Effect of annealing temperature on microstructure and magnetism of FePt/TaOxbilayer

Guijun Li; Chi Wah Leung; Ying Ching Chen; Ko Wei Lin; An Cheng Sun; Jen Hwa Hsu; Philip W.T. Pong

doi:10.1016/j.mee.2013.01.028

Effect of annealing temperature on microstructure and magnetism of FePt/TaO_xbilayer

Guijun Li, Chi Wah Leung, Ying Ching Chen, Ko Wei Lin, An Cheng Sun, Jen Hwa Hsu, Philip W.T. Pong

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

6 Citations (Scopus)

Abstract

The effect of annealing temperatures on the microstructures and magnetism of FePt/TaOxbilayers was systemically investigated in the range of 25-650 °C. Microstructural characterization reveals that higher annealing temperatures lead to higher ordering parameters and larger grain sizes. High order parameter up to 0.57 was acquired after the sample was annealed at 600 °C. Diffusion was observed from TaOxlayer into FePt layer after annealing at temperature over 550 °C. The out-of-plane coercivity first increased and exhibited a maximum value up of 4.2 kOe after annealing at 550 °C and decreased as the annealing temperature was further increased. The coercivity increase with higher annealing temperature was attributed to the rise of magnetocrystalline anisotropy due to the formation of the ordered fct FePt structures.

Original language	English
Pages (from-to)	241-245
Number of pages	5
Journal	Microelectronic Engineering
Volume	110
DOIs	https://doi.org/10.1016/j.mee.2013.01.028
Publication status	Published - 1 Jan 2013

Keywords

Annealing temperature
Coercivity
FePt

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Surfaces, Coatings and Films
Electrical and Electronic Engineering

More information

10.1016/j.mee.2013.01.028

Cite this

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title = "Effect of annealing temperature on microstructure and magnetism of FePt/TaOxbilayer",

abstract = "The effect of annealing temperatures on the microstructures and magnetism of FePt/TaOxbilayers was systemically investigated in the range of 25-650 °C. Microstructural characterization reveals that higher annealing temperatures lead to higher ordering parameters and larger grain sizes. High order parameter up to 0.57 was acquired after the sample was annealed at 600 °C. Diffusion was observed from TaOxlayer into FePt layer after annealing at temperature over 550 °C. The out-of-plane coercivity first increased and exhibited a maximum value up of 4.2 kOe after annealing at 550 °C and decreased as the annealing temperature was further increased. The coercivity increase with higher annealing temperature was attributed to the rise of magnetocrystalline anisotropy due to the formation of the ordered fct FePt structures.",

keywords = "Annealing temperature, Coercivity, FePt",

author = "Guijun Li and Leung, {Chi Wah} and Chen, {Ying Ching} and Lin, {Ko Wei} and Sun, {An Cheng} and Hsu, {Jen Hwa} and Pong, {Philip W.T.}",

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T1 - Effect of annealing temperature on microstructure and magnetism of FePt/TaOxbilayer

AU - Li, Guijun

AU - Leung, Chi Wah

AU - Chen, Ying Ching

AU - Lin, Ko Wei

AU - Sun, An Cheng

AU - Hsu, Jen Hwa

AU - Pong, Philip W.T.

PY - 2013/1/1

Y1 - 2013/1/1

N2 - The effect of annealing temperatures on the microstructures and magnetism of FePt/TaOxbilayers was systemically investigated in the range of 25-650 °C. Microstructural characterization reveals that higher annealing temperatures lead to higher ordering parameters and larger grain sizes. High order parameter up to 0.57 was acquired after the sample was annealed at 600 °C. Diffusion was observed from TaOxlayer into FePt layer after annealing at temperature over 550 °C. The out-of-plane coercivity first increased and exhibited a maximum value up of 4.2 kOe after annealing at 550 °C and decreased as the annealing temperature was further increased. The coercivity increase with higher annealing temperature was attributed to the rise of magnetocrystalline anisotropy due to the formation of the ordered fct FePt structures.

AB - The effect of annealing temperatures on the microstructures and magnetism of FePt/TaOxbilayers was systemically investigated in the range of 25-650 °C. Microstructural characterization reveals that higher annealing temperatures lead to higher ordering parameters and larger grain sizes. High order parameter up to 0.57 was acquired after the sample was annealed at 600 °C. Diffusion was observed from TaOxlayer into FePt layer after annealing at temperature over 550 °C. The out-of-plane coercivity first increased and exhibited a maximum value up of 4.2 kOe after annealing at 550 °C and decreased as the annealing temperature was further increased. The coercivity increase with higher annealing temperature was attributed to the rise of magnetocrystalline anisotropy due to the formation of the ordered fct FePt structures.

KW - Annealing temperature

KW - Coercivity

KW - FePt

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DO - 10.1016/j.mee.2013.01.028

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SN - 0167-9317

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EP - 245

JO - Microelectronic Engineering

JF - Microelectronic Engineering

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