Microstructures and magnetism of different oxides separating FePt grains via ion-beam bombardment and annealing

An Cheng Sun; Hsun Feng Hsu; Yi Jing Wu; Yi Lun Chiu; Jen Hwa Hsu; Philip W.T. Pong; Takao Suzuki; Ko Wei Lin

doi:10.1143/JJAP.49.123001

Microstructures and magnetism of different oxides separating FePt grains via ion-beam bombardment and annealing

An Cheng Sun, Hsun Feng Hsu, Yi Jing Wu, Yi Lun Chiu, Jen Hwa Hsu, Philip W.T. Pong, Takao Suzuki, Ko Wei Lin

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

3 Scopus citations

Abstract

The effects of the fabrication methods and different capped oxide (SiO ₂ and TiO₂) layers on the microstructure and magnetism of FePt thin films were studied. Both structural ordering (S ∼ 0:7) from the fcc FePt phase to the fct FePt phase and magnetic hardening were observed in the annealed FePt/SiO₂ thin films with a low substrate rotation speed (S_r=1 rpm). However, only the annealed FePt/SiO₂ thin films prepared with a high S_r (10 rpm) exhibited isolated FePt grains separated by the grain boundary SiO₂, as revealed by transmission electron microscopy and magnetometry. Furthermore, similar results in microstructures and magnetic properties were obtained after replacing the capped layer with TiO₂. However, an enhanced order parameter (S ∼ 0:85) and a smaller FePt grain size (∼6:8 nm), which are promising characteristics for ultrahighdensity magnetic recording, were achieved in the annealed FePt/TiO₂ thin films; however, the annealed FePt/SiO ₂ thin films exhibited a larger grain size (∼15 nm). This indicates that TiO₂ inhibits the grain growth of FePt more effectively than SiO₂.

Original language	English (US)
Article number	123001
Journal	Japanese Journal of Applied Physics
Volume	49
Issue number	12
DOIs	https://doi.org/10.1143/JJAP.49.123001
State	Published - Dec 2010
Externally published	Yes

All Science Journal Classification (ASJC) codes

General Engineering
General Physics and Astronomy

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title = "Microstructures and magnetism of different oxides separating FePt grains via ion-beam bombardment and annealing",

abstract = "The effects of the fabrication methods and different capped oxide (SiO 2 and TiO2) layers on the microstructure and magnetism of FePt thin films were studied. Both structural ordering (S ∼ 0:7) from the fcc FePt phase to the fct FePt phase and magnetic hardening were observed in the annealed FePt/SiO2 thin films with a low substrate rotation speed (Sr=1 rpm). However, only the annealed FePt/SiO2 thin films prepared with a high Sr (10 rpm) exhibited isolated FePt grains separated by the grain boundary SiO2, as revealed by transmission electron microscopy and magnetometry. Furthermore, similar results in microstructures and magnetic properties were obtained after replacing the capped layer with TiO2. However, an enhanced order parameter (S ∼ 0:85) and a smaller FePt grain size (∼6:8 nm), which are promising characteristics for ultrahighdensity magnetic recording, were achieved in the annealed FePt/TiO2 thin films; however, the annealed FePt/SiO 2 thin films exhibited a larger grain size (∼15 nm). This indicates that TiO2 inhibits the grain growth of FePt more effectively than SiO2.",

author = "Sun, {An Cheng} and Hsu, {Hsun Feng} and Wu, {Yi Jing} and Chiu, {Yi Lun} and Hsu, {Jen Hwa} and Pong, {Philip W.T.} and Takao Suzuki and Lin, {Ko Wei}",

year = "2010",

month = dec,

doi = "10.1143/JJAP.49.123001",

language = "English (US)",

volume = "49",

journal = "Japanese Journal of Applied Physics",

issn = "0021-4922",

publisher = "Japan Society of Applied Physics",

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T1 - Microstructures and magnetism of different oxides separating FePt grains via ion-beam bombardment and annealing

AU - Sun, An Cheng

AU - Hsu, Hsun Feng

AU - Wu, Yi Jing

AU - Chiu, Yi Lun

AU - Hsu, Jen Hwa

AU - Pong, Philip W.T.

AU - Suzuki, Takao

AU - Lin, Ko Wei

PY - 2010/12

Y1 - 2010/12

N2 - The effects of the fabrication methods and different capped oxide (SiO 2 and TiO2) layers on the microstructure and magnetism of FePt thin films were studied. Both structural ordering (S ∼ 0:7) from the fcc FePt phase to the fct FePt phase and magnetic hardening were observed in the annealed FePt/SiO2 thin films with a low substrate rotation speed (Sr=1 rpm). However, only the annealed FePt/SiO2 thin films prepared with a high Sr (10 rpm) exhibited isolated FePt grains separated by the grain boundary SiO2, as revealed by transmission electron microscopy and magnetometry. Furthermore, similar results in microstructures and magnetic properties were obtained after replacing the capped layer with TiO2. However, an enhanced order parameter (S ∼ 0:85) and a smaller FePt grain size (∼6:8 nm), which are promising characteristics for ultrahighdensity magnetic recording, were achieved in the annealed FePt/TiO2 thin films; however, the annealed FePt/SiO 2 thin films exhibited a larger grain size (∼15 nm). This indicates that TiO2 inhibits the grain growth of FePt more effectively than SiO2.

AB - The effects of the fabrication methods and different capped oxide (SiO 2 and TiO2) layers on the microstructure and magnetism of FePt thin films were studied. Both structural ordering (S ∼ 0:7) from the fcc FePt phase to the fct FePt phase and magnetic hardening were observed in the annealed FePt/SiO2 thin films with a low substrate rotation speed (Sr=1 rpm). However, only the annealed FePt/SiO2 thin films prepared with a high Sr (10 rpm) exhibited isolated FePt grains separated by the grain boundary SiO2, as revealed by transmission electron microscopy and magnetometry. Furthermore, similar results in microstructures and magnetic properties were obtained after replacing the capped layer with TiO2. However, an enhanced order parameter (S ∼ 0:85) and a smaller FePt grain size (∼6:8 nm), which are promising characteristics for ultrahighdensity magnetic recording, were achieved in the annealed FePt/TiO2 thin films; however, the annealed FePt/SiO 2 thin films exhibited a larger grain size (∼15 nm). This indicates that TiO2 inhibits the grain growth of FePt more effectively than SiO2.

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Microstructures and magnetism of different oxides separating FePt grains via ion-beam bombardment and annealing

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