Enhanced structural and magnetic ordering of FePt/Mn-oxide bilayers by ion-beam bombardment and annealing

An Cheng Sun; H. F. Hsu; H. J. Wu; J. H. Hsu; P. W.T. Pong; T. Suzuki; K. W. Lin

doi:10.1109/TMAG.2010.2099111

Enhanced structural and magnetic ordering of FePt/Mn-oxide bilayers by ion-beam bombardment and annealing

An Cheng Sun, H. F. Hsu, H. J. Wu, J. H. Hsu, P. W.T. Pong, T. Suzuki, K. W. Lin

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

8 Scopus citations

Abstract

Structural and magnetic properties of FePt thin films were affected strongly by capped MnO_x layers prepared by ion-beam bombardment and post-annealing. As-deposited FePt/MnO_x bilayer exhibited a magnetically soft fcc phase, and it turned to an ordered fct FePt phase with large coercivity (∼8 kOe) after annealing at 550°C. Increasing the %O₂/Ar in capped MnO_x layer during deposition resulted in smaller ordered FePt grains separated by grain boundaries of MnO_x. We found that the superlattice (001) peak is broadened considerably with larger amount of MnO_x incorporated into FePt, likely due to the hindered formation of hard phase. Our results indicate that FePt/MnO_x films deposited with lower %O₂/Ar, the oxygen atoms may occupy the interstitial positions in the FePt lattice to induce a local strain thus enhancing the FePt ordering. Further increased %O₂/Ar in capped MnO_x layer, the excess oxygen atoms act a diffusion barrier effectively to inhibit the FePt grain growth and ordering.

Original language	English (US)
Article number	5721867
Pages (from-to)	501-504
Number of pages	4
Journal	IEEE Transactions on Magnetics
Volume	47
Issue number	3
DOIs	https://doi.org/10.1109/TMAG.2010.2099111
State	Published - Mar 2011
Externally published	Yes

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Electrical and Electronic Engineering

Keywords

FePt
ion-beam bombardment
magnetic films
phase transformation

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title = "Enhanced structural and magnetic ordering of FePt/Mn-oxide bilayers by ion-beam bombardment and annealing",

abstract = "Structural and magnetic properties of FePt thin films were affected strongly by capped MnOx layers prepared by ion-beam bombardment and post-annealing. As-deposited FePt/MnOx bilayer exhibited a magnetically soft fcc phase, and it turned to an ordered fct FePt phase with large coercivity (∼8 kOe) after annealing at 550°C. Increasing the %O2/Ar in capped MnOx layer during deposition resulted in smaller ordered FePt grains separated by grain boundaries of MnOx. We found that the superlattice (001) peak is broadened considerably with larger amount of MnOx incorporated into FePt, likely due to the hindered formation of hard phase. Our results indicate that FePt/MnOx films deposited with lower %O2/Ar, the oxygen atoms may occupy the interstitial positions in the FePt lattice to induce a local strain thus enhancing the FePt ordering. Further increased %O2/Ar in capped MnOx layer, the excess oxygen atoms act a diffusion barrier effectively to inhibit the FePt grain growth and ordering.",

keywords = "FePt, ion-beam bombardment, magnetic films, phase transformation",

author = "Sun, {An Cheng} and Hsu, {H. F.} and Wu, {H. J.} and Hsu, {J. H.} and Pong, {P. W.T.} and T. Suzuki and Lin, {K. W.}",

year = "2011",

month = mar,

doi = "10.1109/TMAG.2010.2099111",

language = "English (US)",

volume = "47",

pages = "501--504",

journal = "IEEE Transactions on Magnetics",

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T1 - Enhanced structural and magnetic ordering of FePt/Mn-oxide bilayers by ion-beam bombardment and annealing

AU - Sun, An Cheng

AU - Hsu, H. F.

AU - Wu, H. J.

AU - Hsu, J. H.

AU - Pong, P. W.T.

AU - Suzuki, T.

AU - Lin, K. W.

PY - 2011/3

Y1 - 2011/3

N2 - Structural and magnetic properties of FePt thin films were affected strongly by capped MnOx layers prepared by ion-beam bombardment and post-annealing. As-deposited FePt/MnOx bilayer exhibited a magnetically soft fcc phase, and it turned to an ordered fct FePt phase with large coercivity (∼8 kOe) after annealing at 550°C. Increasing the %O2/Ar in capped MnOx layer during deposition resulted in smaller ordered FePt grains separated by grain boundaries of MnOx. We found that the superlattice (001) peak is broadened considerably with larger amount of MnOx incorporated into FePt, likely due to the hindered formation of hard phase. Our results indicate that FePt/MnOx films deposited with lower %O2/Ar, the oxygen atoms may occupy the interstitial positions in the FePt lattice to induce a local strain thus enhancing the FePt ordering. Further increased %O2/Ar in capped MnOx layer, the excess oxygen atoms act a diffusion barrier effectively to inhibit the FePt grain growth and ordering.

AB - Structural and magnetic properties of FePt thin films were affected strongly by capped MnOx layers prepared by ion-beam bombardment and post-annealing. As-deposited FePt/MnOx bilayer exhibited a magnetically soft fcc phase, and it turned to an ordered fct FePt phase with large coercivity (∼8 kOe) after annealing at 550°C. Increasing the %O2/Ar in capped MnOx layer during deposition resulted in smaller ordered FePt grains separated by grain boundaries of MnOx. We found that the superlattice (001) peak is broadened considerably with larger amount of MnOx incorporated into FePt, likely due to the hindered formation of hard phase. Our results indicate that FePt/MnOx films deposited with lower %O2/Ar, the oxygen atoms may occupy the interstitial positions in the FePt lattice to induce a local strain thus enhancing the FePt ordering. Further increased %O2/Ar in capped MnOx layer, the excess oxygen atoms act a diffusion barrier effectively to inhibit the FePt grain growth and ordering.

KW - FePt

KW - ion-beam bombardment

KW - magnetic films

KW - phase transformation

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Enhanced structural and magnetic ordering of FePt/Mn-oxide bilayers by ion-beam bombardment and annealing

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