Fe-Ta-C soft underlayer for double-layered perpendicular recording media

A. Perumal; Y. K. Takahashi; K. Hono

doi:10.1063/1.3058613

Fe-Ta-C soft underlayer for double-layered perpendicular recording media

A. Perumal^*, Y. K. Takahashi, K. Hono

^*Corresponding author for this work

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

11 Citations (Scopus)

Abstract

We report the investigation of microstructure, magnetic domain structure, and magnetic properties of Fe-Ta-C thin films for the application of soft underlayer (SUL) of perpendicular magnetic recording (PMR) media. As-deposited Fe80 Ta8 C12 film showed an amorphous structure with low saturation magnetization (MS ∼600 emucc) and high coercivity (HC ∼18 Oe), while the optimally annealed (≤500 °C) films exhibited high value of MS (∼1350 emucc) and low HC (∼0.3 Oe). The magnetic domain structures and their correlation with the microstructures suggest that the refinement of the average α-Fe grain size below 15 nm and the magnetic properties of the intergranular residual amorphous matrix are very important in obtaining improved soft magnetic properties. These results indicate that Fe-Ta-C films would be a suitable candidate for SUL of FePt PMR media, for which the annealing for L 10 ordering is essential.

Original language	English
Article number	07A304
Journal	Journal of Applied Physics
Volume	105
Issue number	7
DOIs	https://doi.org/10.1063/1.3058613
Publication status	Published - 2009
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Fe-Ta-C soft underlayer for double-layered perpendicular recording media",

abstract = "We report the investigation of microstructure, magnetic domain structure, and magnetic properties of Fe-Ta-C thin films for the application of soft underlayer (SUL) of perpendicular magnetic recording (PMR) media. As-deposited Fe80 Ta8 C12 film showed an amorphous structure with low saturation magnetization (MS ∼600 emucc) and high coercivity (HC ∼18 Oe), while the optimally annealed (≤500 °C) films exhibited high value of MS (∼1350 emucc) and low HC (∼0.3 Oe). The magnetic domain structures and their correlation with the microstructures suggest that the refinement of the average α-Fe grain size below 15 nm and the magnetic properties of the intergranular residual amorphous matrix are very important in obtaining improved soft magnetic properties. These results indicate that Fe-Ta-C films would be a suitable candidate for SUL of FePt PMR media, for which the annealing for L 10 ordering is essential.",

author = "A. Perumal and Takahashi, {Y. K.} and K. Hono",

note = "Funding Information: One of the authors (A.P) acknowledges financial support from the Japan Society for the Promotion of Science (JSPS) in the form of a JSPS postdoctoral fellowship. This work was in part supported by the World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitronics, Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.",

year = "2009",

doi = "10.1063/1.3058613",

language = "English",

volume = "105",

journal = "Journal of Applied Physics",

issn = "0021-8979",

publisher = "American Institute of Physics Publising LLC",

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AU - Perumal, A.

AU - Takahashi, Y. K.

AU - Hono, K.

N1 - Funding Information: One of the authors (A.P) acknowledges financial support from the Japan Society for the Promotion of Science (JSPS) in the form of a JSPS postdoctoral fellowship. This work was in part supported by the World Premier International Research Center Initiative (WPI Initiative) on Materials Nanoarchitronics, Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

PY - 2009

Y1 - 2009

N2 - We report the investigation of microstructure, magnetic domain structure, and magnetic properties of Fe-Ta-C thin films for the application of soft underlayer (SUL) of perpendicular magnetic recording (PMR) media. As-deposited Fe80 Ta8 C12 film showed an amorphous structure with low saturation magnetization (MS ∼600 emucc) and high coercivity (HC ∼18 Oe), while the optimally annealed (≤500 °C) films exhibited high value of MS (∼1350 emucc) and low HC (∼0.3 Oe). The magnetic domain structures and their correlation with the microstructures suggest that the refinement of the average α-Fe grain size below 15 nm and the magnetic properties of the intergranular residual amorphous matrix are very important in obtaining improved soft magnetic properties. These results indicate that Fe-Ta-C films would be a suitable candidate for SUL of FePt PMR media, for which the annealing for L 10 ordering is essential.

AB - We report the investigation of microstructure, magnetic domain structure, and magnetic properties of Fe-Ta-C thin films for the application of soft underlayer (SUL) of perpendicular magnetic recording (PMR) media. As-deposited Fe80 Ta8 C12 film showed an amorphous structure with low saturation magnetization (MS ∼600 emucc) and high coercivity (HC ∼18 Oe), while the optimally annealed (≤500 °C) films exhibited high value of MS (∼1350 emucc) and low HC (∼0.3 Oe). The magnetic domain structures and their correlation with the microstructures suggest that the refinement of the average α-Fe grain size below 15 nm and the magnetic properties of the intergranular residual amorphous matrix are very important in obtaining improved soft magnetic properties. These results indicate that Fe-Ta-C films would be a suitable candidate for SUL of FePt PMR media, for which the annealing for L 10 ordering is essential.

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Fe-Ta-C soft underlayer for double-layered perpendicular recording media

Abstract

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