Lowering of L10 phase transition temperature of FePt thin films by single shot H+ ion exposure using plasma focus device

Z. Y. Pan; J. J. Lin; T. Zhang; S. Karamat; T. L. Tan; P. Lee; S. V. Springham; R. V. Ramanujan; R. S. Rawat

doi:10.1016/j.tsf.2008.11.113

Lowering of L1₀ phase transition temperature of FePt thin films by single shot H⁺ ion exposure using plasma focus device

Z. Y. Pan, J. J. Lin, T. Zhang, S. Karamat, T. L. Tan, P. Lee, S. V. Springham, R. V. Ramanujan, R. S. Rawat^*

^*Corresponding author for this work

Nanyang Technological University

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

20 Citations (Scopus)

Abstract

FePt thin films are exposed to pulsed energetic H⁺ ion beam from plasma focus. In irradiated films, the phase transition from the low K_u disordered face-centered-cubic structure to high K_u ordered face-centered-tetragonal phase was achieved at 400 °C with the order parameter S ranging from 0.73 to 0.83, high coercivity of about 5356 kA/m, high negative nucleation field of about 7700 kA/m and high squareness ratio ranging from 0.73 to 0.79. The advantage of using plasma focus device is that it can lower phase transition temperature and significantly enhance the magnetic properties by a pulsed single shot exposure.

Original language	English
Pages (from-to)	2753-2757
Number of pages	5
Journal	Thin Solid Films
Volume	517
Issue number	8
DOIs	https://doi.org/10.1016/j.tsf.2008.11.113
Publication status	Published - Feb 27 2009
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

Keywords

FePt
Magnetic properties
Phase transition
Plasma focus
Pulsed ion irradiation
X-ray diffraction

Access to Document

10.1016/j.tsf.2008.11.113

Cite this

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title = "Lowering of L10 phase transition temperature of FePt thin films by single shot H+ ion exposure using plasma focus device",

abstract = "FePt thin films are exposed to pulsed energetic H+ ion beam from plasma focus. In irradiated films, the phase transition from the low Ku disordered face-centered-cubic structure to high Ku ordered face-centered-tetragonal phase was achieved at 400 °C with the order parameter S ranging from 0.73 to 0.83, high coercivity of about 5356 kA/m, high negative nucleation field of about 7700 kA/m and high squareness ratio ranging from 0.73 to 0.79. The advantage of using plasma focus device is that it can lower phase transition temperature and significantly enhance the magnetic properties by a pulsed single shot exposure.",

keywords = "FePt, Magnetic properties, Phase transition, Plasma focus, Pulsed ion irradiation, X-ray diffraction",

author = "Pan, {Z. Y.} and Lin, {J. J.} and T. Zhang and S. Karamat and Tan, {T. L.} and P. Lee and Springham, {S. V.} and Ramanujan, {R. V.} and Rawat, {R. S.}",

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doi = "10.1016/j.tsf.2008.11.113",

language = "English",

volume = "517",

pages = "2753--2757",

journal = "Thin Solid Films",

issn = "0040-6090",

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T1 - Lowering of L10 phase transition temperature of FePt thin films by single shot H+ ion exposure using plasma focus device

AU - Pan, Z. Y.

AU - Lin, J. J.

AU - Zhang, T.

AU - Karamat, S.

AU - Tan, T. L.

AU - Lee, P.

AU - Springham, S. V.

AU - Ramanujan, R. V.

AU - Rawat, R. S.

PY - 2009/2/27

Y1 - 2009/2/27

N2 - FePt thin films are exposed to pulsed energetic H+ ion beam from plasma focus. In irradiated films, the phase transition from the low Ku disordered face-centered-cubic structure to high Ku ordered face-centered-tetragonal phase was achieved at 400 °C with the order parameter S ranging from 0.73 to 0.83, high coercivity of about 5356 kA/m, high negative nucleation field of about 7700 kA/m and high squareness ratio ranging from 0.73 to 0.79. The advantage of using plasma focus device is that it can lower phase transition temperature and significantly enhance the magnetic properties by a pulsed single shot exposure.

AB - FePt thin films are exposed to pulsed energetic H+ ion beam from plasma focus. In irradiated films, the phase transition from the low Ku disordered face-centered-cubic structure to high Ku ordered face-centered-tetragonal phase was achieved at 400 °C with the order parameter S ranging from 0.73 to 0.83, high coercivity of about 5356 kA/m, high negative nucleation field of about 7700 kA/m and high squareness ratio ranging from 0.73 to 0.79. The advantage of using plasma focus device is that it can lower phase transition temperature and significantly enhance the magnetic properties by a pulsed single shot exposure.

KW - FePt

KW - Magnetic properties

KW - Phase transition

KW - Plasma focus

KW - Pulsed ion irradiation

KW - X-ray diffraction

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