contents, the excess oxygen atoms diffuse into the FePt layer and react with Fe to form iron oxides which give rise to the low coercivities, as characterized by the XPS depth profile and binding energy analysis.

Original language	English
Article number	6559126
Pages (from-to)	3310-3313
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	49
Issue number	7
DOIs	https://doi.org/10.1109/TMAG.2013.2247383
Publication status	Published - 2 Aug 2013

Keywords

FePt
ion-beam bombardment
magnetic properties

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

More information

10.1109/TMAG.2013.2247383

Cite this

@article{5f779f23b91048f79090897ce2dd4bb3,

title = "Effect of oxygen stoichiometry on microstructural and magnetic properties of FePt/TaOxbilayer fabricated by ion-beam-bombardment deposition",

abstract = "The effect of TaOxcapping layer on microstructures and magnetic properties of FePt thin films via annealing was studied. The structural ordering of FePt from face-centered cubic to face-centered tetragonal phases depends strongly on the oxygen contents in the capping TaOxlayer. The role of the TaOxlayer is used to separate the FePt grains, as revealed by TEM. The annealed FePt/TaOx(15%O2/Ar) exhibited the largest out-of-plane coercivity (Hc4.2 kOe) amongst all samples, compared to that (∼2.4 kOe) in the reference FePt layer. At low oxygen content in FePt/TaOxbilayers, the Ta atoms may act as defects to obstruct the FePt ordering whereas at high oxygen contents, the excess oxygen atoms diffuse into the FePt layer and react with Fe to form iron oxides which give rise to the low coercivities, as characterized by the XPS depth profile and binding energy analysis.",

keywords = "FePt, ion-beam bombardment, magnetic properties",

author = "Li, {G. J.} and Leung, {Chi Wah} and Chen, {Y. C.} and Hsu, {J. H.} and Sun, {A. C.} and Lin, {K. W.} and Pong, {Philip W.T.}",

year = "2013",

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Effect of oxygen stoichiometry on microstructural and magnetic properties of FePt/TaO_xbilayer fabricated by ion-beam-bombardment deposition. / Li, G. J.; Leung, Chi Wah; Chen, Y. C. et al.
In: IEEE Transactions on Magnetics, Vol. 49, No. 7, 6559126, 02.08.2013, p. 3310-3313.

Research output: Journal article publication › Journal article › Academic research › peer-review

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AU - Li, G. J.

AU - Leung, Chi Wah

AU - Chen, Y. C.

AU - Hsu, J. H.

AU - Sun, A. C.

AU - Lin, K. W.

AU - Pong, Philip W.T.

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N2 - The effect of TaOxcapping layer on microstructures and magnetic properties of FePt thin films via annealing was studied. The structural ordering of FePt from face-centered cubic to face-centered tetragonal phases depends strongly on the oxygen contents in the capping TaOxlayer. The role of the TaOxlayer is used to separate the FePt grains, as revealed by TEM. The annealed FePt/TaOx(15%O2/Ar) exhibited the largest out-of-plane coercivity (Hc4.2 kOe) amongst all samples, compared to that (∼2.4 kOe) in the reference FePt layer. At low oxygen content in FePt/TaOxbilayers, the Ta atoms may act as defects to obstruct the FePt ordering whereas at high oxygen contents, the excess oxygen atoms diffuse into the FePt layer and react with Fe to form iron oxides which give rise to the low coercivities, as characterized by the XPS depth profile and binding energy analysis.

AB - The effect of TaOxcapping layer on microstructures and magnetic properties of FePt thin films via annealing was studied. The structural ordering of FePt from face-centered cubic to face-centered tetragonal phases depends strongly on the oxygen contents in the capping TaOxlayer. The role of the TaOxlayer is used to separate the FePt grains, as revealed by TEM. The annealed FePt/TaOx(15%O2/Ar) exhibited the largest out-of-plane coercivity (Hc4.2 kOe) amongst all samples, compared to that (∼2.4 kOe) in the reference FePt layer. At low oxygen content in FePt/TaOxbilayers, the Ta atoms may act as defects to obstruct the FePt ordering whereas at high oxygen contents, the excess oxygen atoms diffuse into the FePt layer and react with Fe to form iron oxides which give rise to the low coercivities, as characterized by the XPS depth profile and binding energy analysis.

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