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Evolution of Magnetic Anisotropy With Sm Contents in Sm-Co Thin Films

Sharma, Shalini and Radulov, Iliya and Marton, Major and Alff, Lambert (2018):
Evolution of Magnetic Anisotropy With Sm Contents in Sm-Co Thin Films.
In: IEEE Transactions on Magnetics, IEEE Publications, pp. 1-5, (99), ISSN 0018-9464, DOI: 10.1109/TMAG.2018.2837006, [Online-Edition: https://doi.org/10.1109/TMAG.2018.2837006],
[Article]

Abstract

In this paper, the evolution of magnetic anisotropy as a function of Sm contents in buffer-free Sm-Co thin films grown by molecular beam epitaxy is investigated. From the soft magnetic Sm₂Co₁₇ phase, the anisotropy evolves to the hard magnetic SmCo₅ phase with a distinct perpendicular anisotropy and a maximum magnetic anisotropy energy of 1.67 MJ/m³ as measured by torque magnetometry at 300 K. For SmCo₅, a saturation magnetization of 845 emu/cm³, close to the bulk single crystal value is achieved, while a squareness ratio close to unity is measured in the hysteresis curve perpendicular to the film plane. Previously grown YCo₅ and CeCo₅ thin films with perpendicular anisotropy show a considerably reduced uniaxial anisotropy as well as a reduced squareness ratio as compared to SmCo₅. These results demonstrate that the magnetic parameters of rare earth-cobalt thin films can be adapted according to the requirements of applications such as magnetic recording.

Item Type: Article
Erschienen: 2018
Creators: Sharma, Shalini and Radulov, Iliya and Marton, Major and Alff, Lambert
Title: Evolution of Magnetic Anisotropy With Sm Contents in Sm-Co Thin Films
Language: English
Abstract:

In this paper, the evolution of magnetic anisotropy as a function of Sm contents in buffer-free Sm-Co thin films grown by molecular beam epitaxy is investigated. From the soft magnetic Sm₂Co₁₇ phase, the anisotropy evolves to the hard magnetic SmCo₅ phase with a distinct perpendicular anisotropy and a maximum magnetic anisotropy energy of 1.67 MJ/m³ as measured by torque magnetometry at 300 K. For SmCo₅, a saturation magnetization of 845 emu/cm³, close to the bulk single crystal value is achieved, while a squareness ratio close to unity is measured in the hysteresis curve perpendicular to the film plane. Previously grown YCo₅ and CeCo₅ thin films with perpendicular anisotropy show a considerably reduced uniaxial anisotropy as well as a reduced squareness ratio as compared to SmCo₅. These results demonstrate that the magnetic parameters of rare earth-cobalt thin films can be adapted according to the requirements of applications such as magnetic recording.

Journal or Publication Title: IEEE Transactions on Magnetics
Number: 99
Publisher: IEEE Publications
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science > Functional Materials
Date Deposited: 26 Jun 2018 12:27
DOI: 10.1109/TMAG.2018.2837006
Official URL: https://doi.org/10.1109/TMAG.2018.2837006
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