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Synthesis and magnetic properties of the thin film exchange spring system of MnBi/FeCo

Sabet, S. and Hildebrandt, E. and Alff, L. (2017):
Synthesis and magnetic properties of the thin film exchange spring system of MnBi/FeCo.
In: Journal of Physics: Conference Series, IOP Publishing Ltd, pp. 012032, 903, ISSN 1742-6588,
DOI: 10.1088/1742-6596/903/1/012032,
[Online-Edition: https://doi.org/10.1088/1742-6596/903/1/012032],
[Article]

Abstract

Manganese bismuth thin films with a nominal thickness of ~40 nm were grown at room temperature onto quartz glass substrate in a DC magnetron sputtering unit. In contrast to the usual multilayer approach, the MnBi films were deposited using a single sputtering target with a stoichiometry of Mn55Bi45 (at. %). A subsequent in-situ annealing step was performed in vacuum in order to form the ferromagnetic LTP of MnBi. X-ray diffraction confirmed the formation of a textured LTP MnBi hard phase after annealing at 330 °C. This film shows a maximum saturation magnetization of 530 emu/cm3, high out-of-plane coercivity of 15 kOe induced by unreacted bismuth. The exchange coupling effect was investigated by deposition of a second layer of FeCo with 1 nm and 2 nm thickness onto the LTP MnBi films. The MnBi/FeCo double layer showed as expected higher saturation magnetization with increasing thickness of the FeCo layer while the coercive field remained constant. The fabrication of the MnBi/FeCo double layer for an exchange spring magnet was facilitated by deposition from a single stoichiometric target.

Item Type: Article
Erschienen: 2017
Creators: Sabet, S. and Hildebrandt, E. and Alff, L.
Title: Synthesis and magnetic properties of the thin film exchange spring system of MnBi/FeCo
Language: English
Abstract:

Manganese bismuth thin films with a nominal thickness of ~40 nm were grown at room temperature onto quartz glass substrate in a DC magnetron sputtering unit. In contrast to the usual multilayer approach, the MnBi films were deposited using a single sputtering target with a stoichiometry of Mn55Bi45 (at. %). A subsequent in-situ annealing step was performed in vacuum in order to form the ferromagnetic LTP of MnBi. X-ray diffraction confirmed the formation of a textured LTP MnBi hard phase after annealing at 330 °C. This film shows a maximum saturation magnetization of 530 emu/cm3, high out-of-plane coercivity of 15 kOe induced by unreacted bismuth. The exchange coupling effect was investigated by deposition of a second layer of FeCo with 1 nm and 2 nm thickness onto the LTP MnBi films. The MnBi/FeCo double layer showed as expected higher saturation magnetization with increasing thickness of the FeCo layer while the coercive field remained constant. The fabrication of the MnBi/FeCo double layer for an exchange spring magnet was facilitated by deposition from a single stoichiometric target.

Journal or Publication Title: Journal of Physics: Conference Series
Volume: 903
Publisher: IOP Publishing Ltd
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 11 Dec 2017 11:29
DOI: 10.1088/1742-6596/903/1/012032
Official URL: https://doi.org/10.1088/1742-6596/903/1/012032
Additional Information:

8th Joint European Magnetic Symposia (JEMS2016)

Funders: The authors thank the LOEWE project RESPONSE funded by the Ministry of Higher Education, Research and Arts (HMWK) of the state of Hessen.
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